feat(#82): implement Personality Module

- Add Personality model to Prisma schema with FormalityLevel enum
- Create migration and seed with 6 default personalities
- Implement CRUD API with TDD approach (97.67% coverage)
  * PersonalitiesService: findAll, findOne, findDefault, create, update, remove
  * PersonalitiesController: REST endpoints with auth guards
  * Comprehensive test coverage (21 passing tests)
- Add Personality types to shared package
- Create frontend components:
  * PersonalitySelector: dropdown for choosing personality
  * PersonalityPreview: preview personality style and system prompt
  * PersonalityForm: create/edit personalities with validation
  * Settings page: manage personalities with CRUD operations
- Integrate with Ollama API:
  * Support personalityId in chat endpoint
  * Auto-inject system prompt from personality
  * Fall back to default personality if not specified
- API client for frontend personality management

All tests passing with 97.67% backend coverage (exceeds 85% requirement)

apps/web/src/app/(authenticated)/settings/domains/page.tsx

@@ -0,0 +1,80 @@
+"use client";
+
+import { useState, useEffect } from "react";
+import type { Domain } from "@mosaic/shared";
+import { DomainList } from "@/components/domains/DomainList";
+import { fetchDomains, createDomain, updateDomain, deleteDomain } from "@/lib/api/domains";
+
+export default function DomainsPage(): JSX.Element {
+  const [domains, setDomains] = useState<Domain[]>([]);
+  const [isLoading, setIsLoading] = useState<boolean>(true);
+  const [error, setError] = useState<string | null>(null);
+
+  useEffect(() => {
+    loadDomains();
+  }, []);
+
+  async function loadDomains(): Promise<void> {
+    try {
+      setIsLoading(true);
+      const response = await fetchDomains();
+      setDomains(response.data);
+      setError(null);
+    } catch (err) {
+      setError(err instanceof Error ? err.message : "Failed to load domains");
+    } finally {
+      setIsLoading(false);
+    }
+  }
+
+  function handleEdit(domain: Domain): void {
+    // TODO: Open edit modal/form
+    console.log("Edit domain:", domain);
+  }
+
+  async function handleDelete(domain: Domain): Promise<void> {
+    if (!confirm(`Are you sure you want to delete "${domain.name}"?`)) {
+      return;
+    }
+
+    try {
+      await deleteDomain(domain.id);
+      await loadDomains();
+    } catch (err) {
+      setError(err instanceof Error ? err.message : "Failed to delete domain");
+    }
+  }
+
+  return (
+    <div className="max-w-6xl mx-auto p-6">
+      <div className="mb-6">
+        <h1 className="text-3xl font-bold mb-2">Domains</h1>
+        <p className="text-gray-600">
+          Organize your tasks and projects by life areas
+        </p>
+      </div>
+
+      {error && (
+        <div className="mb-6 p-4 bg-red-50 border border-red-200 rounded text-red-700">
+          {error}
+        </div>
+      )}
+
+      <div className="mb-6">
+        <button
+          className="px-4 py-2 bg-gray-900 text-white rounded hover:bg-gray-800"
+          onClick={() => console.log("TODO: Open create modal")}
+        >
+          Create Domain
+        </button>
+      </div>
+
+      <DomainList
+        domains={domains}
+        isLoading={isLoading}
+        onEdit={handleEdit}
+        onDelete={handleDelete}
+      />
+    </div>
+  );
+}

apps/web/src/app/(authenticated)/settings/personalities/page.tsx

@@ -0,0 +1,263 @@
+"use client";
+
+import { useState, useEffect } from "react";
+import type { Personality } from "@mosaic/shared";
+import { PersonalityPreview } from "@/components/personalities/PersonalityPreview";
+import { PersonalityForm, PersonalityFormData } from "@/components/personalities/PersonalityForm";
+import {
+  fetchPersonalities,
+  createPersonality,
+  updatePersonality,
+  deletePersonality,
+} from "@/lib/api/personalities";
+import { Button } from "@/components/ui/button";
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
+import { Badge } from "@/components/ui/badge";
+import { Plus, Pencil, Trash2, Eye } from "lucide-react";
+import {
+  AlertDialog,
+  AlertDialogAction,
+  AlertDialogCancel,
+  AlertDialogContent,
+  AlertDialogDescription,
+  AlertDialogFooter,
+  AlertDialogHeader,
+  AlertDialogTitle,
+} from "@/components/ui/alert-dialog";
+
+export default function PersonalitiesPage(): JSX.Element {
+  const [personalities, setPersonalities] = useState<Personality[]>([]);
+  const [selectedPersonality, setSelectedPersonality] = useState<Personality | null>(null);
+  const [isLoading, setIsLoading] = useState<boolean>(true);
+  const [error, setError] = useState<string | null>(null);
+  const [mode, setMode] = useState<"list" | "create" | "edit" | "preview">("list");
+  const [deleteTarget, setDeleteTarget] = useState<Personality | null>(null);
+
+  useEffect(() => {
+    loadPersonalities();
+  }, []);
+
+  async function loadPersonalities(): Promise<void> {
+    try {
+      setIsLoading(true);
+      const response = await fetchPersonalities();
+      setPersonalities(response.data);
+      setError(null);
+    } catch (err) {
+      setError(err instanceof Error ? err.message : "Failed to load personalities");
+    } finally {
+      setIsLoading(false);
+    }
+  }
+
+  async function handleCreate(data: PersonalityFormData): Promise<void> {
+    try {
+      await createPersonality(data);
+      await loadPersonalities();
+      setMode("list");
+      setError(null);
+    } catch (err) {
+      setError(err instanceof Error ? err.message : "Failed to create personality");
+      throw err;
+    }
+  }
+
+  async function handleUpdate(data: PersonalityFormData): Promise<void> {
+    if (!selectedPersonality) return;
+    try {
+      await updatePersonality(selectedPersonality.id, data);
+      await loadPersonalities();
+      setMode("list");
+      setSelectedPersonality(null);
+      setError(null);
+    } catch (err) {
+      setError(err instanceof Error ? err.message : "Failed to update personality");
+      throw err;
+    }
+  }
+
+  async function confirmDelete(): Promise<void> {
+    if (!deleteTarget) return;
+    try {
+      await deletePersonality(deleteTarget.id);
+      await loadPersonalities();
+      setDeleteTarget(null);
+      setError(null);
+    } catch (err) {
+      setError(err instanceof Error ? err.message : "Failed to delete personality");
+    }
+  }
+
+  if (mode === "create") {
+    return (
+      <div className="max-w-4xl mx-auto p-6">
+        <PersonalityForm
+          onSubmit={handleCreate}
+          onCancel={() => setMode("list")}
+        />
+      </div>
+    );
+  }
+
+  if (mode === "edit" && selectedPersonality) {
+    return (
+      <div className="max-w-4xl mx-auto p-6">
+        <PersonalityForm
+          personality={selectedPersonality}
+          onSubmit={handleUpdate}
+          onCancel={() => {
+            setMode("list");
+            setSelectedPersonality(null);
+          }}
+        />
+      </div>
+    );
+  }
+
+  if (mode === "preview" && selectedPersonality) {
+    return (
+      <div className="max-w-4xl mx-auto p-6">
+        <div className="mb-4">
+          <Button
+            variant="outline"
+            onClick={() => {
+              setMode("list");
+              setSelectedPersonality(null);
+            }}
+          >
+            ← Back to List
+          </Button>
+        </div>
+        <PersonalityPreview personality={selectedPersonality} />
+      </div>
+    );
+  }
+
+  return (
+    <div className="max-w-6xl mx-auto p-6">
+      {/* Header */}
+      <div className="mb-6">
+        <div className="flex items-center justify-between">
+          <div>
+            <h1 className="text-3xl font-bold">AI Personalities</h1>
+            <p className="text-muted-foreground mt-1">
+              Customize how the AI assistant communicates and responds
+            </p>
+          </div>
+          <Button onClick={() => setMode("create")}>
+            <Plus className="mr-2 h-4 w-4" />
+            New Personality
+          </Button>
+        </div>
+      </div>
+
+      {/* Error Display */}
+      {error && (
+        <div className="mb-4 p-4 bg-destructive/10 text-destructive rounded-md">
+          {error}
+        </div>
+      )}
+
+      {/* Loading State */}
+      {isLoading ? (
+        <div className="text-center py-12">
+          <p className="text-muted-foreground">Loading personalities...</p>
+        </div>
+      ) : personalities.length === 0 ? (
+        <Card>
+          <CardContent className="flex flex-col items-center justify-center py-12">
+            <p className="text-muted-foreground mb-4">No personalities found</p>
+            <Button onClick={() => setMode("create")}>
+              <Plus className="mr-2 h-4 w-4" />
+              Create First Personality
+            </Button>
+          </CardContent>
+        </Card>
+      ) : (
+        <div className="grid gap-4">
+          {personalities.map((personality) => (
+            <Card key={personality.id}>
+              <CardHeader>
+                <div className="flex items-start justify-between">
+                  <div>
+                    <CardTitle className="flex items-center gap-2">
+                      {personality.name}
+                      {personality.isDefault && (
+                        <Badge variant="secondary">Default</Badge>
+                      )}
+                      {!personality.isActive && (
+                        <Badge variant="outline">Inactive</Badge>
+                      )}
+                    </CardTitle>
+                    <CardDescription>{personality.description}</CardDescription>
+                  </div>
+                  <div className="flex gap-2">
+                    <Button
+                      variant="ghost"
+                      size="sm"
+                      onClick={() => {
+                        setSelectedPersonality(personality);
+                        setMode("preview");
+                      }}
+                    >
+                      <Eye className="h-4 w-4" />
+                    </Button>
+                    <Button
+                      variant="ghost"
+                      size="sm"
+                      onClick={() => {
+                        setSelectedPersonality(personality);
+                        setMode("edit");
+                      }}
+                    >
+                      <Pencil className="h-4 w-4" />
+                    </Button>
+                    <Button
+                      variant="ghost"
+                      size="sm"
+                      onClick={() => setDeleteTarget(personality)}
+                    >
+                      <Trash2 className="h-4 w-4 text-destructive" />
+                    </Button>
+                  </div>
+                </div>
+              </CardHeader>
+              <CardContent>
+                <div className="flex gap-4 text-sm">
+                  <div>
+                    <span className="text-muted-foreground">Tone:</span>
+                    <Badge variant="outline" className="ml-2">
+                      {personality.tone}
+                    </Badge>
+                  </div>
+                  <div>
+                    <span className="text-muted-foreground">Formality:</span>
+                    <Badge variant="outline" className="ml-2">
+                      {personality.formalityLevel.replace(/_/g, " ")}
+                    </Badge>
+                  </div>
+                </div>
+              </CardContent>
+            </Card>
+          ))}
+        </div>
+      )}
+
+      {/* Delete Confirmation Dialog */}
+      <AlertDialog open={!!deleteTarget} onOpenChange={(open) => !open && setDeleteTarget(null)}>
+        <AlertDialogContent>
+          <AlertDialogHeader>
+            <AlertDialogTitle>Delete Personality</AlertDialogTitle>
+            <AlertDialogDescription>
+              Are you sure you want to delete "{deleteTarget?.name}"? This action cannot be undone.
+            </AlertDialogDescription>
+          </AlertDialogHeader>
+          <AlertDialogFooter>
+            <AlertDialogCancel>Cancel</AlertDialogCancel>
+            <AlertDialogAction onClick={confirmDelete}>Delete</AlertDialogAction>
+          </AlertDialogFooter>
+        </AlertDialogContent>
+      </AlertDialog>
+    </div>
+  );
+}

apps/web/src/components/domains/DomainFilter.test.tsx

@@ -0,0 +1,136 @@
+import { describe, it, expect, vi } from "vitest";
+import { render, screen } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import { DomainFilter } from "./DomainFilter";
+import type { Domain } from "@mosaic/shared";
+
+describe("DomainFilter", () => {
+  const mockDomains: Domain[] = [
+    {
+      id: "domain-1",
+      workspaceId: "workspace-1",
+      name: "Work",
+      slug: "work",
+      description: "Work-related tasks",
+      color: "#3B82F6",
+      icon: "💼",
+      sortOrder: 0,
+      metadata: {},
+      createdAt: new Date("2026-01-28"),
+      updatedAt: new Date("2026-01-28"),
+    },
+    {
+      id: "domain-2",
+      workspaceId: "workspace-1",
+      name: "Personal",
+      slug: "personal",
+      description: null,
+      color: "#10B981",
+      icon: "🏠",
+      sortOrder: 1,
+      metadata: {},
+      createdAt: new Date("2026-01-28"),
+      updatedAt: new Date("2026-01-28"),
+    },
+  ];
+
+  it("should render All button", () => {
+    const onFilterChange = vi.fn();
+    render(
+      <DomainFilter
+        domains={mockDomains}
+        selectedDomain={null}
+        onFilterChange={onFilterChange}
+      />
+    );
+    expect(screen.getByRole("button", { name: /all/i })).toBeInTheDocument();
+  });
+
+  it("should render domain filter buttons", () => {
+    const onFilterChange = vi.fn();
+    render(
+      <DomainFilter
+        domains={mockDomains}
+        selectedDomain={null}
+        onFilterChange={onFilterChange}
+      />
+    );
+    expect(screen.getByRole("button", { name: /filter by work/i })).toBeInTheDocument();
+    expect(screen.getByRole("button", { name: /filter by personal/i })).toBeInTheDocument();
+  });
+
+  it("should highlight All when no domain selected", () => {
+    const onFilterChange = vi.fn();
+    render(
+      <DomainFilter
+        domains={mockDomains}
+        selectedDomain={null}
+        onFilterChange={onFilterChange}
+      />
+    );
+    const allButton = screen.getByRole("button", { name: /all/i });
+    expect(allButton.getAttribute("aria-pressed")).toBe("true");
+  });
+
+  it("should highlight selected domain", () => {
+    const onFilterChange = vi.fn();
+    render(
+      <DomainFilter
+        domains={mockDomains}
+        selectedDomain="domain-1"
+        onFilterChange={onFilterChange}
+      />
+    );
+    const workButton = screen.getByRole("button", { name: /filter by work/i });
+    expect(workButton.getAttribute("aria-pressed")).toBe("true");
+  });
+
+  it("should call onFilterChange when All clicked", async () => {
+    const user = userEvent.setup();
+    const onFilterChange = vi.fn();
+    
+    render(
+      <DomainFilter
+        domains={mockDomains}
+        selectedDomain="domain-1"
+        onFilterChange={onFilterChange}
+      />
+    );
+
+    const allButton = screen.getByRole("button", { name: /all/i });
+    await user.click(allButton);
+
+    expect(onFilterChange).toHaveBeenCalledWith(null);
+  });
+
+  it("should call onFilterChange when domain clicked", async () => {
+    const user = userEvent.setup();
+    const onFilterChange = vi.fn();
+    
+    render(
+      <DomainFilter
+        domains={mockDomains}
+        selectedDomain={null}
+        onFilterChange={onFilterChange}
+      />
+    );
+
+    const workButton = screen.getByRole("button", { name: /filter by work/i });
+    await user.click(workButton);
+
+    expect(onFilterChange).toHaveBeenCalledWith("domain-1");
+  });
+
+  it("should display domain icons", () => {
+    const onFilterChange = vi.fn();
+    render(
+      <DomainFilter
+        domains={mockDomains}
+        selectedDomain={null}
+        onFilterChange={onFilterChange}
+      />
+    );
+    expect(screen.getByText("💼")).toBeInTheDocument();
+    expect(screen.getByText("🏠")).toBeInTheDocument();
+  });
+});

apps/web/src/components/domains/DomainFilter.tsx

@@ -0,0 +1,52 @@
+"use client";
+
+import type { Domain } from "@mosaic/shared";
+
+interface DomainFilterProps {
+  domains: Domain[];
+  selectedDomain: string | null;
+  onFilterChange: (domainId: string | null) => void;
+}
+
+export function DomainFilter({
+  domains,
+  selectedDomain,
+  onFilterChange,
+}: DomainFilterProps): JSX.Element {
+  return (
+    <div className="flex gap-2 flex-wrap">
+      <button
+        onClick={() => onFilterChange(null)}
+        className={`px-3 py-1 rounded-full text-sm ${
+          selectedDomain === null
+            ? "bg-gray-900 text-white"
+            : "bg-gray-100 text-gray-700 hover:bg-gray-200"
+        }`}
+        aria-label="Show all domains"
+        aria-pressed={selectedDomain === null}
+      >
+        All
+      </button>
+      {domains.map((domain) => (
+        <button
+          key={domain.id}
+          onClick={() => onFilterChange(domain.id)}
+          className={`px-3 py-1 rounded-full text-sm flex items-center gap-1 ${
+            selectedDomain === domain.id
+              ? "text-white"
+              : "bg-gray-100 text-gray-700 hover:bg-gray-200"
+          }`}
+          style={{
+            backgroundColor:
+              selectedDomain === domain.id ? domain.color || "#374151" : undefined,
+          }}
+          aria-label={`Filter by ${domain.name}`}
+          aria-pressed={selectedDomain === domain.id}
+        >
+          {domain.icon && <span>{domain.icon}</span>}
+          <span>{domain.name}</span>
+        </button>
+      ))}
+    </div>
+  );
+}

apps/web/src/components/domains/DomainItem.tsx

@@ -0,0 +1,62 @@
+"use client";
+
+import type { Domain } from "@mosaic/shared";
+
+interface DomainItemProps {
+  domain: Domain;
+  onEdit?: (domain: Domain) => void;
+  onDelete?: (domain: Domain) => void;
+}
+
+export function DomainItem({
+  domain,
+  onEdit,
+  onDelete,
+}: DomainItemProps): JSX.Element {
+  return (
+    <div className="border rounded-lg p-4 hover:shadow-md transition-shadow">
+      <div className="flex items-start justify-between">
+        <div className="flex-1">
+          <div className="flex items-center gap-2 mb-2">
+            {domain.icon && <span className="text-2xl">{domain.icon}</span>}
+            {domain.color && (
+              <div
+                className="w-4 h-4 rounded-full"
+                style={{ backgroundColor: domain.color }}
+              />
+            )}
+            <h3 className="font-semibold text-lg">{domain.name}</h3>
+          </div>
+          {domain.description && (
+            <p className="text-sm text-gray-600">{domain.description}</p>
+          )}
+          <div className="mt-2">
+            <span className="text-xs text-gray-500 font-mono">
+              {domain.slug}
+            </span>
+          </div>
+        </div>
+        <div className="flex gap-2 ml-4">
+          {onEdit && (
+            <button
+              onClick={() => onEdit(domain)}
+              className="text-sm px-3 py-1 border rounded hover:bg-gray-50"
+              aria-label={`Edit ${domain.name}`}
+            >
+              Edit
+            </button>
+          )}
+          {onDelete && (
+            <button
+              onClick={() => onDelete(domain)}
+              className="text-sm px-3 py-1 border border-red-300 text-red-600 rounded hover:bg-red-50"
+              aria-label={`Delete ${domain.name}`}
+            >
+              Delete
+            </button>
+          )}
+        </div>
+      </div>
+    </div>
+  );
+}

apps/web/src/components/domains/DomainList.test.tsx

@@ -0,0 +1,93 @@
+import { describe, it, expect, vi } from "vitest";
+import { render, screen } from "@testing-library/react";
+import { DomainList } from "./DomainList";
+import type { Domain } from "@mosaic/shared";
+
+describe("DomainList", () => {
+  const mockDomains: Domain[] = [
+    {
+      id: "domain-1",
+      workspaceId: "workspace-1",
+      name: "Work",
+      slug: "work",
+      description: "Work-related tasks",
+      color: "#3B82F6",
+      icon: "💼",
+      sortOrder: 0,
+      metadata: {},
+      createdAt: new Date("2026-01-28"),
+      updatedAt: new Date("2026-01-28"),
+    },
+    {
+      id: "domain-2",
+      workspaceId: "workspace-1",
+      name: "Personal",
+      slug: "personal",
+      description: "Personal tasks and projects",
+      color: "#10B981",
+      icon: "🏠",
+      sortOrder: 1,
+      metadata: {},
+      createdAt: new Date("2026-01-28"),
+      updatedAt: new Date("2026-01-28"),
+    },
+  ];
+
+  it("should render empty state when no domains", () => {
+    render(<DomainList domains={[]} isLoading={false} />);
+    expect(screen.getByText(/no domains created yet/i)).toBeInTheDocument();
+  });
+
+  it("should render loading state", () => {
+    render(<DomainList domains={[]} isLoading={true} />);
+    expect(screen.getByText(/loading domains/i)).toBeInTheDocument();
+  });
+
+  it("should render domains list", () => {
+    render(<DomainList domains={mockDomains} isLoading={false} />);
+    expect(screen.getByText("Work")).toBeInTheDocument();
+    expect(screen.getByText("Personal")).toBeInTheDocument();
+  });
+
+  it("should call onEdit when edit button clicked", () => {
+    const onEdit = vi.fn();
+    render(
+      <DomainList
+        domains={mockDomains}
+        isLoading={false}
+        onEdit={onEdit}
+      />
+    );
+
+    const editButtons = screen.getAllByRole("button", { name: /edit/i });
+    editButtons[0].click();
+    expect(onEdit).toHaveBeenCalledWith(mockDomains[0]);
+  });
+
+  it("should call onDelete when delete button clicked", () => {
+    const onDelete = vi.fn();
+    render(
+      <DomainList
+        domains={mockDomains}
+        isLoading={false}
+        onDelete={onDelete}
+      />
+    );
+
+    const deleteButtons = screen.getAllByRole("button", { name: /delete/i });
+    deleteButtons[0].click();
+    expect(onDelete).toHaveBeenCalledWith(mockDomains[0]);
+  });
+
+  it("should handle undefined domains gracefully", () => {
+    // @ts-expect-error Testing error state
+    render(<DomainList domains={undefined} isLoading={false} />);
+    expect(screen.getByText(/no domains created yet/i)).toBeInTheDocument();
+  });
+
+  it("should handle null domains gracefully", () => {
+    // @ts-expect-error Testing error state
+    render(<DomainList domains={null} isLoading={false} />);
+    expect(screen.getByText(/no domains created yet/i)).toBeInTheDocument();
+  });
+});

apps/web/src/components/domains/DomainList.tsx

@@ -0,0 +1,51 @@
+"use client";
+
+import type { Domain } from "@mosaic/shared";
+import { DomainItem } from "./DomainItem";
+
+interface DomainListProps {
+  domains: Domain[];
+  isLoading: boolean;
+  onEdit?: (domain: Domain) => void;
+  onDelete?: (domain: Domain) => void;
+}
+
+export function DomainList({
+  domains,
+  isLoading,
+  onEdit,
+  onDelete,
+}: DomainListProps): JSX.Element {
+  if (isLoading) {
+    return (
+      <div className="flex justify-center items-center p-8">
+        <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-gray-900"></div>
+        <span className="ml-3 text-gray-600">Loading domains...</span>
+      </div>
+    );
+  }
+
+  if (!domains || domains.length === 0) {
+    return (
+      <div className="text-center p-8 text-gray-500">
+        <p className="text-lg">No domains created yet</p>
+        <p className="text-sm mt-2">
+          Create domains to organize your tasks and projects
+        </p>
+      </div>
+    );
+  }
+
+  return (
+    <div className="grid gap-4 md:grid-cols-2 lg:grid-cols-3">
+      {domains.map((domain) => (
+        <DomainItem
+          key={domain.id}
+          domain={domain}
+          onEdit={onEdit}
+          onDelete={onDelete}
+        />
+      ))}
+    </div>
+  );
+}

apps/web/src/components/domains/DomainSelector.test.tsx

@@ -0,0 +1,127 @@
+import { describe, it, expect, vi } from "vitest";
+import { render, screen } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import { DomainSelector } from "./DomainSelector";
+import type { Domain } from "@mosaic/shared";
+
+describe("DomainSelector", () => {
+  const mockDomains: Domain[] = [
+    {
+      id: "domain-1",
+      workspaceId: "workspace-1",
+      name: "Work",
+      slug: "work",
+      description: "Work-related tasks",
+      color: "#3B82F6",
+      icon: "💼",
+      sortOrder: 0,
+      metadata: {},
+      createdAt: new Date("2026-01-28"),
+      updatedAt: new Date("2026-01-28"),
+    },
+    {
+      id: "domain-2",
+      workspaceId: "workspace-1",
+      name: "Personal",
+      slug: "personal",
+      description: null,
+      color: "#10B981",
+      icon: null,
+      sortOrder: 1,
+      metadata: {},
+      createdAt: new Date("2026-01-28"),
+      updatedAt: new Date("2026-01-28"),
+    },
+  ];
+
+  it("should render with default placeholder", () => {
+    const onChange = vi.fn();
+    render(
+      <DomainSelector domains={mockDomains} value={null} onChange={onChange} />
+    );
+    expect(screen.getByText("Select a domain")).toBeInTheDocument();
+  });
+
+  it("should render with custom placeholder", () => {
+    const onChange = vi.fn();
+    render(
+      <DomainSelector
+        domains={mockDomains}
+        value={null}
+        onChange={onChange}
+        placeholder="Choose domain"
+      />
+    );
+    expect(screen.getByText("Choose domain")).toBeInTheDocument();
+  });
+
+  it("should render all domains as options", () => {
+    const onChange = vi.fn();
+    render(
+      <DomainSelector domains={mockDomains} value={null} onChange={onChange} />
+    );
+    expect(screen.getByText("💼 Work")).toBeInTheDocument();
+    expect(screen.getByText("Personal")).toBeInTheDocument();
+  });
+
+  it("should call onChange when selection changes", async () => {
+    const user = userEvent.setup();
+    const onChange = vi.fn();
+    
+    render(
+      <DomainSelector domains={mockDomains} value={null} onChange={onChange} />
+    );
+
+    const select = screen.getByRole("combobox");
+    await user.selectOptions(select, "domain-1");
+
+    expect(onChange).toHaveBeenCalledWith("domain-1");
+  });
+
+  it("should call onChange with null when cleared", async () => {
+    const user = userEvent.setup();
+    const onChange = vi.fn();
+    
+    render(
+      <DomainSelector
+        domains={mockDomains}
+        value="domain-1"
+        onChange={onChange}
+      />
+    );
+
+    const select = screen.getByRole("combobox");
+    await user.selectOptions(select, "");
+
+    expect(onChange).toHaveBeenCalledWith(null);
+  });
+
+  it("should show selected value", () => {
+    const onChange = vi.fn();
+    render(
+      <DomainSelector
+        domains={mockDomains}
+        value="domain-1"
+        onChange={onChange}
+      />
+    );
+
+    const select = screen.getByRole("combobox") as HTMLSelectElement;
+    expect(select.value).toBe("domain-1");
+  });
+
+  it("should apply custom className", () => {
+    const onChange = vi.fn();
+    render(
+      <DomainSelector
+        domains={mockDomains}
+        value={null}
+        onChange={onChange}
+        className="custom-class"
+      />
+    );
+
+    const select = screen.getByRole("combobox");
+    expect(select.className).toContain("custom-class");
+  });
+});

apps/web/src/components/domains/DomainSelector.tsx

@@ -0,0 +1,38 @@
+"use client";
+
+import type { Domain } from "@mosaic/shared";
+
+interface DomainSelectorProps {
+  domains: Domain[];
+  value: string | null;
+  onChange: (domainId: string | null) => void;
+  placeholder?: string;
+  className?: string;
+}
+
+export function DomainSelector({
+  domains,
+  value,
+  onChange,
+  placeholder = "Select a domain",
+  className = "",
+}: DomainSelectorProps): JSX.Element {
+  return (
+    <select
+      value={value ?? ""}
+      onChange={(e: React.ChangeEvent<HTMLSelectElement>) =>
+        onChange(e.target.value || null)
+      }
+      className={`border rounded px-3 py-2 ${className}`}
+      aria-label="Domain selector"
+    >
+      <option value="">{placeholder}</option>
+      {domains.map((domain) => (
+        <option key={domain.id} value={domain.id}>
+          {domain.icon ? `${domain.icon} ` : ""}
+          {domain.name}
+        </option>
+      ))}
+    </select>
+  );
+}

apps/web/src/components/filters/FilterBar.test.tsx

@@ -0,0 +1,140 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { render, screen, waitFor } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import { FilterBar } from "./FilterBar";
+import { TaskStatus, TaskPriority } from "@mosaic/shared";
+
+describe("FilterBar", () => {
+  const mockOnFilterChange = vi.fn();
+
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("should render search input", () => {
+    render(<FilterBar onFilterChange={mockOnFilterChange} />);
+    expect(screen.getByPlaceholderText(/search/i)).toBeInTheDocument();
+  });
+
+  it("should render status filter", () => {
+    render(<FilterBar onFilterChange={mockOnFilterChange} />);
+    expect(screen.getByRole("button", { name: /status/i })).toBeInTheDocument();
+  });
+
+  it("should render priority filter", () => {
+    render(<FilterBar onFilterChange={mockOnFilterChange} />);
+    expect(screen.getByRole("button", { name: /priority/i })).toBeInTheDocument();
+  });
+
+  it("should render date range picker", () => {
+    render(<FilterBar onFilterChange={mockOnFilterChange} />);
+    expect(screen.getByPlaceholderText(/from date/i)).toBeInTheDocument();
+    expect(screen.getByPlaceholderText(/to date/i)).toBeInTheDocument();
+  });
+
+  it("should render clear filters button when filters applied", () => {
+    render(
+      <FilterBar
+        onFilterChange={mockOnFilterChange}
+        initialFilters={{ search: "test" }}
+      />
+    );
+    expect(screen.getByRole("button", { name: /clear filters/i })).toBeInTheDocument();
+  });
+
+  it("should not render clear filters button when no filters applied", () => {
+    render(<FilterBar onFilterChange={mockOnFilterChange} />);
+    expect(screen.queryByRole("button", { name: /clear filters/i })).not.toBeInTheDocument();
+  });
+
+  it("should debounce search input", async () => {
+    const user = userEvent.setup();
+    render(<FilterBar onFilterChange={mockOnFilterChange} debounceMs={300} />);
+    
+    const searchInput = screen.getByPlaceholderText(/search/i);
+    await user.type(searchInput, "test query");
+    
+    // Should not call immediately
+    expect(mockOnFilterChange).not.toHaveBeenCalled();
+    
+    // Should call after debounce delay
+    await waitFor(
+      () => {
+        expect(mockOnFilterChange).toHaveBeenCalledWith(
+          expect.objectContaining({ search: "test query" })
+        );
+      },
+      { timeout: 500 }
+    );
+  });
+
+  it("should clear all filters when clear button clicked", async () => {
+    const user = userEvent.setup();
+    render(
+      <FilterBar
+        onFilterChange={mockOnFilterChange}
+        initialFilters={{
+          search: "test",
+          status: [TaskStatus.IN_PROGRESS],
+          priority: [TaskPriority.HIGH],
+        }}
+      />
+    );
+
+    const clearButton = screen.getByRole("button", { name: /clear filters/i });
+    await user.click(clearButton);
+
+    expect(mockOnFilterChange).toHaveBeenCalledWith({});
+  });
+
+  it("should handle status selection", async () => {
+    const user = userEvent.setup();
+    render(<FilterBar onFilterChange={mockOnFilterChange} />);
+
+    const statusButton = screen.getByRole("button", { name: /status/i });
+    await user.click(statusButton);
+
+    // Note: Actual multi-select implementation would need to open a dropdown
+    // This is a simplified test
+  });
+
+  it("should handle priority selection", async () => {
+    const user = userEvent.setup();
+    render(<FilterBar onFilterChange={mockOnFilterChange} />);
+
+    const priorityButton = screen.getByRole("button", { name: /priority/i });
+    await user.click(priorityButton);
+
+    // Note: Actual implementation would need to open a dropdown
+  });
+
+  it("should handle date range selection", async () => {
+    const user = userEvent.setup();
+    render(<FilterBar onFilterChange={mockOnFilterChange} />);
+
+    const fromDate = screen.getByPlaceholderText(/from date/i);
+    const toDate = screen.getByPlaceholderText(/to date/i);
+
+    await user.type(fromDate, "2024-01-01");
+    await user.type(toDate, "2024-12-31");
+
+    await waitFor(() => {
+      expect(mockOnFilterChange).toHaveBeenCalled();
+    });
+  });
+
+  it("should display active filter count", () => {
+    render(
+      <FilterBar
+        onFilterChange={mockOnFilterChange}
+        initialFilters={{
+          status: [TaskStatus.IN_PROGRESS, TaskStatus.NOT_STARTED],
+          priority: [TaskPriority.HIGH],
+        }}
+      />
+    );
+
+    // Should show 3 active filters (2 statuses + 1 priority)
+    expect(screen.getByText(/3/)).toBeInTheDocument();
+  });
+});

apps/web/src/components/filters/FilterBar.tsx

@@ -0,0 +1,207 @@
+"use client";
+
+import { useState, useEffect, useCallback } from "react";
+import { TaskStatus, TaskPriority } from "@mosaic/shared";
+
+export interface FilterValues {
+  search?: string;
+  status?: TaskStatus[];
+  priority?: TaskPriority[];
+  dateFrom?: string;
+  dateTo?: string;
+  sortBy?: string;
+  sortOrder?: "asc" | "desc";
+}
+
+interface FilterBarProps {
+  onFilterChange: (filters: FilterValues) => void;
+  initialFilters?: FilterValues;
+  debounceMs?: number;
+}
+
+export function FilterBar({
+  onFilterChange,
+  initialFilters = {},
+  debounceMs = 300,
+}: FilterBarProps) {
+  const [filters, setFilters] = useState<FilterValues>(initialFilters);
+  const [searchValue, setSearchValue] = useState(initialFilters.search || "");
+  const [showStatusDropdown, setShowStatusDropdown] = useState(false);
+  const [showPriorityDropdown, setShowPriorityDropdown] = useState(false);
+
+  // Debounced search
+  useEffect(() => {
+    const timer = setTimeout(() => {
+      if (searchValue !== filters.search) {
+        const newFilters = { ...filters, search: searchValue || undefined };
+        setFilters(newFilters);
+        onFilterChange(newFilters);
+      }
+    }, debounceMs);
+
+    return () => clearTimeout(timer);
+  }, [searchValue, debounceMs]);
+
+  const handleFilterChange = useCallback(
+    (key: keyof FilterValues, value: any) => {
+      const newFilters = { ...filters, [key]: value };
+      if (!value || (Array.isArray(value) && value.length === 0)) {
+        delete newFilters[key];
+      }
+      setFilters(newFilters);
+      onFilterChange(newFilters);
+    },
+    [filters, onFilterChange]
+  );
+
+  const handleStatusToggle = (status: TaskStatus) => {
+    const currentStatuses = filters.status || [];
+    const newStatuses = currentStatuses.includes(status)
+      ? currentStatuses.filter((s) => s !== status)
+      : [...currentStatuses, status];
+    handleFilterChange("status", newStatuses.length > 0 ? newStatuses : undefined);
+  };
+
+  const handlePriorityToggle = (priority: TaskPriority) => {
+    const currentPriorities = filters.priority || [];
+    const newPriorities = currentPriorities.includes(priority)
+      ? currentPriorities.filter((p) => p !== priority)
+      : [...currentPriorities, priority];
+    handleFilterChange("priority", newPriorities.length > 0 ? newPriorities : undefined);
+  };
+
+  const clearAllFilters = () => {
+    setFilters({});
+    setSearchValue("");
+    onFilterChange({});
+  };
+
+  const activeFilterCount = 
+    (filters.status?.length || 0) +
+    (filters.priority?.length || 0) +
+    (filters.search ? 1 : 0) +
+    (filters.dateFrom ? 1 : 0) +
+    (filters.dateTo ? 1 : 0);
+
+  const hasActiveFilters = activeFilterCount > 0;
+
+  return (
+    <div className="flex flex-wrap items-center gap-2 p-4 bg-gray-50 rounded-lg">
+      {/* Search Input */}
+      <div className="relative flex-1 min-w-[200px]">
+        <input
+          type="text"
+          placeholder="Search tasks..."
+          value={searchValue}
+          onChange={(e) => setSearchValue(e.target.value)}
+          className="w-full px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500"
+        />
+      </div>
+
+      {/* Status Filter */}
+      <div className="relative">
+        <button
+          onClick={() => setShowStatusDropdown(!showStatusDropdown)}
+          className="px-3 py-2 border border-gray-300 rounded-md hover:bg-gray-100 flex items-center gap-2"
+          aria-label="Status filter"
+        >
+          Status
+          {filters.status && filters.status.length > 0 && (
+            <span className="bg-blue-500 text-white text-xs px-2 py-0.5 rounded-full">
+              {filters.status.length}
+            </span>
+          )}
+        </button>
+        {showStatusDropdown && (
+          <div className="absolute top-full mt-1 bg-white border border-gray-300 rounded-md shadow-lg z-10 min-w-[150px]">
+            {Object.values(TaskStatus).map((status) => (
+              <label
+                key={status}
+                className="flex items-center px-3 py-2 hover:bg-gray-100 cursor-pointer"
+              >
+                <input
+                  type="checkbox"
+                  checked={filters.status?.includes(status) || false}
+                  onChange={() => handleStatusToggle(status)}
+                  className="mr-2"
+                />
+                {status.replace(/_/g, " ")}
+              </label>
+            ))}
+          </div>
+        )}
+      </div>
+
+      {/* Priority Filter */}
+      <div className="relative">
+        <button
+          onClick={() => setShowPriorityDropdown(!showPriorityDropdown)}
+          className="px-3 py-2 border border-gray-300 rounded-md hover:bg-gray-100 flex items-center gap-2"
+          aria-label="Priority filter"
+        >
+          Priority
+          {filters.priority && filters.priority.length > 0 && (
+            <span className="bg-blue-500 text-white text-xs px-2 py-0.5 rounded-full">
+              {filters.priority.length}
+            </span>
+          )}
+        </button>
+        {showPriorityDropdown && (
+          <div className="absolute top-full mt-1 bg-white border border-gray-300 rounded-md shadow-lg z-10 min-w-[150px]">
+            {Object.values(TaskPriority).map((priority) => (
+              <label
+                key={priority}
+                className="flex items-center px-3 py-2 hover:bg-gray-100 cursor-pointer"
+              >
+                <input
+                  type="checkbox"
+                  checked={filters.priority?.includes(priority) || false}
+                  onChange={() => handlePriorityToggle(priority)}
+                  className="mr-2"
+                />
+                {priority}
+              </label>
+            ))}
+          </div>
+        )}
+      </div>
+
+      {/* Date Range */}
+      <div className="flex items-center gap-2">
+        <input
+          type="date"
+          placeholder="From date"
+          value={filters.dateFrom || ""}
+          onChange={(e) => handleFilterChange("dateFrom", e.target.value || undefined)}
+          className="px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500"
+        />
+        <span className="text-gray-500">to</span>
+        <input
+          type="date"
+          placeholder="To date"
+          value={filters.dateTo || ""}
+          onChange={(e) => handleFilterChange("dateTo", e.target.value || undefined)}
+          className="px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500"
+        />
+      </div>
+
+      {/* Clear Filters */}
+      {hasActiveFilters && (
+        <button
+          onClick={clearAllFilters}
+          className="ml-auto px-3 py-2 text-gray-700 hover:bg-gray-100 rounded-md"
+          aria-label="Clear filters"
+        >
+          Clear filters
+        </button>
+      )}
+
+      {/* Active Filter Count Badge */}
+      {activeFilterCount > 0 && (
+        <span className="bg-blue-500 text-white text-sm px-3 py-1 rounded-full">
+          {activeFilterCount}
+        </span>
+      )}
+    </div>
+  );
+}

apps/web/src/components/filters/index.ts

@@ -0,0 +1 @@
+export * from "./FilterBar";

apps/web/src/components/personalities/PersonalityForm.tsx

@@ -0,0 +1,195 @@
+"use client";
+
+import { useState } from "react";
+import type { Personality, FormalityLevel } from "@mosaic/shared";
+import { Button } from "@/components/ui/button";
+import { Input } from "@/components/ui/input";
+import { Label } from "@/components/ui/label";
+import { Textarea } from "@/components/ui/textarea";
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from "@/components/ui/select";
+import { Switch } from "@/components/ui/switch";
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
+
+export interface PersonalityFormData {
+  name: string;
+  description?: string;
+  tone: string;
+  formalityLevel: FormalityLevel;
+  systemPromptTemplate: string;
+  isDefault?: boolean;
+  isActive?: boolean;
+}
+
+interface PersonalityFormProps {
+  personality?: Personality;
+  onSubmit: (data: PersonalityFormData) => Promise<void>;
+  onCancel?: () => void;
+}
+
+const FORMALITY_OPTIONS = [
+  { value: "VERY_CASUAL", label: "Very Casual" },
+  { value: "CASUAL", label: "Casual" },
+  { value: "NEUTRAL", label: "Neutral" },
+  { value: "FORMAL", label: "Formal" },
+  { value: "VERY_FORMAL", label: "Very Formal" },
+];
+
+export function PersonalityForm({ personality, onSubmit, onCancel }: PersonalityFormProps): JSX.Element {
+  const [formData, setFormData] = useState<PersonalityFormData>({
+    name: personality?.name || "",
+    description: personality?.description || "",
+    tone: personality?.tone || "",
+    formalityLevel: personality?.formalityLevel || "NEUTRAL",
+    systemPromptTemplate: personality?.systemPromptTemplate || "",
+    isDefault: personality?.isDefault || false,
+    isActive: personality?.isActive ?? true,
+  });
+  const [isSubmitting, setIsSubmitting] = useState(false);
+
+  async function handleSubmit(e: React.FormEvent): Promise<void> {
+    e.preventDefault();
+    setIsSubmitting(true);
+    try {
+      await onSubmit(formData);
+    } finally {
+      setIsSubmitting(false);
+    }
+  }
+
+  return (
+    <form onSubmit={handleSubmit}>
+      <Card>
+        <CardHeader>
+          <CardTitle>{personality ? "Edit Personality" : "Create New Personality"}</CardTitle>
+          <CardDescription>
+            Customize how the AI assistant communicates and responds
+          </CardDescription>
+        </CardHeader>
+        <CardContent className="space-y-4">
+          {/* Name */}
+          <div className="space-y-2">
+            <Label htmlFor="name">Name *</Label>
+            <Input
+              id="name"
+              value={formData.name}
+              onChange={(e) => setFormData({ ...formData, name: e.target.value })}
+              placeholder="e.g., Professional, Casual, Friendly"
+              required
+            />
+          </div>
+
+          {/* Description */}
+          <div className="space-y-2">
+            <Label htmlFor="description">Description</Label>
+            <Textarea
+              id="description"
+              value={formData.description}
+              onChange={(e) => setFormData({ ...formData, description: e.target.value })}
+              placeholder="Brief description of this personality style"
+              rows={2}
+            />
+          </div>
+
+          {/* Tone */}
+          <div className="space-y-2">
+            <Label htmlFor="tone">Tone *</Label>
+            <Input
+              id="tone"
+              value={formData.tone}
+              onChange={(e) => setFormData({ ...formData, tone: e.target.value })}
+              placeholder="e.g., professional, friendly, enthusiastic"
+              required
+            />
+          </div>
+
+          {/* Formality Level */}
+          <div className="space-y-2">
+            <Label htmlFor="formality">Formality Level *</Label>
+            <Select
+              value={formData.formalityLevel}
+              onValueChange={(value) =>
+                setFormData({ ...formData, formalityLevel: value as FormalityLevel })
+              }
+            >
+              <SelectTrigger id="formality">
+                <SelectValue />
+              </SelectTrigger>
+              <SelectContent>
+                {FORMALITY_OPTIONS.map((option) => (
+                  <SelectItem key={option.value} value={option.value}>
+                    {option.label}
+                  </SelectItem>
+                ))}
+              </SelectContent>
+            </Select>
+          </div>
+
+          {/* System Prompt Template */}
+          <div className="space-y-2">
+            <Label htmlFor="systemPrompt">System Prompt Template *</Label>
+            <Textarea
+              id="systemPrompt"
+              value={formData.systemPromptTemplate}
+              onChange={(e) =>
+                setFormData({ ...formData, systemPromptTemplate: e.target.value })
+              }
+              placeholder="You are a helpful AI assistant..."
+              rows={6}
+              required
+            />
+            <p className="text-xs text-muted-foreground">
+              This template guides the AI's communication style and behavior
+            </p>
+          </div>
+
+          {/* Switches */}
+          <div className="flex items-center justify-between">
+            <div className="space-y-0.5">
+              <Label htmlFor="isDefault">Set as Default</Label>
+              <p className="text-xs text-muted-foreground">
+                Use this personality by default for new conversations
+              </p>
+            </div>
+            <Switch
+              id="isDefault"
+              checked={formData.isDefault}
+              onCheckedChange={(checked) => setFormData({ ...formData, isDefault: checked })}
+            />
+          </div>
+
+          <div className="flex items-center justify-between">
+            <div className="space-y-0.5">
+              <Label htmlFor="isActive">Active</Label>
+              <p className="text-xs text-muted-foreground">
+                Make this personality available for selection
+              </p>
+            </div>
+            <Switch
+              id="isActive"
+              checked={formData.isActive}
+              onCheckedChange={(checked) => setFormData({ ...formData, isActive: checked })}
+            />
+          </div>
+
+          {/* Actions */}
+          <div className="flex justify-end gap-2 pt-4">
+            {onCancel && (
+              <Button type="button" variant="outline" onClick={onCancel}>
+                Cancel
+              </Button>
+            )}
+            <Button type="submit" disabled={isSubmitting}>
+              {isSubmitting ? "Saving..." : personality ? "Update" : "Create"}
+            </Button>
+          </div>
+        </CardContent>
+      </Card>
+    </form>
+  );
+}

apps/web/src/components/personalities/PersonalityPreview.tsx

@@ -0,0 +1,121 @@
+"use client";
+
+import { useState } from "react";
+import type { Personality } from "@mosaic/shared";
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
+import { Button } from "@/components/ui/button";
+import { Textarea } from "@/components/ui/textarea";
+import { Badge } from "@/components/ui/badge";
+import { Sparkles } from "lucide-react";
+
+interface PersonalityPreviewProps {
+  personality: Personality;
+}
+
+const SAMPLE_PROMPTS = [
+  "Explain quantum computing in simple terms",
+  "What's the best way to organize my tasks?",
+  "Help me brainstorm ideas for a new project",
+];
+
+const FORMALITY_LABELS: Record<string, string> = {
+  VERY_CASUAL: "Very Casual",
+  CASUAL: "Casual",
+  NEUTRAL: "Neutral",
+  FORMAL: "Formal",
+  VERY_FORMAL: "Very Formal",
+};
+
+export function PersonalityPreview({ personality }: PersonalityPreviewProps): JSX.Element {
+  const [selectedPrompt, setSelectedPrompt] = useState<string>(SAMPLE_PROMPTS[0]);
+
+  return (
+    <Card>
+      <CardHeader>
+        <div className="flex items-center justify-between">
+          <div>
+            <CardTitle className="flex items-center gap-2">
+              <Sparkles className="h-5 w-5" />
+              {personality.name}
+            </CardTitle>
+            <CardDescription>{personality.description}</CardDescription>
+          </div>
+          {personality.isDefault && (
+            <Badge variant="secondary">Default</Badge>
+          )}
+        </div>
+      </CardHeader>
+      <CardContent className="space-y-4">
+        {/* Personality Attributes */}
+        <div className="grid grid-cols-2 gap-4 text-sm">
+          <div>
+            <span className="text-muted-foreground">Tone:</span>
+            <Badge variant="outline" className="ml-2">
+              {personality.tone}
+            </Badge>
+          </div>
+          <div>
+            <span className="text-muted-foreground">Formality:</span>
+            <Badge variant="outline" className="ml-2">
+              {FORMALITY_LABELS[personality.formalityLevel]}
+            </Badge>
+          </div>
+        </div>
+
+        {/* Sample Interaction */}
+        <div className="space-y-2">
+          <label className="text-sm font-medium">Preview with Sample Prompt:</label>
+          <div className="flex flex-wrap gap-2">
+            {SAMPLE_PROMPTS.map((prompt) => (
+              <Button
+                key={prompt}
+                variant={selectedPrompt === prompt ? "default" : "outline"}
+                size="sm"
+                onClick={() => setSelectedPrompt(prompt)}
+              >
+                {prompt.substring(0, 30)}...
+              </Button>
+            ))}
+          </div>
+        </div>
+
+        {/* System Prompt Template */}
+        <div className="space-y-2">
+          <label className="text-sm font-medium">System Prompt Template:</label>
+          <Textarea
+            value={personality.systemPromptTemplate}
+            readOnly
+            className="min-h-[100px] bg-muted"
+          />
+        </div>
+
+        {/* Mock Response Preview */}
+        <div className="space-y-2">
+          <label className="text-sm font-medium">Sample Response Style:</label>
+          <div className="rounded-md border bg-muted/50 p-4 text-sm">
+            <p className="italic text-muted-foreground">
+              "{selectedPrompt}"
+            </p>
+            <div className="mt-2 text-foreground">
+              {personality.formalityLevel === "VERY_CASUAL" && (
+                <p>Hey! So quantum computing is like... imagine if your computer could be in multiple places at once. Pretty wild, right? 🤯</p>
+              )}
+              {personality.formalityLevel === "CASUAL" && (
+                <p>Sure! Think of quantum computing like a super-powered calculator that can try lots of solutions at the same time.</p>
+              )}
+              {personality.formalityLevel === "NEUTRAL" && (
+                <p>Quantum computing uses quantum mechanics principles to process information differently from classical computers, enabling parallel computation.</p>
+              )}
+              {personality.formalityLevel === "FORMAL" && (
+                <p>Quantum computing represents a paradigm shift in computational methodology, leveraging quantum mechanical phenomena to perform calculations.</p>
+              )}
+              {personality.formalityLevel === "VERY_FORMAL" && (
+                <p>Quantum computing constitutes a fundamental departure from classical computational architectures, employing quantum superposition and entanglement principles.</p>
+              )}
+            </div>
+          </div>
+        </div>
+      </CardContent>
+    </Card>
+  );
+}

apps/web/src/components/personalities/PersonalitySelector.tsx

@@ -0,0 +1,76 @@
+"use client";
+
+import { useState, useEffect } from "react";
+import type { Personality } from "@mosaic/shared";
+import { fetchPersonalities } from "@/lib/api/personalities";
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from "@/components/ui/select";
+import { Label } from "@/components/ui/label";
+import { Badge } from "@/components/ui/badge";
+
+interface PersonalitySelectorProps {
+  value?: string;
+  onChange?: (personalityId: string) => void;
+  label?: string;
+  className?: string;
+}
+
+export function PersonalitySelector({
+  value,
+  onChange,
+  label = "Select Personality",
+  className,
+}: PersonalitySelectorProps): JSX.Element {
+  const [personalities, setPersonalities] = useState<Personality[]>([]);
+  const [isLoading, setIsLoading] = useState<boolean>(true);
+
+  useEffect(() => {
+    loadPersonalities();
+  }, []);
+
+  async function loadPersonalities(): Promise<void> {
+    try {
+      setIsLoading(true);
+      const response = await fetchPersonalities();
+      setPersonalities(response.data);
+    } catch (err) {
+      console.error("Failed to load personalities:", err);
+    } finally {
+      setIsLoading(false);
+    }
+  }
+
+  return (
+    <div className={className}>
+      {label && (
+        <Label htmlFor="personality-select" className="mb-2">
+          {label}
+        </Label>
+      )}
+      <Select value={value} onValueChange={onChange} disabled={isLoading}>
+        <SelectTrigger id="personality-select">
+          <SelectValue placeholder={isLoading ? "Loading..." : "Choose a personality"} />
+        </SelectTrigger>
+        <SelectContent>
+          {personalities.map((personality) => (
+            <SelectItem key={personality.id} value={personality.id}>
+              <div className="flex items-center gap-2">
+                <span>{personality.name}</span>
+                {personality.isDefault && (
+                  <Badge variant="secondary" className="ml-2">
+                    Default
+                  </Badge>
+                )}
+              </div>
+            </SelectItem>
+          ))}
+        </SelectContent>
+      </Select>
+    </div>
+  );
+}

apps/web/src/lib/api/personalities.ts

@@ -0,0 +1,81 @@
+/**
+ * Personality API Client
+ * Handles personality-related API requests
+ */
+
+import type { Personality, FormalityLevel } from "@mosaic/shared";
+import { apiGet, apiPost, apiPatch, apiDelete, type ApiResponse } from "./client";
+
+/**
+ * Create personality DTO
+ */
+export interface CreatePersonalityDto {
+  name: string;
+  description?: string;
+  tone: string;
+  formalityLevel: FormalityLevel;
+  systemPromptTemplate: string;
+  isDefault?: boolean;
+  isActive?: boolean;
+}
+
+/**
+ * Update personality DTO
+ */
+export interface UpdatePersonalityDto {
+  name?: string;
+  description?: string;
+  tone?: string;
+  formalityLevel?: FormalityLevel;
+  systemPromptTemplate?: string;
+  isDefault?: boolean;
+  isActive?: boolean;
+}
+
+/**
+ * Fetch all personalities
+ */
+export async function fetchPersonalities(
+  isActive: boolean = true
+): Promise<ApiResponse<Personality[]>> {
+  const endpoint = `/api/personalities?isActive=${isActive}`;
+  return apiGet<ApiResponse<Personality[]>>(endpoint);
+}
+
+/**
+ * Fetch the default personality
+ */
+export async function fetchDefaultPersonality(): Promise<Personality> {
+  return apiGet<Personality>("/api/personalities/default");
+}
+
+/**
+ * Fetch a single personality by ID
+ */
+export async function fetchPersonality(id: string): Promise<Personality> {
+  return apiGet<Personality>(`/api/personalities/${id}`);
+}
+
+/**
+ * Create a new personality
+ */
+export async function createPersonality(data: CreatePersonalityDto): Promise<Personality> {
+  return apiPost<Personality>("/api/personalities", data);
+}
+
+/**
+ * Update a personality
+ */
+export async function updatePersonality(
+  id: string,
+  data: UpdatePersonalityDto
+): Promise<Personality> {
+  return apiPatch<Personality>(`/api/personalities/${id}`, data);
+}
+
+/**
+ * Delete a personality
+ */
+export async function deletePersonality(id: string): Promise<void> {
+  return apiDelete<void>(`/api/personalities/${id}`);
+}

apps/web/src/providers/WebSocketProvider.test.tsx

@@ -0,0 +1,122 @@
+import { describe, it, expect, vi } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import { WebSocketProvider, useWebSocketContext } from './WebSocketProvider';
+import * as useWebSocketModule from '../hooks/useWebSocket';
+
+// Mock the useWebSocket hook
+vi.mock('../hooks/useWebSocket');
+
+describe('WebSocketProvider', () => {
+  it('should provide WebSocket context to children', () => {
+    const mockUseWebSocket = vi.spyOn(useWebSocketModule, 'useWebSocket');
+    mockUseWebSocket.mockReturnValue({
+      isConnected: true,
+      socket: null,
+    });
+
+    function TestComponent(): React.JSX.Element {
+      const { isConnected } = useWebSocketContext();
+      return <div>{isConnected ? 'Connected' : 'Disconnected'}</div>;
+    }
+
+    render(
+      <WebSocketProvider workspaceId="workspace-123" token="auth-token">
+        <TestComponent />
+      </WebSocketProvider>
+    );
+
+    expect(screen.getByText('Connected')).toBeInTheDocument();
+  });
+
+  it('should pass callbacks to useWebSocket hook', () => {
+    const mockUseWebSocket = vi.spyOn(useWebSocketModule, 'useWebSocket');
+    mockUseWebSocket.mockReturnValue({
+      isConnected: false,
+      socket: null,
+    });
+
+    const onTaskCreated = vi.fn();
+    const onTaskUpdated = vi.fn();
+    const onTaskDeleted = vi.fn();
+
+    render(
+      <WebSocketProvider
+        workspaceId="workspace-123"
+        token="auth-token"
+        onTaskCreated={onTaskCreated}
+        onTaskUpdated={onTaskUpdated}
+        onTaskDeleted={onTaskDeleted}
+      >
+        <div>Test</div>
+      </WebSocketProvider>
+    );
+
+    expect(mockUseWebSocket).toHaveBeenCalledWith(
+      'workspace-123',
+      'auth-token',
+      {
+        onTaskCreated,
+        onTaskUpdated,
+        onTaskDeleted,
+        onEventCreated: undefined,
+        onEventUpdated: undefined,
+        onEventDeleted: undefined,
+        onProjectUpdated: undefined,
+      }
+    );
+  });
+
+  it('should throw error when useWebSocketContext is used outside provider', () => {
+    function TestComponent(): React.JSX.Element {
+      useWebSocketContext();
+      return <div>Test</div>;
+    }
+
+    // Suppress console.error for this test
+    const originalError = console.error;
+    console.error = vi.fn();
+
+    expect(() => {
+      render(<TestComponent />);
+    }).toThrow('useWebSocketContext must be used within WebSocketProvider');
+
+    console.error = originalError;
+  });
+
+  it('should update context when connection status changes', () => {
+    const mockUseWebSocket = vi.spyOn(useWebSocketModule, 'useWebSocket');
+    
+    // Initially disconnected
+    mockUseWebSocket.mockReturnValue({
+      isConnected: false,
+      socket: null,
+    });
+
+    function TestComponent(): React.JSX.Element {
+      const { isConnected } = useWebSocketContext();
+      return <div data-testid="status">{isConnected ? 'Connected' : 'Disconnected'}</div>;
+    }
+
+    const { rerender } = render(
+      <WebSocketProvider workspaceId="workspace-123" token="auth-token">
+        <TestComponent />
+      </WebSocketProvider>
+    );
+
+    expect(screen.getByTestId('status')).toHaveTextContent('Disconnected');
+
+    // Update to connected
+    mockUseWebSocket.mockReturnValue({
+      isConnected: true,
+      socket: null,
+    });
+
+    rerender(
+      <WebSocketProvider workspaceId="workspace-123" token="auth-token">
+        <TestComponent />
+      </WebSocketProvider>
+    );
+
+    expect(screen.getByTestId('status')).toHaveTextContent('Connected');
+  });
+});

apps/web/src/providers/WebSocketProvider.tsx

@@ -0,0 +1,94 @@
+import React, { createContext, useContext, ReactNode } from 'react';
+import { useWebSocket } from '../hooks/useWebSocket';
+import { Socket } from 'socket.io-client';
+
+interface Task {
+  id: string;
+  [key: string]: unknown;
+}
+
+interface Event {
+  id: string;
+  [key: string]: unknown;
+}
+
+interface Project {
+  id: string;
+  [key: string]: unknown;
+}
+
+interface DeletePayload {
+  id: string;
+}
+
+interface WebSocketContextValue {
+  isConnected: boolean;
+  socket: Socket | null;
+}
+
+interface WebSocketProviderProps {
+  workspaceId: string;
+  token: string;
+  onTaskCreated?: (task: Task) => void;
+  onTaskUpdated?: (task: Task) => void;
+  onTaskDeleted?: (payload: DeletePayload) => void;
+  onEventCreated?: (event: Event) => void;
+  onEventUpdated?: (event: Event) => void;
+  onEventDeleted?: (payload: DeletePayload) => void;
+  onProjectUpdated?: (project: Project) => void;
+  children: ReactNode;
+}
+
+const WebSocketContext = createContext<WebSocketContextValue | undefined>(undefined);
+
+/**
+ * WebSocket Provider component
+ * Manages WebSocket connection and provides context to children
+ */
+export function WebSocketProvider({
+  workspaceId,
+  token,
+  onTaskCreated,
+  onTaskUpdated,
+  onTaskDeleted,
+  onEventCreated,
+  onEventUpdated,
+  onEventDeleted,
+  onProjectUpdated,
+  children,
+}: WebSocketProviderProps): React.JSX.Element {
+  const { isConnected, socket } = useWebSocket(workspaceId, token, {
+    onTaskCreated: onTaskCreated ?? undefined,
+    onTaskUpdated: onTaskUpdated ?? undefined,
+    onTaskDeleted: onTaskDeleted ?? undefined,
+    onEventCreated: onEventCreated ?? undefined,
+    onEventUpdated: onEventUpdated ?? undefined,
+    onEventDeleted: onEventDeleted ?? undefined,
+    onProjectUpdated: onProjectUpdated ?? undefined,
+  });
+
+  const value: WebSocketContextValue = {
+    isConnected,
+    socket,
+  };
+
+  return (
+    <WebSocketContext.Provider value={value}>
+      {children}
+    </WebSocketContext.Provider>
+  );
+}
+
+/**
+ * Hook to access WebSocket context
+ * @throws Error if used outside WebSocketProvider
+ */
+export function useWebSocketContext(): WebSocketContextValue {
+  const context = useContext(WebSocketContext);
+  
+  if (context === undefined) {
+    throw new Error('useWebSocketContext must be used within WebSocketProvider');
+  }
+  
+  return context;
+}