fix: Resolve all ESLint errors and warnings in web package

Fixes all 542 ESLint problems in the web package to achieve 0 errors and 0 warnings.

Changes:
- Fixed 144 issues: nullish coalescing, return types, unused variables
- Fixed 118 issues: unnecessary conditions, type safety, template literals
- Fixed 79 issues: non-null assertions, unsafe assignments, empty functions
- Fixed 67 issues: explicit return types, promise handling, enum comparisons
- Fixed 45 final warnings: missing return types, optional chains
- Fixed 25 typecheck-related issues: async/await, type assertions, formatting
- Fixed JSX.Element namespace errors across 90+ files

All Quality Rails violations resolved. Lint and typecheck both pass with 0 problems.

Files modified: 118 components, tests, hooks, and utilities

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

apps/web/src/app/settings/workspaces/[id]/teams/[teamId]/page.tsx

@@ -52,34 +52,38 @@ export default function TeamDetailPage(): ReactElement {
   const [team] = useState(mockTeamWithMembers);
   const [isLoading] = useState(false);
 
-  const handleUpdateTeam = async (data: { name?: string; description?: string }): Promise<void> => {
+  const handleUpdateTeam = (data: { name?: string; description?: string }): Promise<void> => {
     // TODO: Replace with real API call
     // await updateTeam(workspaceId, teamId, data);
     console.log("Updating team:", data);
     // TODO: Refetch team data
+    return Promise.resolve();
   };
 
-  const handleDeleteTeam = async (): Promise<void> => {
+  const handleDeleteTeam = (): Promise<void> => {
     // TODO: Replace with real API call
     // await deleteTeam(workspaceId, teamId);
     console.log("Deleting team");
 
     // Navigate back to teams list
     router.push(`/settings/workspaces/${workspaceId}/teams`);
+    return Promise.resolve();
   };
 
-  const handleAddMember = async (userId: string, role?: TeamMemberRole): Promise<void> => {
+  const handleAddMember = (userId: string, role?: TeamMemberRole): Promise<void> => {
     // TODO: Replace with real API call
     // await addTeamMember(workspaceId, teamId, { userId, role });
     console.log("Adding member:", { userId, role });
     // TODO: Refetch team data
+    return Promise.resolve();
   };
 
-  const handleRemoveMember = async (userId: string): Promise<void> => {
+  const handleRemoveMember = (userId: string): Promise<void> => {
     // TODO: Replace with real API call
     // await removeTeamMember(workspaceId, teamId, userId);
     console.log("Removing member:", userId);
     // TODO: Refetch team data
+    return Promise.resolve();
   };
 
   if (isLoading) {