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/lib/utils/date-format.ts

@@ -11,7 +11,7 @@ import { format, isToday, isTomorrow, differenceInDays, isBefore } from "date-fn
 export function formatDate(date: Date): string {
   try {
     return format(date, "MMM d, yyyy");
-  } catch (_error) {
+  } catch {
     return "Invalid Date";
   }
 }
@@ -22,7 +22,7 @@ export function formatDate(date: Date): string {
 export function formatTime(date: Date): string {
   try {
     return format(date, "h:mm a");
-  } catch (_error) {
+  } catch {
     return "Invalid Time";
   }
 }