Fix all ESLint errors: remove unused imports, replace any types

- Remove ~60 unused imports and variables across 88 files
- Replace ~80 `any` type annotations with proper types (unknown,
  Record<string, unknown>, or specific types)
- Prefix unused callback args with underscore
- Fix unescaped JSX entities
- Lint now passes cleanly (0 errors, 2 intentional img warnings)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/interests/interest-timeline.tsx

@@ -66,7 +66,7 @@ export function InterestTimeline({ interestId }: InterestTimelineProps) {
       {/* Vertical line */}
       <div className="absolute left-4 top-2 bottom-2 w-px bg-border" />
 
-      {events.map((event, idx) => (
+      {events.map((event, _idx) => (
         <div key={event.id} className="relative flex gap-4 pb-6">
           {/* Icon */}
           <div className="relative z-10 flex h-8 w-8 shrink-0 items-center justify-center rounded-full bg-background border">