chore(frontend): add ESLint + Prettier; fix real findings; format the tree

The frontend had no JS/TS linter — only svelte-check. Add flat-config ESLint (typescript-eslint
+ eslint-plugin-svelte) and Prettier (tabs/single-quote, matching the existing style).

Rules encode "catch bugs, not enforce taste":
  - svelte/require-each-key KEPT — it is the exact bug class as the feed mis-tap fix. Fixed every
    flagged block: keyed activeFilters, filteredUsers, stagedFiles (by previewUrl), captionTags,
    admin tabs/jobs/users, the export-viewer suggestions/filters/comments, and the static skeleton
    loops.
  - svelte/prefer-svelte-reactivity KEPT — inline-disabled only the verified-safe sites (a local
    freq Map in a $derived.by, throwaway URLSearchParams query builders), with a reason each.
  - svelte/no-navigation-without-resolve OFF — wants resolve() around every goto()/href; taste, not
    a bug, and pure churn.
  - svelte/no-unused-svelte-ignore OFF — those comments are consumed by svelte-check, which ESLint
    can't see, so it wrongly calls them unused; removing them would reintroduce a11y warnings.
  - no-explicit-any OFF for *.test.ts only (partial fixtures legitimately use any).

Real code fixes beyond keys: removed a dead jobLabel(), an unused ViewerComment import and unused
catch binding, an unused scroll-lock arg, and replaced an empty interface with a type alias.

Then `prettier --write` (54 files). Formatting only. Verified: eslint clean, svelte-check 0 errors,
vitest 46 passed, vite build succeeds.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/lib/toast-store.ts

@@ -20,14 +20,20 @@ export function toast(message: string, tone: ToastTone = 'info', ttl = 4000): nu
 	const entry: Toast = { id, message, tone, ttl };
 	toasts.update((list) => [...list, entry]);
 	if (ttl > 0 && typeof window !== 'undefined') {
-		timers.set(id, setTimeout(() => dismissToast(id), ttl));
+		timers.set(
+			id,
+			setTimeout(() => dismissToast(id), ttl)
+		);
 	}
 	return id;
 }
 
 export function dismissToast(id: number): void {
 	const t = timers.get(id);
-	if (t) { clearTimeout(t); timers.delete(id); }
+	if (t) {
+		clearTimeout(t);
+		timers.delete(id);
+	}
 	toasts.update((list) => list.filter((x) => x.id !== id));
 }