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/components/VirtualFeed.svelte

@@ -35,8 +35,7 @@
 		oncontextmenu?: (upload: FeedUpload) => void;
 	}
 
-	let { uploads, mode, myUserId, onlike, oncomment, onselect, oncontextmenu }: Props =
-		$props();
+	let { uploads, mode, myUserId, onlike, oncomment, onselect, oncontextmenu }: Props = $props();
 
 	const COLS = 3;
 	const GRID_GAP = 2; // px — matches the `gap-0.5` the non-virtual grid used.
@@ -218,7 +217,11 @@
 													/>
 												{/if}
 												<div class="absolute inset-0 flex items-center justify-center">
-													<svg class="h-10 w-10 text-white/80" fill="currentColor" viewBox="0 0 24 24">
+													<svg
+														class="h-10 w-10 text-white/80"
+														fill="currentColor"
+														viewBox="0 0 24 24"
+													>
 														<path d="M8 5v14l11-7z" />
 													</svg>
 												</div>