feat: warm-up deps — ts-reset, web-vitals, RHF devtool, query-broadcast

Four low-risk adds before the Zod 4 / drizzle-zod headliner:

- @total-typescript/ts-reset: tightens TS stdlib types globally (JSON.parse
  → unknown, fetch().json() → unknown, .filter(Boolean) narrows, Set
  literals respect typed Set targets). Caught 179 latent type errors;
  fixed all production sites (8 files) and added `any` cast escape hatch
  in test files (ESLint exemption scoped to tests/).
- web-vitals + /api/v1/internal/vitals endpoint + WebVitalsReporter
  client component: establishes Core Web Vitals baseline (LCP/INP/CLS/
  FCP/TTFB) via navigator.sendBeacon. Required before optimisation work.
- @hookform/devtools + FormDevtool wrapper: dev-only RHF state inspector,
  lazy-loaded via next/dynamic so the chunk is excluded from prod
  bundles entirely.
- @tanstack/query-broadcast-client-experimental: cross-tab cache sync
  via BroadcastChannel — wired in query-provider.tsx, 1-liner.

Audit doc updated with sections 35 + 36 (PDF stack overhaul + comprehensive
second-pass package sweep) covering ~20 package adoption candidates and
4-5 deprecation candidates.

Verified: tsc clean, vitest 1293/1293 pass.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

package.json

@@ -56,6 +56,7 @@
     "@radix-ui/react-tabs": "^1.1.13",
     "@radix-ui/react-tooltip": "^1.2.8",
     "@socket.io/redis-adapter": "^8.3.0",
+    "@tanstack/query-broadcast-client-experimental": "^5.100.10",
     "@tanstack/react-query": "^5.100.10",
     "@tanstack/react-query-devtools": "^5.100.10",
     "@tanstack/react-table": "^8.21.3",
@@ -99,12 +100,15 @@
     "tailwindcss-animate": "^1.0.7",
     "tesseract.js": "^7.0.0",
     "vaul": "^1.1.2",
+    "web-vitals": "^5.2.0",
     "zod": "^3.25.76",
     "zustand": "^5.0.13"
   },
   "devDependencies": {
     "@eslint/eslintrc": "^3.3.5",
+    "@hookform/devtools": "^4.4.0",
     "@playwright/test": "^1.60.0",
+    "@total-typescript/ts-reset": "^0.6.1",
     "@types/archiver": "^7.0.0",
     "@types/iso-3166-2": "^1.0.4",
     "@types/mailparser": "^3.4.6",