fix(frontend): resolve app-wide 'Oops' crash + PWA middleware interception

Root cause (found via Playwright browser probe — curl could not detect client-side
hydration errors):

1. ROOT-LAYOUT INTL CRASH (the 'Oops' on every page incl /login):
   app/layout.tsx renders global client components (PwaInstallPrompt → useTranslations,
   Toaster, Sonner) as siblings of {children} inside <Providers>, but only each
   route-group layout wrapped its own children in NextIntlClientProvider. So those
   global components mounted with NO intl context → 'No intl context found' → React
   hydration crash → global-error 'Oops'. Fix: wrap the root body in
   NextIntlClientProvider via getMessages() (RootLayout now async). Nested providers
   stay valid (next-intl supports nesting).

2. PWA MIDDLEWARE INTERCEPTION (manifest.json syntax error + stale cache):
   middleware matcher did not exclude /manifest.json or /sw.js, so unauthenticated
   browsers got 307→/login (HTML) for both. Browser parsed HTML as JSON
   ('manifest.json:1 Syntax error') and an HTML/old service worker kept serving
   stale bundles ('website hasn't changed' after redeploys). Fix: exclude
   manifest.json, sw.js, icons, offline from the matcher.

3. SERVICE-WORKER STALE CACHE: bump CACHE_NAME v1→v2 so the activate handler purges
   old cached bundles from clients that loaded the broken build.

Also adds scripts/debug/dashboard-probe.mjs — a Playwright probe that logs in and
captures real client-side console/network errors + screenshot.

scripts/debug/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "debug",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "playwright": "^1.60.0"
+  }
+}