chore(app): decouple pnpm lint from --fix

WS-3 session 1b-ii Task 1.

Splits the apps/app lint script:
- \`pnpm lint\` → no-fix; reports problems (used in CI, in audits).
- \`pnpm lint:fix\` → --fix; explicit autofix on demand.

Resolves the cause of the WS-3 1b-i pre-flight confusion: when 'pnpm
lint' silently ran --fix, ad-hoc invocations reported the post-fix
remainder as if it were the baseline (the wrong '105' number that
broke session 1b-i's first attempt).

No code changes. Behaviour change is opt-in per script invocation.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

apps/app/package.json

@@ -8,7 +8,8 @@
     "build": "vite build",
     "preview": "vite preview --port 5050",
     "typecheck": "vue-tsc --noEmit",
-    "lint": "eslint . -c .eslintrc.cjs --fix --ext .ts,.js,.cjs,.vue,.tsx,.jsx",
+    "lint": "eslint . -c .eslintrc.cjs --ext .ts,.js,.cjs,.vue,.tsx,.jsx",
+    "lint:fix": "eslint . -c .eslintrc.cjs --fix --ext .ts,.js,.cjs,.vue,.tsx,.jsx",
     "build:icons": "tsx src/plugins/iconify/build-icons.ts",
     "msw:init": "msw init public/ --save",
     "postinstall": "npm run build:icons && npm run msw:init",