✨ feat(frontend): Storybook + auto-generated Playwright e2e docs with screenshots (#30)

Storybook 8 + Playwright JSON reporter + auto-generated markdown docs with embedded screenshots and breadcrumbs. Frontend PRs now reviewable from Gitea web UI. ~95% Mistral autonomous via ICM workspace, trainer commit/PR (Mistral hit turn limit).

Co-authored-by: Gabriel Radureau <arcodange@gmail.com>
Co-committed-by: Gabriel Radureau <arcodange@gmail.com>

frontend/package.json

@@ -6,12 +6,20 @@
     "dev": "nuxt dev",
     "generate": "nuxt generate",
     "preview": "nuxt preview",
-    "postinstall": "nuxt prepare"
+    "postinstall": "nuxt prepare",
+    "storybook": "storybook dev -p 6006",
+    "build-storybook": "storybook build",
+    "docs:gen": "playwright test && node scripts/generate-test-docs.mjs",
+    "docs:full": "npm run build-storybook && npm run docs:gen"
   },
   "devDependencies": {
     "@playwright/test": "^1.59.1",
+    "@storybook/addon-essentials": "^8.0.0",
+    "@storybook/vue3": "^8.0.0",
+    "@storybook/vue3-vite": "^8.0.0",
     "@types/node": "^25.6.0",
     "nuxt": "^3.13.0",
+    "storybook": "^8.0.0",
     "typescript": "^6.0.3"
   },
   "packageManager": "npm@11.5.2"