feat: #58 Tests E2E Playwright — 44 tests desktop + CI

- playwright.config.ts: chromium-desktop + chromium-mobile
- tests/e2e/obsigate.spec.ts: 44 tests en 11 sections
  - Dashboard & Navigation (8 tests)
  - Full-Text Search (10 tests)
  - File Navigation & Viewer (5 tests)
  - Editor (4 tests: Forge, basic modal, Ctrl+S)
  - Mermaid Diagrams (2 tests)
  - PDF Export, Dark Mode, Responsive, Saved Searches
  - Keyboard Shortcuts (Ctrl+K, /, Escape)
  - Context Menu directory
- CI: nouveau job e2e dans .gitea/workflows/ci.yml
- ROADMAP: #58 marque FAIT
- .gitignore: node_modules, test-results, playwright-report

package.json

@@ -0,0 +1,24 @@
+{
+  "name": "obsigate",
+  "version": "1.0.0",
+  "description": "**Porte d'entrée web ultra-léger pour vos vaults Obsidian** — Accédez, naviguez et recherchez dans toutes vos notes Obsidian depuis n'importe quel appareil via une interface web moderne et responsive.",
+  "main": "patch.js",
+  "directories": {
+    "doc": "docs",
+    "test": "tests"
+  },
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://git.dracodev.net/Projets/ObsiGate.git"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "commonjs",
+  "devDependencies": {
+    "@playwright/test": "^1.61.0"
+  }
+}