chore: add husky pre-commit hook and auto-fix lint warnings

- Install husky for git hooks
- Add pre-commit hook to run 'npm run lint -- --fix' before each commit
- Auto-fix 6 additional warnings (attribute order, escape chars)
- 0 errors, 208 warnings (down from 214)

This ensures code quality checks run automatically before commits.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

package-lock.json

@@ -21,6 +21,7 @@
         "@eslint/js": "^9.0.0",
         "eslint": "^9.0.0",
         "eslint-plugin-vue": "^9.30.0",
+        "husky": "^9.1.7",
         "markdown-it-katex": "^2.0.3",
         "prettier": "^3.7.4",
         "vue-eslint-parser": "^9.4.3"
@@ -2653,6 +2654,22 @@
         "url": "https://github.com/fb55/entities?sponsor=1"
       }
     },
+    "node_modules/husky": {
+      "version": "9.1.7",
+      "resolved": "https://registry.npmmirror.com/husky/-/husky-9.1.7.tgz",
+      "integrity": "sha512-5gs5ytaNjBrh5Ow3zrvdUUY+0VxIuWVL4i9irt6friV+BqdCfmV11CQTWMiBYWHbXhco+J1kHfTOUkePhCDvMA==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "husky": "bin.js"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/typicode"
+      }
+    },
     "node_modules/ignore": {
       "version": "5.3.2",
       "resolved": "https://registry.npmmirror.com/ignore/-/ignore-5.3.2.tgz",