feat: add three viewing modes for app specification (#566)

* feat: add three viewing modes for app specification

Introduces View, Edit, and Source modes for the spec page:

- View: Clean read-only display with cards, badges, and accordions
- Edit: Structured form-based editor for all spec fields
- Source: Raw XML editor for advanced users

Also adds @automaker/spec-parser shared package for XML parsing
between server and client.

* fix: address PR review feedback

- Replace array index keys with stable UUIDs in array-field-editor,
  features-section, and roadmap-section components
- Replace regex-based XML parsing with fast-xml-parser for robustness
- Simplify renderContent logic in spec-view by removing dead code paths

* fix: convert git+ssh URLs to https in package-lock.json

* fix: address PR review feedback for spec visualiser

- Remove unused RefreshCw import from spec-view.tsx
- Add explicit parsedSpec check in renderContent for robustness
- Hide save button in view mode since it's read-only
- Remove GripVertical drag handles since drag-and-drop is not implemented
- Rename Map imports to MapIcon to avoid shadowing global Map
- Escape tagName in xml-utils.ts RegExp functions for safety
- Add aria-label attributes for accessibility on mode tabs

* fix: address additional PR review feedback

- Fix Textarea controlled/uncontrolled warning with default value
- Preserve IDs in useEffect sync to avoid unnecessary remounts
- Consolidate lucide-react imports
- Add JSDoc note about tag attributes limitation in xml-utils.ts
- Remove redundant disabled prop from SpecModeTabs

libs/spec-parser/package.json

@@ -0,0 +1,39 @@
+{
+  "name": "@automaker/spec-parser",
+  "version": "1.0.0",
+  "type": "module",
+  "description": "XML spec parser for AutoMaker - parses and generates app_spec.txt XML",
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "default": "./dist/index.js"
+    }
+  },
+  "scripts": {
+    "build": "tsc",
+    "watch": "tsc --watch",
+    "test": "vitest run",
+    "test:watch": "vitest"
+  },
+  "keywords": [
+    "automaker",
+    "spec-parser",
+    "xml"
+  ],
+  "author": "AutoMaker Team",
+  "license": "SEE LICENSE IN LICENSE",
+  "engines": {
+    "node": ">=22.0.0 <23.0.0"
+  },
+  "dependencies": {
+    "@automaker/types": "1.0.0",
+    "fast-xml-parser": "^5.3.3"
+  },
+  "devDependencies": {
+    "@types/node": "22.19.3",
+    "typescript": "5.9.3",
+    "vitest": "4.0.16"
+  }
+}