Improve plan mode display and permission prompt

- Render ExitPlanMode as formatted markdown plan with proper headings,
  lists, and code blocks instead of raw key-value dump
- Show allowed prompts as clickable action buttons below the plan
- Use 📋 Plan header instead of 🔧 ExitPlanMode
- Permission prompt says "Approve the plan above?" with Approve button
- Hide "Always allow" for plan approvals
- Full height plan content without scroll constraint

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

package.json

@@ -2,7 +2,7 @@
   "name": "claude-code-chat",
   "displayName": "Chat for Claude Code",
   "description": "Beautiful Claude Code Chat Interface for VS Code",
-  "version": "2.0.2",
+  "version": "2.0.3",
   "publisher": "AndrePimenta",
   "author": "Andre Pimenta",
   "repository": {