fix(arcade): add host-only game selection with clear messaging

Non-host room members were getting 403 errors when trying to select games.
Added proper UI restrictions and messaging to clarify only the host can
select games.

**Changes**:

1. **Host Detection**: Check if current user is room creator
   - Find `currentMember` in `roomData.members`
   - Check `isCreator` flag

2. **Visual Restrictions**:
   - Game buttons disabled for non-hosts (opacity: 0.4, cursor: not-allowed)
   - No hover effects when disabled
   - Clear visual feedback

3. **Messaging**:
   - **Host**: "👑 You're the room host. Select a game to start playing."
   - **Non-host**: "⏳ Waiting for [Host Name] to select a game..."
   - **Error**: "⚠️ Only the room host can select a game. Ask [Host] to choose."

4. **Error Handling**:
   - Client-side check before API call
   - Server error caught and displayed with host name
   - Auto-dismiss after 5 seconds

**UX Flow**:
- Non-hosts see disabled games with clear "waiting for host" message
- If they somehow click, they get clear error message
- Host sees active games with confirmation they can select

Prevents confusing 403 errors and clarifies room permissions.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

apps/web/scripts/generate-build-info.js

@@ -24,7 +24,8 @@ function getBuildInfo() {
   const gitCommitShort = process.env.GIT_COMMIT_SHORT || exec('git rev-parse --short HEAD')
   const gitBranch = process.env.GIT_BRANCH || exec('git rev-parse --abbrev-ref HEAD')
   const gitTag = process.env.GIT_TAG || exec('git describe --tags --exact-match 2>/dev/null')
-  const gitDirty = process.env.GIT_DIRTY === 'true' || exec('git diff --quiet || echo "dirty"') === 'dirty'
+  const gitDirty =
+    process.env.GIT_DIRTY === 'true' || exec('git diff --quiet || echo "dirty"') === 'dirty'
 
   const packageJson = require('../package.json')