fix(ci): Separate cd and build commands, add step-by-step verification

- Separate cd, pnpm install, and pnpm build into explicit steps
- Return to repo root before copy operation
- Use absolute paths from repo root
- Add echo statements between each major step for debugging
- Add verification check for index.html existence
- Remove variable substitution for clarity

This approach maximizes visibility into which exact step is failing,
making debugging and root cause analysis much easier.

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

.gitea/workflows/ci.yml

@@ -114,13 +114,16 @@ jobs:
 
       - name: Build frontend into Host static assets
         run: |
-          cd frontend && pnpm install --frozen-lockfile && pnpm build
-          wwwroot="../src/KArtSell.Host/wwwroot"
-          [ -d "$wwwroot" ] && rm -rf "$wwwroot"
-          mkdir -p "$wwwroot"
-          cp -r dist/* "$wwwroot/"
+          cd frontend
+          pnpm install --frozen-lockfile
+          pnpm build
+          echo "✅ Vite build completed"
+          cd ..
+          rm -rf src/KArtSell.Host/wwwroot
+          mkdir -p src/KArtSell.Host/wwwroot
+          cp -r frontend/dist/* src/KArtSell.Host/wwwroot/
           echo "✅ Frontend assets copied to Host wwwroot"
-          ls -la "$wwwroot" 2>/dev/null | head -5 || echo "wwwroot contents verified"
+          [ -f src/KArtSell.Host/wwwroot/index.html ] && echo "✅ index.html verified" || echo "⚠️ index.html not found"
 
       - name: Publish Release Build
         run: |