fix(ci): Robust wwwroot copy with proper error handling

- Add set -e for fail-on-error semantics
- Remove entire wwwroot directory (rm -rf) then recreate it fresh
- Use environment variable for wwwroot path clarity
- Use dist/* instead of dist/. for better compatibility
- Add clear diagnostic output with echo statements
- Improved robustness for CI/CD edge cases

This addresses the persistent "Build frontend into Host static assets"
failure by ensuring the directory exists and is properly cleaned/populated.

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

.gitea/workflows/ci.yml

@@ -117,12 +117,15 @@ jobs:
         # CURRENT_ROADMAP.md item #3) -- this release zip must build them fresh,
         # the same way .gitea/workflows/deploy.yml does for production.
         run: |
+          set -e
           pnpm install --frozen-lockfile
           pnpm build
-          mkdir -p ../src/KArtSell.Host/wwwroot
-          rm -rf ../src/KArtSell.Host/wwwroot/*
-          cp -R dist/. ../src/KArtSell.Host/wwwroot/
-          ls -la ../src/KArtSell.Host/wwwroot/ | head -20
+          WWWROOT_DIR="../src/KArtSell.Host/wwwroot"
+          rm -rf "$WWWROOT_DIR"
+          mkdir -p "$WWWROOT_DIR"
+          cp -R dist/* "$WWWROOT_DIR/"
+          echo "Frontend assets copied to Host wwwroot:"
+          ls -la "$WWWROOT_DIR" | head -20
         working-directory: frontend
 
       - name: Publish Release Build