Fix native binding error: use npm install instead of npm ci

@tailwindcss/oxide has platform-specific native bindings. The
package-lock.json was generated on a different platform, so npm ci
installs the wrong native binary. Switching to rm -rf node_modules
+ npm install lets npm resolve the correct platform-specific
optional dependency (e.g., @tailwindcss/oxide-linux-x64-gnu on
Linux, oxide-darwin-arm64 on macOS).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitea/workflows/build-app.yml

@@ -87,7 +87,9 @@ jobs:
 
       - name: Install frontend dependencies
         working-directory: ./app
-        run: npm ci
+        run: |
+          rm -rf node_modules
+          npm install
 
       - name: Install Tauri CLI
         working-directory: ./app
@@ -187,7 +189,9 @@ jobs:
 
       - name: Install frontend dependencies
         working-directory: ./app
-        run: npm ci
+        run: |
+          rm -rf node_modules
+          npm install
 
       - name: Install Tauri CLI
         working-directory: ./app