ci(dashboard): add biome lint check to CI workflow

Run `pnpm lint:check` before build to catch format and import issues early.
Biome's noUnusedVariables is disabled for Vue files since biome cannot
detect variables used in <template> blocks.

.github/workflows/dashboard_ci.yml

@@ -30,6 +30,7 @@ jobs:
         working-directory: dashboard
         run: |
           pnpm install --frozen-lockfile
+          pnpm lint:check
           pnpm run build
 
       - name: Inject Commit SHA