fix(ci): move --ignore-workspace before the script name

`pnpm build --ignore-workspace` forwards --ignore-workspace as an arg
to the underlying `vite build` invocation, which errors out with
`Unknown option --ignoreWorkspace`. To treat it as a pnpm flag it has
to precede the subcommand: `pnpm --ignore-workspace run build`.

This bug was inherited unchanged from main during PR #22 conflict
resolution; confirmed reproducible locally (vite 5.4.21, pnpm 10.33.0).

Author: claude

.github/workflows/ci.yml

@@ -70,4 +70,4 @@ jobs:
         run: pnpm install --frozen-lockfile --ignore-workspace
 
       - name: Build (tsc --noEmit + vite build)
-        run: pnpm build --ignore-workspace
+        run: pnpm --ignore-workspace run build