ci/ui-test: drop --with-deps now that runner is host-mode

`playwright install --with-deps` shells out to `sudo apt-get install`
for the system libraries that headless browsers need. In a job
container that runs as root this is silent; on a host-mode runner the
non-interactive sudo prompts for a password, fails three times, and
the step exits 1.

Drop --with-deps. The system .so libraries are installed once on the
host via `pnpm exec playwright install-deps` (or the equivalent
apt-get incantation); workflow runs only need to fetch the browser
binaries themselves, which lives under the runner user's home and
needs no privilege.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitea/workflows/ui-test.yaml

@@ -45,8 +45,15 @@ jobs:
         run: pnpm install --frozen-lockfile
 
       - name: Install Playwright browsers
+        # `--with-deps` would shell out to `sudo apt-get install` for
+        # the system .so libraries, which the host-mode runner cannot
+        # run non-interactively. The host has the deps installed once,
+        # globally; we only need to fetch the browser binaries here.
+        # If a future run fails with missing libraries, install them
+        # on the host via `pnpm exec playwright install-deps` (one
+        # shot, requires sudo).
         working-directory: ui/frontend
-        run: pnpm exec playwright install --with-deps
+        run: pnpm exec playwright install
 
       - name: Run Vitest
         working-directory: ui/frontend