fix: install Playwright browsers from lockfile-pinned version in CI

bunx always downloads a fresh playwright package from npm, ignoring
node_modules. npx couldn't find the binary either because bun's
hoisting layout differs from npm's. Fix by invoking the local binary
directly from packages/app/node_modules/.bin/playwright, which is the
lockfile-pinned @playwright/test@1.57.0 and downloads the correct
browser versions.

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

Author: pRizz

.github/workflows/ci.yml

@@ -340,9 +340,13 @@ jobs:
           key: ${{ runner.os }}-playwright-${{ hashFiles('packages/opencode/packages/app/package.json') }}
           restore-keys: ${{ runner.os }}-playwright-
 
+      - name: Install opencode dependencies
+        working-directory: packages/opencode
+        run: bun install --frozen-lockfile --ignore-scripts
+
       - name: Install Playwright browsers
         working-directory: packages/opencode/packages/app
-        run: bunx playwright install --with-deps
+        run: ./node_modules/.bin/playwright install --with-deps
         env:
           PLAYWRIGHT_BROWSERS_PATH: ${{ github.workspace }}/.cache/ms-playwright