ci: fix bun install (no lockfile in repo, --frozen-lockfile unreliable)

There's no bun.lockb in the repo, so --frozen-lockfile fails
intermittently when pnpm cache is unavailable. Use plain bun install.

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

.gitea/workflows/ci.yml

@@ -117,7 +117,8 @@ jobs:
         run: |
           mkdir -p dist
           # bun needs a flat node_modules (pnpm's strict layout breaks resolution)
-          bun install --frozen-lockfile
+          # No bun.lockb in repo, so --frozen-lockfile is unreliable
+          bun install
           # Stub for optional dep that bun tries to resolve
           if [ ! -e node_modules/react-devtools-core ]; then
             ln -s ../src/cli/stubs/react-devtools-core node_modules/react-devtools-core