Sync ShopStack 2026-06-15 round 2: primary-nav More, undo bar, freshness stamps, safe_render_html, home-flow TabContext

Sync ShopStack HEAD f5f6237

Sync ShopStack HEAD 8073e3e + 2026-06-15 audit/implementation docs

Sync ShopStack 2026-06-15: corrections panel, empty-state rewrite, market-source suppression

Fix PWA route re-mount after Gradio launch

Sync ShopStack HEAD 6f8adfc

upload app.py

Upload folder using huggingface_hub