Add tag filter chips to menu page

## Goal
Above the menu grid, render a chip per tag derived from the foods list. Clicking a chip filters the grid to that tag; clicking the active chip clears the filter.

## Acceptance criteria
- [ ] Tag chips render dynamically from current foods
- [ ] Active chip is visually distinct
- [ ] Selecting a chip filters cards; clearing returns to the full list
- [ ] State lives in the menu page (not a global store)