Adds 'Best match' sort button to the recipe browser. When selected, recipes are
ordered by the fraction of their ingredients that are in the user's pantry.
- store.py: _browse_by_match() pushes match_pct computation into SQL via json_each()
so ORDER BY can sort the full result set before LIMIT/OFFSET pagination
- recipes.py: extends sort pattern validation to accept 'match'; falls back to
default when no pantry_items provided
- RecipeBrowserPanel.vue: adds 'Best match' button (disabled when pantry empty);
watcher auto-engages match sort when pantry goes from empty to non-empty
pyr0ball
1ac7e3d76a