fix(ux): prevent iOS auto-zoom on inputs + lazy-load page CSS

Increase font-size to 16px on mobile for shopping quick-add inputs,
notes search, and contacts search. Desktop breakpoint restores compact
sizes. Move 9 page-specific stylesheets from index.html to on-demand
loading in router.js, reducing initial CSS payload.

CHANGELOG.md

@@ -7,6 +7,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.7.3] - 2026-04-04
+
+### Accessibility
+- Increase font-size to 16px (`--text-md`) on mobile for `quick-add__input`, `quick-add__qty`, `quick-add__cat` (shopping), `notes-toolbar__search-input`, and `contacts-toolbar__search-input` - prevents iOS auto-zoom on input focus (WCAG touch-friendly inputs)
+
+### Performance
+- Lazy-load page-specific stylesheets on route change instead of loading all 10 upfront in `index.html` - reduces initial CSS payload; only tokens, reset, pwa, layout, and login styles are render-blocking
+
 ## [0.7.2] - 2026-04-04
 
 ### Accessibility