Problem
Several layout issues on mobile viewports:
Calendar in `/daily` is `hidden md:block` with no fallback — users can't navigate dates on mobile
Entry detail metadata sidebar (64px fixed) and split pane overflow on small screens
Entries toolbar buttons overflow on narrow viewports (identified in ux-accessibility-fixes)Solution
Add a compact date picker or inline date nav for mobile daily notes
Make entry detail metadata collapsible or move to a tab on mobile
Add `flex-wrap` to entries toolbar
Test all routes at 360px viewport width