Give users without stored appearance choices the Nostalgia style and teal accent while preserving saved selections and BookOrbit styling on standalone pages.
Remove AppHeader. The sidebar gains a Search row that opens a Cmd+K palette (books, authors,
series, places, settings pages and actions), a utility dock above the footer, and a Reading
group below the lists. Every page opens with a shared PageTitleRow; phones without one get a
slim bar. Settings headers gain a full description, and the top glow defaults to 50% with one
reach and strength for every style. The Appearance panel opens past the sidebar, reorders its
controls and names the current pick, and keeps each pastel accent under its vivid one.
Add a Style setting beside mode, accent, radius and background. Nostalgia restyles the app through
tokens only (neutral surface palettes, system type, flat shell, top glow) and pins background,
opacity and brightness. Add a top glow reach slider for both styles. Tidy the theme layer first:
charts read live tokens, bare `rounded` follows the radius scale, one shared sign-in toolbar.
Also carries the settings page header redesign.
Add system preference option for appearance theme with auto-switching based on OS color scheme settings. Update default theme preference to system and listen for OS dark mode changes dynamically.
Closes#695
neon