Theme selection across light and dark modes is now persisted by name
instead of numeric ID. A shared registry (constants/themes.ts) owns the
single source of truth for all predefined theme definitions, and
utils/themeManager.ts provides a central applyCurrentTheme() /
applyThemeForMode() API that replaces scattered inline resolution logic
in App.vue and PredefinedThemes.vue. Custom themes continue to store
their hex color as the source of truth, marked with the
CUSTOM_THEME_NAME sentinel.
The theme drawer is redesigned: a segmented Light/Dark toggle replaces
the tabs, each theme is a single clickable row (no per-row Apply
button), the applied theme is highlighted with a primary ring plus an
Applied badge, long names truncate instead of wrapping, and the custom
color row opens the picker with an Apply/Cancel dialog.
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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>