56f624a073
- Add pluginToolbarStore for plugin toolbar item registration - Add PluginToolbar component (slim ribbon bar under TopBar) - Update AppShell to render PluginToolbar between TopBar and content - Mail page registers toolbar items (account select, search, compose, sync, settings) - Remove old mail top bar, use plugin toolbar instead - Fix mail response: arrays for addresses, add from_name/body_html/sanitized_html/date