Theme · Importing: VS Code themes read into Ely's palette, code palettes to choose

settings::read_vscode_theme reads a VS Code color theme, comments and
trailing commas and all: its type picks the mode, its colors and token
scopes name what they give, and the rest keep Ely's palette of that mode.
settings::ThemeImporter takes one dropped or browsed for, shows its name,
mode and count, and hands it over on Apply; a file that does not read
says why. theme::syntax_themes offers Ely's code colors, Quiet and Paper,
chosen through settings::SyntaxThemePicker, radio cards with a line of
code in each palette. A card's words now shrink as a plain block, so a
preview wraps inside the card at 280px.

src/settings/mod.rs

@@ -1,12 +1,15 @@
 mod advanced;
 mod appearance;
 mod editor;
+mod importer;
 mod network;
 mod preferences;
 mod search;
 mod section;
 mod shortcuts;
 mod storage;
+mod syntax;
+mod vscode;
 
 #[cfg(all(test, feature = "test-support"))]
 mod tests;
@@ -16,6 +19,7 @@ pub use appearance::{
     AccentColorPicker, Appearance, DensitySelector, FontSizeControl, ThemeSelector,
 };
 pub use editor::{ThemeDraft, ThemeEditor};
+pub use importer::ThemeImporter;
 pub use network::{Proxy, ProxySettings, manual};
 pub use preferences::{
     Notices, NotificationSettings, Privacy, PrivacySettings, Startup, StartupSettings,
@@ -24,3 +28,5 @@ pub use search::{SettingEntry, SettingsSearch, matching};
 pub use section::{SettingsLayout, SettingsRow, SettingsSection};
 pub use shortcuts::{KeyboardShortcutsList, Shortcut};
 pub use storage::{Changed, ImportExportSettings, ResetToDefault, StorageSettings, Store};
+pub use syntax::SyntaxThemePicker;
+pub use vscode::{VsCodeTheme, read_vscode_theme};