feat: align terminal font settings with appearance fonts

- Terminal font dropdown now uses mono fonts from UI font options
- Unified font list between appearance section and terminal settings
- Terminal font persisted to GlobalSettings for import/export support
- Aligned global terminal settings popover with per-terminal popover:
  - Same settings in same order (Font Size, Run on New Terminal, Font Family, Scrollback, Line Height, Screen Reader)
  - Consistent styling (Radix Select instead of native select)
- Added terminal padding (12px vertical, 16px horizontal) for readability

apps/ui/src/hooks/use-settings-migration.ts

@@ -600,6 +600,13 @@ export function hydrateStoreFromSettings(settings: GlobalSettings): void {
     worktreePanelCollapsed: settings.worktreePanelCollapsed ?? false,
     lastProjectDir: settings.lastProjectDir ?? '',
     recentFolders: settings.recentFolders ?? [],
+    // Terminal font (nested in terminalState)
+    ...(settings.terminalFontFamily && {
+      terminalState: {
+        ...current.terminalState,
+        fontFamily: settings.terminalFontFamily,
+      },
+    }),
   });
 
   // Hydrate setup wizard state from global settings (API-backed)
@@ -653,6 +660,7 @@ function buildSettingsUpdateFromStore(): Record<string, unknown> {
     worktreePanelCollapsed: state.worktreePanelCollapsed,
     lastProjectDir: state.lastProjectDir,
     recentFolders: state.recentFolders,
+    terminalFontFamily: state.terminalState.fontFamily,
   };
 }