ui: restore Ctrl+B sidebar toggle shortcut (#25307)

tools/ui/src/lib/components/app/navigation/SidebarNavigation/SidebarNavigation.svelte

@@ -27,7 +27,10 @@
 
 	let { onSearchClick = () => {} }: Props = $props();
 
-	const { handleKeydown } = useKeyboardShortcuts({ activateSearchMode: () => onSearchClick() });
+	const { handleKeydown } = useKeyboardShortcuts({
+		activateSearchMode: () => onSearchClick(),
+		toggleSidebar: () => toggleExpandedMode()
+	});
 
 	let isExpandedMode = $state(false);
 	let hoveredTooltip = $state<string | null>(null);

tools/ui/src/lib/enums/keyboard.enums.ts

@@ -9,6 +9,7 @@ export enum KeyboardKey {
 	ARROW_LEFT = 'ArrowLeft',
 	ARROW_RIGHT = 'ArrowRight',
 	TAB = 'Tab',
+	B_LOWER = 'b',
 	D_LOWER = 'd',
 	D_UPPER = 'D',
 	E_UPPER = 'E',

tools/ui/src/lib/hooks/use-keyboard-shortcuts.svelte.ts

@@ -9,6 +9,7 @@ interface KeyboardShortcutsCallbacks {
 	deleteActiveConversation?: () => void;
 	navigateToPrevConversation?: () => void;
 	navigateToNextConversation?: () => void;
+	toggleSidebar?: () => void;
 }
 
 export function useKeyboardShortcuts(callbacks: KeyboardShortcutsCallbacks) {
@@ -21,6 +22,11 @@ export function useKeyboardShortcuts(callbacks: KeyboardShortcutsCallbacks) {
 			callbacks.onSearchActivated?.();
 		}
 
+		if (isCmdOrCtrl && event.key === KeyboardKey.B_LOWER) {
+			event.preventDefault();
+			callbacks.toggleSidebar?.();
+		}
+
 		if (
 			isCmdOrCtrl &&
 			event.shiftKey &&