refactor: update keyboard shortcuts to prevent conflicts (#100)

Change Keyboard Shortcuts dialog shortcut from Cmd+H to Cmd+.
Update memory debug shortcut from Cmd+Shift+M to Cmd+Shift+D
Modify model selector shortcut to use Cmd+Shift+M

packages/desktop/src-tauri/src/main.rs

@@ -481,7 +481,7 @@ fn build_macos_menu<R: tauri::Runtime>(
         MENU_ITEM_TOGGLE_MEMORY_DEBUG_ID,
         "Toggle Memory Debug",
         true,
-        Some("Cmd+Shift+M"),
+        Some("Cmd+Shift+D"),
     )?;
 
     // Help menu items
@@ -490,7 +490,7 @@ fn build_macos_menu<R: tauri::Runtime>(
         MENU_ITEM_HELP_DIALOG_ID,
         "Keyboard Shortcuts",
         true,
-        Some("Cmd+H"),
+        Some("Cmd+."),
     )?;
 
     let download_logs = MenuItem::with_id(

packages/ui/src/App.tsx

@@ -157,7 +157,7 @@ function App({ apis }: AppProps) {
 
   React.useEffect(() => {
     const handleKeyDown = (e: KeyboardEvent) => {
-      if (hasModifier(e) && e.shiftKey && e.key === 'M') {
+      if (hasModifier(e) && e.shiftKey && e.key === 'D') {
         e.preventDefault();
         setShowMemoryDebug(prev => !prev);
       }

packages/ui/src/components/layout/Header.tsx

@@ -425,7 +425,7 @@ export const Header: React.FC = () => {
             </button>
           </TooltipTrigger>
           <TooltipContent>
-            <p>Keyboard Shortcuts ({getModifierLabel()}+H)</p>
+            <p>Keyboard Shortcuts ({getModifierLabel()}+.)</p>
           </TooltipContent>
         </Tooltip>
       </div>

packages/ui/src/components/ui/CommandPalette.tsx

@@ -137,7 +137,7 @@ export const CommandPalette: React.FC = () => {
           <CommandItem onSelect={handleShowHelp}>
             <RiQuestionLine className="mr-2 h-4 w-4" />
             <span>Keyboard Shortcuts</span>
-            <CommandShortcut>{getModifierLabel()} + H</CommandShortcut>
+            <CommandShortcut>{getModifierLabel()} + .</CommandShortcut>
           </CommandItem>
           <CommandItem onSelect={handleOpenDiffPanel}>
             <RiCodeLine className="mr-2 h-4 w-4" />

packages/ui/src/components/ui/HelpDialog.tsx

@@ -94,7 +94,7 @@ export const HelpDialog: React.FC = () => {
           icon: RiCommandLine,
         },
         {
-          keys: [`${mod} + H`],
+          keys: [`${mod} + .`],
           description: "Show Keyboard Shortcuts (this dialog)",
           icon: RiQuestionLine,
         },
@@ -104,7 +104,7 @@ export const HelpDialog: React.FC = () => {
           icon: RiLayoutLeftLine,
         },
         {
-          keys: [`${mod} + M`],
+          keys: [`Shift + ${mod} + M`],
           description: "Open Model Selector",
           icon: RiBrainAi3Line,
         },

packages/ui/src/hooks/useKeyboardShortcuts.ts

@@ -74,7 +74,7 @@ export const useKeyboardShortcuts = () => {
         return;
       }
 
-      if (hasModifier(e) && e.key === 'h') {
+      if (hasModifier(e) && e.key === '.') {
         e.preventDefault();
         toggleHelpDialog();
       }
@@ -145,8 +145,8 @@ export const useKeyboardShortcuts = () => {
         return;
       }
 
-      // Ctrl+M: Open model selector (same conditions as double-ESC: chat tab, no overlays)
-      if (hasModifier(e) && !e.shiftKey && e.key.toLowerCase() === 'm') {
+      // Cmd/Ctrl+Shift+M: Open model selector (same conditions as double-ESC: chat tab, no overlays)
+      if (hasModifier(e) && e.shiftKey && e.key.toLowerCase() === 'm') {
         const {
           isSettingsDialogOpen,
           isCommandPaletteOpen,