feat: add Cmd+, keyboard shortcut to toggle settings (#319)

Add settings.toggle action with Cmd+, (Mac) / Ctrl+, (non-Mac) bindings.
When on a settings route, pressing the shortcut navigates back; otherwise
it pushes to the host settings route. Also adds comma to the shortcut
key map so the combo string parses correctly.

packages/app/src/keyboard/actions.ts

@@ -37,6 +37,7 @@ export type KeyboardActionId =
   | "sidebar.toggle.left"
   | "sidebar.toggle.right"
   | "sidebar.toggle.both"
+  | "settings.toggle"
   | "command-center.toggle"
   | "shortcuts.dialog.toggle"
   | "workspace.terminal.new"

packages/app/src/keyboard/keyboard-shortcuts.ts

@@ -712,6 +712,32 @@ const SHORTCUT_BINDINGS: readonly ShortcutBinding[] = [
     },
   },
 
+  // --- Settings toggle ---
+  {
+    id: "settings-toggle-cmd-comma-mac",
+    action: "settings.toggle",
+    combo: "Cmd+,",
+    when: { mac: true, commandCenter: false },
+    help: {
+      id: "toggle-settings",
+      section: "panels",
+      label: "Toggle settings",
+      keys: ["mod", ","],
+    },
+  },
+  {
+    id: "settings-toggle-ctrl-comma-non-mac",
+    action: "settings.toggle",
+    combo: "Ctrl+,",
+    when: { mac: false, commandCenter: false, terminal: false },
+    help: {
+      id: "toggle-settings",
+      section: "panels",
+      label: "Toggle settings",
+      keys: ["mod", ","],
+    },
+  },
+
   // --- Focus mode ---
   {
     id: "view-toggle-focus-cmd-shift-f-mac",

packages/app/src/keyboard/shortcut-string.ts

@@ -31,6 +31,7 @@ KEY_MAP["Digit"] = { code: "Digit" };
 KEY_MAP["\\"] = { code: "Backslash" };
 KEY_MAP["["] = { code: "BracketLeft", key: "[" };
 KEY_MAP["]"] = { code: "BracketRight", key: "]" };
+KEY_MAP[","] = { code: "Comma", key: "," };
 KEY_MAP["."] = { code: "Period", key: "." };
 KEY_MAP["`"] = { code: "Backquote", key: "`" };
 KEY_MAP["/"] = { code: "Slash" };