feat(ui): add session history navigation, permission keys, and review shortcuts

mod+alt+arrows step through this window's session-open history (or between
neighbouring tabs when session tabs are on), mod+k r renames the current
session inline, and mod+k a toggles permission auto-accept. Pending
permission cards respond to alt+enter / alt+shift+enter / alt+backspace with
the keys printed on the buttons. The commit message box commits on
mod+enter, alt+arrows step the diff review between changed files, and the
command palette gains search-only commands for rare actions so the initial
list stays short.

packages/ui/src/lib/shortcuts/config.ts

@@ -51,6 +51,34 @@ const SHORTCUT_GROUPS = {
       customizable: true,
       settingsLabelKey: 'settings.openchamber.keyboardShortcuts.action.new_chat.label',
     },
+    {
+      id: 'switch_session_previous',
+      defaultBinding: 'mod+alt+arrowleft',
+      customizable: true,
+      settingsLabelKey:
+        'settings.openchamber.keyboardShortcuts.action.switch_session_previous.label',
+    },
+    {
+      id: 'switch_session_next',
+      defaultBinding: 'mod+alt+arrowright',
+      customizable: true,
+      settingsLabelKey:
+        'settings.openchamber.keyboardShortcuts.action.switch_session_next.label',
+    },
+    {
+      id: 'rename_current_session',
+      defaultBinding: 'mod+k r',
+      customizable: true,
+      settingsLabelKey:
+        'settings.openchamber.keyboardShortcuts.action.rename_current_session.label',
+    },
+    {
+      id: 'toggle_permission_auto_accept',
+      defaultBinding: 'mod+k a',
+      customizable: true,
+      settingsLabelKey:
+        'settings.openchamber.keyboardShortcuts.action.toggle_permission_auto_accept.label',
+    },
     {
       id: 'close_session_tab',
       defaultBinding: 'alt+w',