fix(tui): use sentence case for theme mode command palette items (#21192)

Co-authored-by: Aiden Cline <63023139+rekram1-node@users.noreply.github.com>

packages/opencode/src/cli/cmd/tui/app.tsx

@@ -672,7 +672,7 @@ function App(props: { onSnapshot?: () => Promise<string[]> }) {
       category: "System",
     },
     {
-      title: "Toggle Theme Mode",
+      title: "Toggle theme mode",
       value: "theme.switch_mode",
       onSelect: (dialog) => {
         setMode(mode() === "dark" ? "light" : "dark")
@@ -681,7 +681,7 @@ function App(props: { onSnapshot?: () => Promise<string[]> }) {
       category: "System",
     },
     {
-      title: locked() ? "Unlock Theme Mode" : "Lock Theme Mode",
+      title: locked() ? "Unlock theme mode" : "Lock theme mode",
       value: "theme.mode.lock",
       onSelect: (dialog) => {
         if (locked()) unlock()