feat(app): make the New tab launcher keyboard-first

Cmd/Ctrl+T now opens the focused pane's launcher, while explicit target shortcuts bypass the menu. Dispatcher ownership is scoped to the app tree so retained workspaces cannot intercept commands.

packages/app/src/utils/format-shortcut.ts

@@ -27,22 +27,18 @@ export function formatShortcut(keys: ShortcutKey[], os: ShortcutOs): string {
     const order = ["ctrl", "alt", "shift", "mod", "meta"];
     const symbols: Record<string, string> = {
       mod: "⌘",
+      shift: "⇧",
       alt: "⌥",
       ctrl: "⌃",
       meta: "⌘",
     };
 
     const modifierSet = new Set(normalized);
-    const mods = order
-      .filter((k) => modifierSet.has(k))
-      .map((k) => (k === "shift" ? "Shift" : (symbols[k] ?? "")));
+    const mods = order.filter((k) => modifierSet.has(k)).map((k) => symbols[k] ?? "");
     const main = normalized
       .filter((k) => !order.includes(k))
       .map(normalizeKey)
       .join("");
-    if (mods.includes("Shift")) {
-      return [...mods, main].filter(Boolean).join("+");
-    }
     return `${mods.join("")}${main}`;
   }