fix: new window creation, IPC routing, and native shortcuts

[mattdanielmurphy]

Description

Fixes issues where the "New Window" action failed to correctly spawn OS-level windows in Tauri and prevented newly spawned windows from accessing IPC capabilities.

Changes

• main.ts: Modified workspaceProvider.open to handle reuse: false correctly by calling Tauri's create_window IPC command natively, instead of merely updating the window location.
• default.json: Expanded IPC capability windows mask to ["*"] so dynamically spawned windows correctly inherit IPC permissions from the main window.
• lib.rs:
  • Re-wired native menu dispatcher to route events to the is_focused window instead of hardcoding "main".
  • Updated window_menu to use tauri::menu::WINDOW_SUBMENU_ID to signal to macOS to properly attach native window menu behaviors.
  • Explicitly bound a Cycle Through Windows command to `CmdOrCtrl+`` to preempt aggressive webview event-swallowing, allowing predictable cross-window cycling natively via Rust.

Testing

• Spawning a "New Window" creates a completely separate Tauri window.
• Menu actions (like Open File) execute accurately in the actively focused window.
• Shortcuts like `Cmd+`` effectively cycle between instances natively without frontend interference.