feat: add "Restore macOS Terminal as Default" functionality

[jiakeboge]

Description

This PR implements the functionality to unset Warp as the default terminal. Currently, setting Warp as the default terminal is a one-way operation. This change allows users to easily revert the default terminal setting back to the macOS system Terminal (com.apple.Terminal).

The implementation includes:

• A new platform-specific function for macOS to restore the default role handler to Terminal.app.
• A dynamic menu item that toggles between "Set Warp as Default Terminal" and "Restore macOS Terminal as Default" based on the current state.
• An updated Features settings page that provides a link to restore the default terminal when Warp is currently set as default.

Linked Issue

• The linked issue is labeled ready-to-spec or ready-to-implement.
• Screenshots or a short video of the implementation are included below.

Screenshots / Videos

• [Menu Bar Toggle Demonstration]
• [Settings Page Link Update]

Testing

• Manual Testing: Verified on macOS that clicking "Set Warp as Default Terminal" correctly updates the system setting, and the menu item subsequently changes to "Restore macOS Terminal as Default". Clicking the restore option correctly sets the default back to Terminal.app.
• Unit Testing: Updated the DefaultTerminal model to ensure the is_warp_default state is correctly updated when the restore action is triggered.
• Cross-platform: Verified that the logic correctly fallbacks to "Not implemented" on non-macOS platforms.

Agent Mode

• Warp Agent Mode - This PR was created via Warp's AI Agent Mode

Changelog Entries for Stable

CHANGELOG-IMPROVEMENT: Added the ability to restore the macOS system Terminal as the default terminal from the Warp menu and settings page.

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@jiakeboge

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[oz-for-oss]

Overview

This PR adds a macOS restore path for the default terminal handler, updates the app menu to toggle between setting Warp and restoring Terminal.app, and adds a matching settings-page action.

Concerns

No important correctness or security concerns were identified in the changed diff.

Verdict

Found: 0 critical, 0 important, 0 suggestions

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