App Intents: navigation App Shortcuts for the Jetpack app

[crazytonyli]

Description

This PR makes four common Jetpack actions available through Siri, Spotlight, and the Shortcuts app:

1. Create a new post.
2. Open Notifications.
3. Open Stats, optionally for a selected site.
4. Open the Reader.

These shortcuts are available only in the Jetpack app. The WordPress app is unchanged.

The new App Intent text and invocation phrases are English only for now. Existing translated strings are reused where they match.

Testing instructions

• Install the Jetpack app and sign in.
• In the Shortcuts app, verify that New Post, Notifications, Stats, and Reader are available for Jetpack.
• Run each shortcut and verify that it opens the expected screen.
• Run Open Stats with and without a selected site.
• Sign out, run one of the shortcuts, and verify that it reports that sign-in is required.

[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress by scanning the QR code below to install the corresponding build.

	App Name	WordPress
	Configuration	Release-Alpha
	Build Number	33707
	Version	PR #25754
	Bundle ID	org.wordpress.alpha
	Commit	eb25f1d
	Installation URL	6t9lckvt1q4d8

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack by scanning the QR code below to install the corresponding build.

	App Name	Jetpack
	Configuration	Release-Alpha
	Build Number	33707
	Version	PR #25754
	Bundle ID	com.jetpack.alpha
	Commit	eb25f1d
	Installation URL	0pk42vnlc6350

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[wpmobilebot]

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