Add notice to switch from legacy template mode to automatic mode

[pfefferle]

Fixes #2984

Proposed changes:

• When users have the legacy template mode (note) active, a notice is now shown directly in the "Post content" settings field with a button to switch to automatic mode.
• Previously, users had to enable the Advanced Settings tab and manually uncheck the "Use Template Tags" option — which was not discoverable.

Screenshot

Other information:

• Have you written new tests for your changes, if applicable?

Testing instructions:

• Set the activitypub_object_type option to note (either via WP-CLI: wp option update activitypub_object_type note, or via the Advanced Settings tab).
• Go to Settings → ActivityPub → Settings tab.
• Verify a notice appears in the "Post content" field explaining the legacy template mode, with a "Switch to Automatic Mode" button.
• Click the button.
• Verify the page reloads, the notice and template textarea are gone, and the option is set back to wordpress-post-format.

Changelog entry

• Automatically create a changelog entry from the details below.

Changelog Entry Details

Significance

• Patch

Type

• Added - for new features

Message

Add a notice on the Settings page to easily switch from legacy template mode to automatic mode.

[Copilot]

Pull request overview

Adds an in-context notice on the ActivityPub Settings screen to help users switch from legacy template mode to automatic mode.

Changes:

• Add a new settings-page load handler that switches activitypub_object_type back to the default when a nonce-protected query arg is present.
• Render a notice + “Switch to Automatic Mode” action within the “Post content” settings field.
• Add a changelog entry describing the new settings UX.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
includes/wp-admin/class-settings.php	Adds a load hook handler to process the “switch to automatic mode” action and redirect back to settings.
includes/wp-admin/class-settings-fields.php	Renders a warning + action link in the post content setting UI.
.github/changelog/2985-from-description	Documents the patch-level addition in the changelog.

Comments suppressed due to low confidence (1)

includes/wp-admin/class-settings-fields.php:267

• The “⚠” symbol is embedded in the translatable string and may be announced verbosely by screen readers, and it can be awkward for translators. Prefer using semantic markup (e.g., a styled notice container, or an icon element with aria-hidden="true" plus separate screen-reader text) instead of including the symbol directly in the localized message.

			<?php \esc_html_e( '⚠ You are using the legacy template system to format your posts for the fediverse. We recommend switching to automatic mode, which intelligently chooses the best format for each post.', 'activitypub' ); ?>