Persistent admin notice to install or activate Kindling Blocks when the theme is activated.

[EugeneKyale]

This PR adds a lightweight, dependency-free flow in the Kindling theme that prompts admins to install and activate Kindling Blocks. The notice persists until the plugin is active and supports a one-click install from a private ZIP endpoint with automatic activation.

What changed

• Added an admin notice rendered on admin_notices for users who can install plugins

• If the plugin is missing, the primary action routes to an admin-post handler that downloads the private ZIP and runs Plugin_Upgrader then activates the plugin

• If the plugin is installed but inactive, the primary action activates it directly

• Added success and error result notices after redirects

• Introduced two filters for URLs:

  • kindling_blocks_package_url to override the ZIP location (supports signed links)
  • kindling_blocks_learn_more_url for a secondary link to marketing or docs

How to test

1. Activate Kindling on a site without Kindling Blocks.

2. Confirm the notice appears on any admin screen.

3. Click Install Kindling Blocks.

   • If file system creds are needed, enter them.
   • On success, confirm a success notice and that the plugin is active.

4. Deactivate the plugin and refresh.

   • Notice should reappear with Activate button.
   • Click Activate and confirm activation succeeds.

5. Override the package URL using:

   add_filter( 'kindling_blocks_package_url', function( $url ) {
     return 'https://kindlingwp.com/plugins/kindling-blocks/signed-link.zip';
   } );

   Confirm the installer uses the new URL.

Acceptance Criteria

• Notice persists until the plugin is active
• Install path downloads and activates from private ZIP
• Activation path works when the plugin is installed but inactive
• Errors are surfaced in admin notices
• URLs are filterable
• Code follows WP standards and respects capabilities

Security and privacy

• Nonces on all actions
• install_plugins capability required
• Inputs sanitized and outputs escaped
• No tokens or secrets in code. Use filters for signed links

Screenshots

• Notice with Install button

• Notice with Activate button

• Success

• Error

Related

• Closes: Add persistent admin notice to install/activate Kindling Blocks from private ZIP #81