Add "page" extension type for full-screen Canvas extensions

Lauri Timmaneerequested to merge
issue/canvas-3591662:3591662-add-page-extension-type-for-full-screen-canvas-extensions into 1.x

AI Generated: Yes, Claude Code was used to assist with the creation of this MR.

Testing instructions

  • Install canvas_test_extension_page module
  • You should see a page extension in the left sidebar menu below "Extensions" link
  • Clicking the page extension should open a full-screen extension

Closes #3591662

Edited by Lauri Timmanee

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