Windowed presentations

[jsade]

Summary

I needed a windowed presentation option for video calls, so added a new settings toggle and the necessary conditional presentation logic.

Full screen presentations must be explicitly disabled by the user via settings:

Implementation Details

• Added fullscreenPresentationEnabled setting (default true) with UI toggle and descriptive copy so presenters can disable automatic fullscreen.
• Presentation extension now tracks presentationUsesFullscreen per session, conditionally requesting fullscreen and setting up modal observer / onfullscreenchange only when fullscreen is requested.
• Escape key handling added to the wrapper onkeydown listener, invoking endPresentation even in windowed mode; endPresentation now early-returns when already exited to avoid double teardown.
• Wrapped fullscreen request in try/catch to gracefully fall back to windowed mode in the unlikely event the browser blocks fullscreen, and updated teardown logic to skip fullscreen cleanup when already windowed.

How to Test

1. Ensure Enter fullscreen while presenting is enabled, start a presentation, confirm Obsidian requests fullscreen and ESC exits both fullscreen and presentation cleanly.
2. Disable Enter fullscreen while presenting, start a presentation, confirm canvas stays windowed, keyboard navigation still works, and exiting with ESC or the End Presentation command restores canvas state.
3. Simulate requestFullscreen rejection (this is somewhat tricky to test and a corner case, but e.g. in devtools you can temporarily override the wrapper’s requestFullscreen to throw) and start a presentation; verify it remains windowed, Escape still exits, and teardown has no errors.

[Developer-Mike]

Thank you for your PR. I'll take a look at it hopefully by next weekend.

I'm sorry for the copilot stuff. I've never enabled anything related to it. Crazy how they shove it down your throat 😕.

[jsade]

Eh, I think the copilot review might've been triggered by my default settings which I didn't adjust for this repo, so can only blame myself 😅

No rush with the review though, thanks!

[Developer-Mike]

Changes can be made by me 👍🏻. Thank you for your PR!