Add reveal mode to the redaction tool

[apodacaduron]

Description

This PR adds a Reveal mode to the media redaction tool for workflows where users want to keep only selected content visible and black out everything else.

It also improves the redactor UX by:

• fixing box deletion and large drag behavior
• stabilizing zoom after viewport resize
• improving copy, translations, dark mode, and mobile behavior
• making mobile redactor view-only

How to test

1. Open the redaction tool on a media item.
2. In normal mode, draw, move, resize, and delete a box.
3. Save a redacted copy and confirm it works.
4. Create a new redaction and this time switch to Reveal mode, draw a visible area, save, and confirm everything else is blacked out.
5. Resize the viewport and confirm zoom still behaves correctly.
6. Check dark mode and mobile layout.

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