Preserve active formats when applying annotations.

[maxschmeling]

What?

Fixes #71698

Preserve active formatting during programmatic annotation changes.

Why?

See the original report in #71698.

When typing with active formatting, programmatic changes to the annotations would cause active formats to be lost.

How?

Filters out annotation formats (editor-only) from activeFormats in getActiveFormats and related code paths, and preserves user activeFormats (e.g., bold) when annotations are applied programmatically, so annotations don't interfere with typing.

Testing Instructions

Instructions copied from the original issue:

1. Using word-example.js from the gist
2. enable bold formatting in a paragraph
3. start typing words
4. Type the word apple
5. continue typing
6. see that bold has been disabled after the word apple

---

1. Using shortcut-example.js
2. Create a paragraph with some text
3. hit mod+shift+L
4. The whole paragraph should be annotated now in the centre of the annotation
5. Enable bold by clicking the tool bar
6. type two letters
7. the first will be bold the second will not

Testing Instructions for Keyboard

This change is entirely about typing in editable areas.

Screenshots or screencast

before.mp4

after.mp4

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