## Description
This PR refactors content mode property restrictions to use a
declarative, component-based configuration approach. Instead of
maintaining hardcoded lists of editable properties in a central
location, each component now declares which of its properties should be
editable in content mode via the `contentMode: boolean` flag in
PropMeta.
### Content Mode Properties Added:
| Component | Properties |
|-----------|-----------|
| Image | src, width, height, alt |
| Video | src, width, height |
| YouTube | url |
| Vimeo | url |
| Vimeo Preview Image | src |
| Link | href |
| Markdown Embed | code |
## Steps for reproduction
1. Create a project and share it with editor-only access
2. Switch to content edit mode
3. Select a YouTube or Vimeo component on the canvas
4. In the Properties panel, the `url` property should now be visible and
editable
5. Modify the YouTube/Vimeo URL and verify it updates correctly
## Code Review
- [ ] hi @kof, I need you to do
- conceptual review (architecture, feature-correctness)
- detailed review (read every line)
- test it on preview
## Before requesting a review
- [x] made a self-review
- [x] added inline comments where things may be not obvious (the "why",
not "what")
## Before merging
- [x] tested locally and on preview environment (preview dev login:
0000)
- [ ] updated [test
cases](https://github.com/webstudio-is/webstudio/blob/main/apps/builder/docs/test-cases.md)
document
- [ ] added tests
- [ ] if any new env variables are added, added them to `.env` file
---------
Co-authored-by: shreyanshkotak <sk7739@nyu.edu>
