Fix: /admin/content is nu boom-editor + image-grootte knop + custom syntax

- /admin/content is nu de boom-editor (plugin-file-tree structuur),
  consistent met plugin- en thema-editors. Oude tabelweergave verhuisd
  naar /admin/content-list, bereikbaar via 'Boom weergave'/'Lijst
  weergave' knoppen. /admin/content-files redirect naar /admin/content.
- Image-grootte knop in markdown editor-toolbar: selecteer ![alt](url),
  klik knop, breedte/hoogte dialog, {:width=... height=...} syntax
  toevoegen/vervangen. Bestaande waarden worden in prompts getoond.
- Custom-grootte syntax {:width=...} nu ook correct herschreven naar
  /-media/ endpoint (was alleen gewone ![alt](url) herschreven).
- Handleidingen bijgewerkt (content-beheer.md NL+EN: boom/lijst
  weergave uitleg + image-grootte + images in content sectie)
- Release notes v2.6.2 bijgewerkt
- Pentest 30/30, WCAG 25/25

guide/en/admin-beheerder/content-beheer.md

@@ -2,12 +2,12 @@
 
 CodePress offers two views for content management:
 
-1. **List view** (`/admin/content`) — classic table with filter, upload, new folder/file per folder
-2. **Content editor** (`/admin/content-files`) — file browser sidebar + CodeMirror editor (uniform with plugin/theme editors)
+1. **Tree view** (`/admin/content`) — default, file browser sidebar + CodeMirror editor (uniform with plugin/theme editors)
+2. **List view** (`/admin/content-list`) — classic table with filter, upload, new folder/file per folder
 
-Both work side-by-side and use the same content directory. The content editor offers the same functionality as the list view, but with a nested file-tree sidebar like the plugin and theme editors — for a consistent editor experience.
+Both work side-by-side and use the same content directory. Switch between views via the "List view"/"Tree view" buttons at the top right. The tree view offers the same functionality as the list view, but with a nested file-tree sidebar like the plugin and theme editors — for a consistent editor experience.
 
-## Content editor (content-files)
+## Tree view (content)
 
 ### File browser sidebar
 - Shows the nested file tree of `content/`
@@ -19,6 +19,23 @@ Both work side-by-side and use the same content directory. The content editor of
 ### Editable file types
 `.md` (Markdown), `.php` (PHP), `.html` (HTML) — consistent with the existing content-edit page.
 
+### Set image size (Markdown)
+The markdown editor toolbar has an "Image size" button (expand icon):
+1. Select an image in the editor in markdown format `![alt](url)`
+2. Click the "Image size" button
+3. Enter width and/or height (px or %, empty = don't set)
+4. The `{:width=... height=...}` syntax is added to or replaced on the image
+
+Example:
+```markdown
+![logo](/content/_images/logo.png){:width="200" height="100"}
+```
+
+Existing `{:width=...}` values are shown in the prompts. The size attributes are rendered as `width`/`height` HTML attributes on the `<img>` tag in the frontend.
+
+### Images in content
+Images in `content/` are served via the `/-media/` endpoint (content/ lives outside the webroot). Markdown syntax `![alt](url)` with local URLs (relative like `image.jpg`, or absolute like `/content/_images/image.jpg`) is automatically rewritten to `/-media/...`. External URLs (`https://...`) are left untouched.
+
 ### Create a new file
 - Click **New file** (at the top or per folder in the sidebar)
 - Enter a path within content (e.g. `en.page` or `blog/en.post`)