Doc: Add release notes for v3.4 (#13273)

readme/news/20250922-release-3-4.md

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+# What's new in Joplin 3.4?
+
+Joplin 3.4 includes many bug fixes and improvements, with a focus on the mobile app.
+
+## Mobile
+
+### Rich Text Editor
+
+The mobile app now includes a beta [Rich Text Editor](https://joplinapp.org/help/apps/rich_text_editor)! The new editor renders formatting/math/images within the editor:
+
+
+<img src="/images/news/20250922-mobile-rte.png" width="400" alt="screenshot: Mobile Rich Text Editor editing the welcome notes. Images, headings, etc are rendering."/>
+
+To try it, 1) open a note in the default Markdown editor 2) open the note actions menu (the three vertical dots) for the note and 3) click “Edit as Rich Text”.
+
+Be aware that this editor is still in active development and [has a number of known limitations and issues](https://github.com/laurent22/joplin/issues/12840). The Rich Text editor is based on [ProseMirror](https://prosemirror.net/) and will behave differently from the desktop Rich Text Editor in many cases.
+
+
+### Support for publishing notes with Joplin Cloud and Server
+
+It's now possible to [publish notes](https://joplinapp.org/help/apps/publish_note) from the mobile app! To do so, open the “Properties” menu for a note, then click “Publish/unpublish”:
+
+![screenshot: A Publish/unpublish note action is shown in the "Note properties" sidebar, just below a "Previous versions" button](/images/news/20250922-publish-notes.png)
+
+Next, in the “publish note” dialog, click “Copy shareable link”. Notes can later be unpublished by clicking "Unpublish" in the publication dialog.
+
+### Viewing note history
+
+It is now possible to view and restore previous note versions from the mobile app. Like the "publish note" feature, previous note versions can be accessed from the note properties menu.
+
+![screenshot: The note history page](/images/news/20250922-note-history.png)
+
+As on desktop, the note history feature can be configured from the “Note History” tab in settings.
+
+### Updated tag dialog
+
+The tag dialog has been redesigned, with a new UI for adding, removing, and creating new tags:  
+<img src="/images/news/20250922-tag-editor.png" width="500" alt="screenshot: Tag dialog now consists of three sections: Added tags, Add new tags, Actions."/>
+
+### Android: Improved voice typing
+
+The voice typing feature on Android has been updated with [improved silence detection](https://github.com/laurent22/joplin/pull/12404) and a new “[custom glossary](https://github.com/laurent22/joplin/pull/12370)” setting. Voice typing also now [defaults to a more accurate (but somewhat slower) model](https://github.com/laurent22/joplin/pull/12352).
+
+### Quickly creating a note from multiple photos
+
+A “scan notebook” action has been added to the “New note” menu:
+
+<img src="/images/news/20250922-scan-notebook.png" width="500"/>
+
+This action allows quickly creating a new note with multiple pictures taken from the camera.
+
+## Desktop
+
+### More Markdown Editor settings
+
+The "Note" tab in settings now includes new settings for the Markdown editor, including:
+- An option to render headers, lists, and certain other formatting within the editor.
+- An option to render images in the editor.
+
+When enabled, these settings bring the Markdown editor closer to the Rich Text Editor, without [some of the Rich Text Editor's limitations](https://joplinapp.org/help/apps/rich_text_editor).
+
+These settings are also available on mobile.
+
+### Smaller application size and faster startup
+
+We've made the desktop application roughly 33% smaller! In addition to faster application startup, this means that the desktop app should be faster to download take up less space.
+
+| Joplin version         | Previous size (v3.3.13) | New size (v3.4.12) |
+|------------------------|-------------------------|----------------------|
+| Joplin for MacOS (ARM)         | 211 MB          | 141 MB |
+| Joplin for Windows (installer) | 321 MB          | 219 MB |
+| Joplin for Windows (portable)  | 320 MB          | 219 MB |
+| Joplin for Linux (AppImage)    | 219 MB          | 147 MB |
+
+
+## Terminal app
+
+### Collapsible folders
+
+The [terminal application](https://joplinapp.org/help/apps/terminal/) now supports expanding and collapsing folders by pressing <kbd>z</kbd>. For additional information, see [the original pull request](https://github.com/laurent22/joplin/pull/12718).
+
+### Managing shared notebooks and published notes
+
+New commands have been added to the terminal app, including `publish`, `unpublish`, and `share`. This allows the terminal app to manage shared folders and published notes.
+
+## Bug fixes
+
+For the full list of changes, see [the desktop changelog](https://joplinapp.org/help/about/changelog/desktop/) and [the mobile changelog](https://joplinapp.org/help/about/changelog/android/).