TINYDOC-3570 - TinyMCE 8.9 Release Documentation and Community Changelog - #4305

* TINYDOC-3569: TinyMCE 8.9.0 Release Documentation.

* TINYDOC-3570 - TinyMCE 8.9 Release Documentation and Community Changelog (#4305)

* TINYDOC-3570 - Populate TinyMCE 8.9.0 release date

* TINYDOC-3570: Opening or closing a sidebar from the toolbar scrolled the editor to the selection. (#4324)

* TINYDOC-3570: The Help dialog lists plugins with invalid metadata as plain text. (#4323)

* TINYDOC-3570: Scroll position is preserved between the editor content and the AI preview. (#4322)

* TINYDOC-3570: The tinymceai_chat_fetch_sources option can now nominate default sources for chat conversations. (#4318)

* TINYDOC-3570 - Add the tinymceai_chat_default_sources option and its 8.9.0 release note

Documents the new TinyMCE AI chat option and adds the accompanying release
note entry for the 8.9.0 release.

Covers TINYDOC-3561 (option reference section) and TINYMCE-14703.

* TINYDOC-3570: The tinymceai_chat_fetch_sources option can now nominate default sources for chat conversations.

* Update modules/ROOT/partials/configuration/tinymceai_options.adoc

Co-authored-by: tiny-ben-tran <ben.tran@tiny.cloud>

* Update modules/ROOT/pages/8.9.0-release-notes.adoc

Co-authored-by: tiny-ben-tran <ben.tran@tiny.cloud>

* Update modules/ROOT/pages/8.9.0-release-notes.adoc

Co-authored-by: tiny-ben-tran <ben.tran@tiny.cloud>

* Update modules/ROOT/pages/8.9.0-release-notes.adoc

Co-authored-by: tiny-ben-tran <ben.tran@tiny.cloud>

* TINYDOC-3570: Align the option reference with the menu array structure.

* TINYDOC-3570: Fix template literal interpolation in the TinyMCE AI examples.

* TINYDOC-3570: Fix broken literal syntax issue causing rendering issues.

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Co-authored-by: tiny-ben-tran <ben.tran@tiny.cloud>

* Docs: TINYMCE-13659 - Improved error message shown when the chat prompt exceeds the maximum length (#4315)

* Docs: TINYMCE-13738 - Image with empty alt text would add role="presentation" instead of adding alt text when updated (#4313)

* TINYDOC-3570: Improved error messages shown when adding a file context source fails. (#4319)

* Docs: TINYMCE-14747 - New commands for running reviews (#4312)

* Docs: TINYMCE-14519 - Changes to text alongside a nested list or table did not render as diffs in Review mode (#4311)

* TINYDOC-3570: Tooltips could not be closed using `Esc` (#4310)

* Docs: TINYMCE-14506 - Tooltips could not be closed using `Esc`

* TINYDOC-3570: Remove the tooltip focus behavior sentence pending TINYMCE-14659.

* Docs: TINYMCE-14749 - Chat welcome actions moved focus into the editor and reset the content scroll position (#4309)

* TINYDOC-3570: New option `tinycomments_always_show_highlights` to keep comment highlights visible while the sidebar is closed. (#4308)

* Docs: TINYMCE-14726 - New option `tinycomments_always_show_highlights` to keep comment highlights visible while the sidebar is closed

* Docs: TINYMCE-14726 - Align user_id example value with the embedded mode setup example

* Docs: TINYMCE-14726 - Match the Comments option examples in the tinycomments_always_show_highlights example

* TINYDOC-3570: Improved error message shown when an invalid URL is added as a context source. (#4321)

* TINYDOC-3570: Improved error message shown when the document is too long for a quick action or review. (#4320)

* TINYDOC-3570: Improved error message shown when a chat message exceeds the AI context limit (#4314)

* Docs: TINYMCE-13661 - Improved error message shown when a chat message exceeds the AI context limit

* Update modules/ROOT/pages/8.9.0-release-notes.adoc

Co-authored-by: Hamza Benkhaldoun <hamza0867@gmail.com>

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Co-authored-by: Hamza Benkhaldoun <hamza0867@gmail.com>

* TINYDOC-3570: Resizable sidebars documentation (TINYMCE-14486) (#4307)

* Docs: TINYDOC-3570 - New options for configuring the width of resizable sidebars

* Docs: TINYMCE-14678 - Custom sidebars opt in to resizing with the new resizable property

Also covers TINYMCE-14527 (resize behaviour), TINYMCE-14683 (premium sidebars
resizable by default) and TINYMCE-14554 (persisting the sidebar width).

* Docs: TINYMCE-14529 - Add SidebarResizeStart and SidebarResized events

* Docs: TINYMCE-14527 - Sidebars can now be resized by dragging their edge

Adds release note entries for TINYMCE-14527, TINYMCE-14529, TINYMCE-14530,
TINYMCE-14678 and TINYMCE-14683 to the 8.9.0 release notes.

* Docs: TINYMCE-14678 - Use a version admonition for resizable sidebar availability

Adds the 8.9 requires-version admonition partial and links api.element() to
the sidebar API object reference.

* Docs: TINYMCE-14678 - Show the resizable property in the custom sidebar examples

* Docs: TINYMCE-14683 - Note the Comments sidebar width change and the floating AI sidebar exception

* TINYDOC-3570: Restored the icon-only buttons in the AI suggestion preview (TINYMCE-14814)

* TINYDOC-3570: General template cleanup before release.

* TINYDOC-3570: Add changelog for tinymce.

* TINYDOC-3570: Update release dates.

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Co-authored-by: tiny-ben-tran <ben.tran@tiny.cloud>
Co-authored-by: Hamza Benkhaldoun <hamza0867@gmail.com>

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Co-authored-by: tiny-ben-tran <ben.tran@tiny.cloud>
Co-authored-by: Hamza Benkhaldoun <hamza0867@gmail.com>