Chat: Add New Updates

[DinkoK]

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[Copilot]

Pull request overview

This PR expands the WinForms RadChat documentation with new “Features” content (file upload, speech-to-text, replies, multi-line editor), updates existing reference docs (properties/methods/events, localization), and wires the new section into site navigation/redirects.

Changes:

• Added new Chat “Features” articles (Speech-to-Text, File Upload, Multi-Line Input Editor, Replies) and associated images.
• Moved/updated the Toolbar article into the new Features area and added a redirect for the old toolbar URL.
• Updated reference documentation for newly documented APIs/events and updated localization sample strings.

Reviewed changes

Copilot reviewed 10 out of 20 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
docs-builder.yml	Adds Chat “Features” section to nav + redirect for moved toolbar page
controls/chat/_meta.yml	Adds Chat section metadata
controls/chat/properties-methods-events.md	Documents new properties/methods/events (replies, attachments, speech-to-text, etc.)
controls/chat/localization/localization.md	Extends localization sample with new string IDs
controls/chat/customizing-appearance/accessing-and-customizing-elements.md	Updates element list and documents new accessible elements
controls/chat/features/toolbar.md	Reformats/moves toolbar doc under Features; adds front matter fields
controls/chat/features/speech-to-text.md	New feature article
controls/chat/features/replies.md	New feature article
controls/chat/features/multi-line-editor.md	New feature article
controls/chat/features/file-upload.md	New feature article
controls/chat/features/images/chat-items-toolbar002.gif	Adds toolbar image asset

Comments suppressed due to low confidence (2)

controls/chat/features/toolbar.md:10

• previous_url uses a relative path (controls/chat/toolbar) that doesn’t match the previous_url formats used elsewhere in this repo (typically legacy slug tokens and/or leading-slash paths, e.g. controls/calendar/features/header.md:9). If this is meant to redirect the old page location, consider switching to the established format (include a leading / for path-based URLs, or use the prior slug token), otherwise the redirect may not be picked up by the docs pipeline.
  controls/chat/features/toolbar.md:6
• This page lives under the new controls/chat/features/ section, but its slug remains winforms/chat/toolbar while the other pages in the same section use winforms/chat/features/... slugs (e.g. file-upload.md:5, speech-to-text.md:5). Keeping the old slug works only via redirects and creates an inconsistent URL scheme for the new Features section. Consider updating the slug to winforms/chat/features/toolbar and keeping the old slug/URL reachable via redirects.

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