* Add score fusion helpers for find_similar_objects chat tool
* Add candidate query builder for find_similar_objects chat tool
* register find_similar_objects chat tool definition
* implement _execute_find_similar_objects chat tool dispatcher
* Dispatch find_similar_objects in chat tool executor
* Teach chat system prompt when to use find_similar_objects
* Add i18n strings for find_similar_objects chat tool
* Add frontend extractor for find_similar_objects tool response
* Render anchor badge and similarity scores in chat results
* formatting
* filter similarity results in python, not sqlite-vec
* extract pure chat helpers to chat_util module
* Teach chat system prompt about attached_event marker
* Add parseAttachedEvent and prependAttachment helpers
* Add i18n strings for chat event attachments
* Add ChatAttachmentChip component
* Make chat thumbnails attach to composer on click
* Render attachment chip in user chat bubbles
* Add ChatQuickReplies pill row component
* Add ChatPaperclipButton with event picker popover
* Wire event attachments into chat composer and messages
* add ability to stop streaming
* tweak cursor to appear at the end of the same line of the streaming response
* use abort signal
* add tooltip
* display label and camera on attachment chip
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