Chat improvements (#22823)

* 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

web/public/locales/en/views/chat.json

@@ -12,6 +12,23 @@
   "result": "Result",
   "arguments": "Arguments:",
   "response": "Response:",
+  "attachment_chip_label": "{{label}} on {{camera}}",
+  "attachment_chip_remove": "Remove attachment",
+  "open_in_explore": "Open in Explore",
+  "attach_event_aria": "Attach event {{eventId}}",
+  "attachment_picker_paste_label": "Or paste event ID",
+  "attachment_picker_attach": "Attach",
+  "attachment_picker_placeholder": "Attach an event",
+  "quick_reply_find_similar": "Find similar sightings",
+  "quick_reply_tell_me_more": "Tell me more about this",
+  "quick_reply_when_else": "When else was it seen?",
+  "quick_reply_find_similar_text": "Find similar sightings to this.",
+  "quick_reply_tell_me_more_text": "Tell me more about this one.",
+  "quick_reply_when_else_text": "When else was this seen?",
+  "anchor": "Reference",
+  "similarity_score": "Similarity",
+  "no_similar_objects_found": "No similar objects found.",
+  "semantic_search_required": "Semantic search must be enabled to find similar objects.",
   "send": "Send",
   "suggested_requests": "Try asking:",
   "starting_requests": {