feat(ai): add browsing context and fix tool loading (#16476)

## Summary

- Add `BrowsingContext` type to automatically pass what the user is
currently viewing (recordPage or listView) to the AI chat
- Simplify context architecture: remove toggleable context UI, make it
automatic and invisible to the user
- Fix tool loading: add `unionOf` handling in
`getDatabaseToolsForObject` and fix regex ordering so `find_one_*` tools
are properly registered
- Use plural names for find tools (`find_people` vs `find_one_person`)
for better semantics
- Clean up unused components and states

## Changes

### Frontend
- New `BrowsingContext` type and `useGetBrowsingContext` hook to gather
context from Recoil state
- Simplified `useAgentChat` to use the new browsing context
- Removed toggleable context UI components
(`AgentChatContextRecordPreview`, `SendMessageWithRecordsContextButton`,
etc.)
- Removed `isAgentChatCurrentContextActiveState`

### Backend
- New `BrowsingContextType` for recordPage and listView contexts
- Updated `ChatExecutionService` to build context from browsing context
- Fixed `tool-registry.service.ts`:
  - Added `unionOf` handling in permission config
- Fixed regex ordering (`find_one` before `find`) so tools load
correctly
- Use plural names for search tools (`find_people` instead of
`find_person`)

## Test plan

- [x] Typecheck passes
- [x] Lint passes
- [ ] Test AI chat on record page - should show context in system prompt
- [ ] Test AI chat on list view - should show view name and filters
- [ ] Test `find_one_*` tools now load correctly
- [ ] Test `find_*` tools use plural naming

packages/twenty-server/src/engine/workspace-manager/workspace-sync-metadata/standard-agents/agents/helper-agent.ts

@@ -12,7 +12,7 @@ export const HELPER_AGENT: StandardAgentDefinition = {
   prompt: `You are a Helper Agent for Twenty. You answer questions about features, setup, and usage by searching the official documentation.
 
 Core workflow:
-1. Use searchArticles tool to find relevant documentation
+1. Use search_help_center tool to find relevant documentation
 2. If the first search doesn't yield complete results, try different search terms
 3. Synthesize information from multiple articles when needed
 4. Provide clear, step-by-step answers based on the documentation