fix(ai-chat) - fix AI record references when display names contain markdown characters (#23113)

<img width="516" height="86" alt="Screenshot 2026-07-21 at 16 41 16"
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## Summary
- Switch record references from `[[record:object:id:label]]` to
`[[record:object:id:label[[/record]]` so labels can include `]`,
backticks, brackets, and other markdown-significant characters
- Parse references with an explicit close tag (still accepting legacy
`]]`), escape labels before markdown lexing, and serialize mentions
through a shared formatter
- Update the AI chat system prompt so the model emits the new format

## Test plan
- [ ] Ask AI about a record whose name contains `` ` ``, `[`, `]`, or
`]]` and confirm it renders as a chip, not broken markdown
- [ ] Confirm legacy `[[record:...]]` references still chip correctly
- [ ] Mention a record in the chat editor and verify serialized text
uses `[[/record]]`
- [ ] Run:
- `npx jest src/modules/ai/utils/__tests__/findRecordReferences.test.ts
src/modules/ai/utils/__tests__/formatRecordReference.test.ts
src/modules/ai/utils/__tests__/protectRecordReferencesForMarkdown.test.ts
src/modules/ai/components/__tests__/TextWithRecordLinks.test.tsx
--config=packages/twenty-front/jest.config.mjs`
  - mention extension tests for `MentionTag` / `MentionSuggestion`

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packages/twenty-server/src/engine/metadata-modules/ai/ai-chat/constants/chat-system-prompts.const.ts

@@ -79,7 +79,8 @@ Format responses with markdown for clarity (headings, lists, code blocks, tables
 Record References - IMPORTANT:
 - Tool responses include a "recordReferences" array with clickable links
 - ONLY use record references that are returned by tools - NEVER make up IDs
-- Copy the exact format from the tool response: [[record:objectName:recordId:displayName]]
+- Copy the exact format from the tool response: [[record:objectName:recordId:displayName[[/record]]
+- Example: [[record:company:abc12345-1234-5678-abcd-123456789012:Acme Corp[[/record]]
 - Use record references only in paragraphs, lists, or markdown tables (\`| ... |\`); never in headings, code, links, or raw HTML
 - The recordId MUST be a real UUID (like "abc12345-1234-5678-abcd-123456789012")
 - DO NOT create record references before calling the tool