fix voice memos and move metadata to properties

- Fix duplicate tab bug via onNoteCreatedRef (stale closure in recorder.onstop)
- Fix transcription not showing: read file from disk and update editor directly
- Move voice memo type/recorded/path from body to YAML frontmatter (Properties)
- Update note creation agent to detect voice memos via frontmatter

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/x/packages/core/src/knowledge/note_creation.ts

@@ -165,8 +165,8 @@ workspace-readFile({ path: "{source_file}" })
 - Email signature
 
 **Voice memo indicators:**
-- Has \`**Type:** voice memo\` field
-- Has \`**Path:**\` field with path like \`Voice Memos/YYYY-MM-DD/...\`
+- Has YAML frontmatter with \`type: voice memo\`
+- Has frontmatter \`path:\` field like \`Voice Memos/YYYY-MM-DD/...\`
 - Has \`## Transcript\` section
 
 **Set processing mode:**