feat(transcription): v0.5.0 with global speaker management and trimming

- Backend: Added global speaker rename endpoint
- Backend: Hardened JSON parsing and timestamp offsets
- Frontend: Integrated Speaker Management Bar
- Frontend: Added Trim Start/End (Scissors) and Single Line Delete
- Frontend: Fixed various TypeScript and Syntax issues
- Docs: Full documentation of v0.5.0 features

transcription-tool/backend/app.py

@@ -97,6 +97,41 @@ async def upload_audio(
     
     return meeting
 
+from pydantic import BaseModel
+
+class RenameRequest(BaseModel):
+    old_name: str
+    new_name: str
+
+@app.post("/api/meetings/{meeting_id}/rename_speaker")
+def rename_speaker_globally(meeting_id: int, payload: RenameRequest, db: Session = Depends(get_db)):
+    meeting = db.query(Meeting).filter(Meeting.id == meeting_id).first()
+    if not meeting:
+        raise HTTPException(404, detail="Meeting not found")
+    
+    count = 0
+    # Iterate over all chunks directly from DB relation
+    for chunk in meeting.chunks:
+        if not chunk.json_content:
+            continue
+            
+        modified = False
+        new_content = []
+        for msg in chunk.json_content:
+            if msg.get("speaker") == payload.old_name:
+                msg["speaker"] = payload.new_name
+                modified = True
+                count += 1
+            new_content.append(msg)
+        
+        if modified:
+            # Force update of the JSON field
+            chunk.json_content = list(new_content)
+            db.add(chunk)
+            
+    db.commit()
+    return {"status": "updated", "rows_affected": count}
+
 @app.delete("/api/meetings/{meeting_id}")
 def delete_meeting(meeting_id: int, db: Session = Depends(get_db)):
     meeting = db.query(Meeting).filter(Meeting.id == meeting_id).first()