fix(cli): preserve notes during sync moves

- Leave sync and watch notes empty by default instead of writing placeholder text.
- Preserve existing remote notes when moving or adopting files without --note.
- Detect tracked local moves by SHA-256 and update remote metadata safely.
- Skip files that vanish during watch scans instead of aborting the sync cycle.
- Bump NanoShare to 1.24.0 and the standalone CLI to 0.3.0.

my_modules/db/ConvexDB.py

@@ -52,14 +52,17 @@ class ConvexDB(ConvexDbBase):
     )
     return data
 
-  async def update_file(self, file_id:str, file_name:str, note:str, expires_at:datetime|None, user_id:str, file_path:str=''):
+  async def update_file(self, file_id:str, file_name:str, note:str|None, expires_at:datetime|None, user_id:str, file_path:str='', preserve_missing:bool=False):
     args = {
       'file_id': file_id,
       'file_name': file_name,
       'file_path': file_path,
-      'note': note,
       'user_id': user_id
     }
+    if note is not None:
+      args['note'] = note
+    elif not preserve_missing:
+      args['note'] = ''
     if expires_at:
       args['expires_at'] = expires_at.isoformat()