Fix create_prompt is_public bug, conditional version bump, and add Jotai prompts atoms

- Pass is_public from request body in create_prompt route
- Only bump version on content field changes (name, prompt, mode),
  not on is_public toggle
- Add prompts query and mutation atoms (atomWithQuery/atomWithMutation)
  with TanStack Query caching, replacing manual useEffect fetches
- Update PromptPicker, PromptsContent, and CommunityPromptsContent
  to consume shared atoms instead of local state

surfsense_backend/app/routes/prompts_routes.py

@@ -41,6 +41,7 @@ async def create_prompt(
         name=body.name,
         prompt=body.prompt,
         mode=body.mode,
+        is_public=body.is_public,
     )
     session.add(prompt)
     await session.commit()
@@ -65,10 +66,15 @@ async def update_prompt(
     if not prompt:
         raise HTTPException(status_code=404, detail="Prompt not found")
 
-    for field, value in body.model_dump(exclude_unset=True).items():
+    updates = body.model_dump(exclude_unset=True)
+    content_fields = {"name", "prompt", "mode"}
+    has_content_change = bool(updates.keys() & content_fields)
+
+    for field, value in updates.items():
         setattr(prompt, field, value)
 
-    prompt.version = (prompt.version or 0) + 1
+    if has_content_change:
+        prompt.version = (prompt.version or 0) + 1
 
     session.add(prompt)
     await session.commit()