Fix review findings: toggle logic, preset saving, version lookup, async audio ops

- Fix inverted effects toggle in FloatingGenerateBox
- Add Save button + API method for editing custom effect presets
- Return early on effects save failure in ProfileForm
- Fix no-op ternary in effectsStore
- Handle duplicate preset names with proper 400 response
- Use effects_chain is None instead of label for clean version lookup
- Move blocking audio ops to asyncio.to_thread in async endpoints
- Log warnings instead of silently swallowing parse errors

app/src/stores/effectsStore.ts

@@ -22,5 +22,5 @@ export const useEffectsStore = create<EffectsStore>((set) => ({
   setWorkingChain: (chain) => set({ workingChain: chain }),
 
   isCreatingNew: false,
-  setIsCreatingNew: (v) => set({ isCreatingNew: v, selectedPresetId: v ? null : null }),
+  setIsCreatingNew: (v) => set({ isCreatingNew: v, ...(v && { selectedPresetId: null }) }),
 }));