fix(scenes): coerce BindableFloat fps to int when snapshotting

OutputTarget.fps is a BindableFloat but TargetSnapshot.fps is a plain
int — capture_current_snapshot was stuffing the BindableFloat directly
into the snapshot, causing json.dumps to fail on recapture (500) and
polluting the in-memory cache so subsequent list calls also 500'd with
pydantic validation errors.

server/src/ledgrab/core/scenes/scene_activator.py

@@ -6,6 +6,7 @@ These functions are used by both the scene-presets API route and the automation
 from typing import List, Optional, Set, Tuple
 
 from ledgrab.core.processing.processor_manager import ProcessorManager
+from ledgrab.storage.bindable import bfloat
 from ledgrab.storage.output_target_store import OutputTargetStore
 from ledgrab.storage.scene_preset import (
     ScenePreset,
@@ -38,7 +39,7 @@ def capture_current_snapshot(
                 running=running,
                 color_strip_source_id=getattr(t, "color_strip_source_id", ""),
                 brightness_value_source_id=getattr(t, "brightness_value_source_id", ""),
-                fps=getattr(t, "fps", 30),
+                fps=int(bfloat(getattr(t, "fps", 30), default=30.0)),
             )
         )
 
@@ -82,7 +83,7 @@ async def apply_scene_state(
                 changed["color_strip_source_id"] = ts.color_strip_source_id
             if getattr(target, "brightness_value_source_id", None) != ts.brightness_value_source_id:
                 changed["brightness_value_source_id"] = ts.brightness_value_source_id
-            if getattr(target, "fps", None) != ts.fps:
+            if int(bfloat(getattr(target, "fps", 30), default=30.0)) != ts.fps:
                 changed["fps"] = ts.fps
             if changed:
                 target.update_fields(**changed)