refactor nodes into standalone file

backend/nodes/range_slider.py

@@ -0,0 +1,39 @@
+from __future__ import annotations
+import numpy as np
+from backend.node_registry import register_node
+
+
+@register_node(display_name="Float Slider")
+class RangeSlider:
+    """Interactive float control node with min/max bounds and a slider value."""
+
+    @classmethod
+    def INPUT_TYPES(cls):
+        return {
+            "required": {
+                "min_value": ("FLOAT", {"default": 0.0, "step": 0.01}),
+                "max_value": ("FLOAT", {"default": 1.0, "step": 0.01}),
+                "value": ("FLOAT", {
+                    "default": 0.5,
+                    "step": 0.01,
+                    "slider": True,
+                    "min_widget": "min_value",
+                    "max_widget": "max_value",
+                }),
+            }
+        }
+
+    RETURN_TYPES = ("FLOAT",)
+    RETURN_NAMES = ("value",)
+    FUNCTION = "process"
+
+    DESCRIPTION = (
+        "Interactive float slider. Set min and max bounds, then drag the slider to output a FLOAT value."
+    )
+
+    def process(self, min_value: float, max_value: float, value: float) -> tuple:
+        lo = min(float(min_value), float(max_value))
+        hi = max(float(min_value), float(max_value))
+        if hi == lo:
+            return (lo,)
+        return (float(np.clip(float(value), lo, hi)),)