fix: _btn pop font/width/height so CTkButton never gets duplicate kwargs

Made-with: Cursor

proxy_chain_manager/app.py

@@ -111,25 +111,26 @@ def main() -> None:
     # HELPERS
     # ─────────────────────────────────────────────────────────────────────────
     def _btn(parent: Any, label: str, cmd: Any, w: int = 80, h: int = 28, **kw: Any) -> ctk.CTkButton:
-        # Merge styling; pass font / corner_radius explicitly so nothing duplicates
-        # inside CTkButton (font must not appear in **kwargs passed to the base class).
-        merged: dict[str, Any] = {
-            "fg_color": ACCENT,
-            "hover_color": ACCENT2,
-            "text_color": TEXT,
-            **kw,
-        }
-        font = merged.pop("font", (FONT, 11))
-        corner_radius = merged.pop("corner_radius", 6)
+        # Pop styling keys so they are never duplicated in **kw (CustomTkinter raises on duplicate font, etc.).
+        font = kw.pop("font", (FONT, 11))
+        fg_color = kw.pop("fg_color", ACCENT)
+        hover_color = kw.pop("hover_color", ACCENT2)
+        text_color = kw.pop("text_color", TEXT)
+        corner_radius = kw.pop("corner_radius", 6)
+        width = kw.pop("width", w)
+        height = kw.pop("height", h)
         return ctk.CTkButton(
             parent,
             text=label,
             command=cmd,
-            width=w,
-            height=h,
-            corner_radius=corner_radius,
+            width=width,
+            height=height,
             font=font,
-            **merged,
+            fg_color=fg_color,
+            hover_color=hover_color,
+            text_color=text_color,
+            corner_radius=corner_radius,
+            **kw,
         )
 
     # ─────────────────────────────────────────────────────────────────────────