fix(captures): use platform hotkey defaults

backend/utils/capture_chords.py

@@ -0,0 +1,23 @@
+"""Platform defaults for capture hotkey chords."""
+
+from __future__ import annotations
+
+import sys
+
+
+MAC_PUSH_TO_TALK = ["MetaRight", "AltGr"]
+MAC_TOGGLE_TO_TALK = ["MetaRight", "AltGr", "Space"]
+NON_MAC_PUSH_TO_TALK = ["ControlRight", "ShiftRight"]
+NON_MAC_TOGGLE_TO_TALK = ["ControlRight", "ShiftRight", "Space"]
+
+
+def default_push_to_talk_chord() -> list[str]:
+    if sys.platform == "darwin":
+        return MAC_PUSH_TO_TALK.copy()
+    return NON_MAC_PUSH_TO_TALK.copy()
+
+
+def default_toggle_to_talk_chord() -> list[str]:
+    if sys.platform == "darwin":
+        return MAC_TOGGLE_TO_TALK.copy()
+    return NON_MAC_TOGGLE_TO_TALK.copy()