feat(player): set right ctrl vol max to mpv's vol max if player==local (#2198)

src/shared/constants/volume.ts

@@ -0,0 +1,10 @@
+// Defines the volume limits shared by the main and renderer processes.
+// The active maximum is resolved from these in the renderer, which owns the
+// playback settings that determine it.
+
+// The web-audio backend has no headroom above unity gain, so it stays at 100.
+export const DEFAULT_VOLUME_MAX = 100;
+// mpv's default --volume-max when the user passes nothing.
+export const MPV_VOLUME_MAX_DEFAULT = 130;
+// mpv's own hard ceiling for --volume-max.
+export const MPV_VOLUME_MAX_CEILING = 1000;