feat: manual bitrate override slider for screen share settings

- Add customBitrateKbps to ScreenShareConfig (null = auto matrix lookup)
- Slider in Stream Settings popover: 500 kbps–20 Mbps, step 500 kbps
- "Reset to Auto" clears override back to preset-derived bitrate
- Live updates via existing applyOverdrive() pipeline on active streams
- Persist version 5 → 6 with migration

packages/web/src/components/voice/ScreenShareSettingsPopover.tsx

@@ -3,6 +3,10 @@ import { useVoiceStore } from '../../stores/voiceStore';
 import type { ScreenShareConfig } from '../../stores/voiceStore';
 import { buildScreenShareOptions } from '../../utils/screenShare';
 
+const BITRATE_MIN = 500;   // kbps
+const BITRATE_MAX = 20000; // kbps
+const BITRATE_STEP = 500;  // kbps
+
 interface ScreenShareSettingsPopoverProps {
   open: boolean;
   onClose: () => void;
@@ -38,6 +42,12 @@ function formatDegradation(pref: RTCDegradationPreference): string {
   }
 }
 
+function formatKbps(kbps: number): string {
+  return kbps >= 1000
+    ? `${(kbps / 1000).toFixed(kbps % 1000 === 0 ? 0 : 1)} Mbps`
+    : `${kbps} kbps`;
+}
+
 export function ScreenShareSettingsPopover({ open, onClose }: ScreenShareSettingsPopoverProps) {
   const popoverRef = useRef<HTMLDivElement>(null);
   const config = useVoiceStore((s) => s.screenShareConfig);
@@ -125,6 +135,46 @@ export function ScreenShareSettingsPopover({ open, onClose }: ScreenShareSetting
             ))}
           </div>
         </div>
+
+        {/* Bitrate Override */}
+        <div>
+          <div className="flex items-center justify-between mb-1.5">
+            <div className="text-[11px] text-discord-text-muted font-semibold uppercase tracking-wider">
+              Bitrate
+            </div>
+            {config.customBitrateKbps != null && (
+              <button
+                onClick={() => setConfig({ customBitrateKbps: null })}
+                className="text-[11px] text-discord-blurple hover:text-[#7983f5] font-medium transition-colors"
+              >
+                Reset to Auto
+              </button>
+            )}
+          </div>
+          <div className="flex items-center gap-2">
+            <input
+              type="range"
+              min={BITRATE_MIN}
+              max={BITRATE_MAX}
+              step={BITRATE_STEP}
+              value={config.customBitrateKbps ?? Math.round(result.publish.videoEncoding.maxBitrate / 1000)}
+              onChange={(e) => setConfig({ customBitrateKbps: Number(e.target.value) })}
+              className="flex-1 h-1.5 accent-discord-blurple cursor-pointer appearance-none bg-[#4e5058] rounded-full
+                [&::-webkit-slider-thumb]:appearance-none [&::-webkit-slider-thumb]:w-3.5 [&::-webkit-slider-thumb]:h-3.5
+                [&::-webkit-slider-thumb]:rounded-full [&::-webkit-slider-thumb]:bg-white [&::-webkit-slider-thumb]:shadow-md
+                [&::-webkit-slider-thumb]:cursor-pointer [&::-webkit-slider-thumb]:border-0
+                [&::-moz-range-thumb]:w-3.5 [&::-moz-range-thumb]:h-3.5 [&::-moz-range-thumb]:rounded-full
+                [&::-moz-range-thumb]:bg-white [&::-moz-range-thumb]:border-0 [&::-moz-range-thumb]:cursor-pointer"
+            />
+            <span className={`text-[12px] font-medium min-w-[64px] text-right ${
+              config.customBitrateKbps != null ? 'text-discord-text-primary' : 'text-discord-text-muted'
+            }`}>
+              {config.customBitrateKbps != null
+                ? formatKbps(config.customBitrateKbps)
+                : `Auto`}
+            </span>
+          </div>
+        </div>
       </div>
 
       {/* Footer — computed stats */}

packages/web/src/stores/voiceStore.ts

@@ -7,6 +7,7 @@ export interface ScreenShareConfig {
   height: 1080 | 720 | 540;
   fps: 60 | 45 | 30;
   mode: 'gaming' | 'text';
+  customBitrateKbps: number | null;
 }
 
 interface VoiceState {
@@ -109,7 +110,7 @@ export const useVoiceStore = create<VoiceState>()(
       inputDeviceId: 'default',
       outputDeviceId: 'default',
       focusedParticipantId: null,
-      screenShareConfig: { height: 720, fps: 60, mode: 'gaming' },
+      screenShareConfig: { height: 720, fps: 60, mode: 'gaming', customBitrateKbps: null },
       participantVolumes: new Map(),
       setParticipantVolume: (userId, volume) => {
         set((state) => {
@@ -323,7 +324,7 @@ export const useVoiceStore = create<VoiceState>()(
     }),
     {
       name: 'opencord-voice-settings',
-      version: 5,
+      version: 6,
       migrate: (persistedState: any, version: number) => {
         if (version === 0) {
           persistedState.streamAttenuationEnabled = false;
@@ -348,6 +349,11 @@ export const useVoiceStore = create<VoiceState>()(
           persistedState.screenShareConfig = { height, fps, mode: 'gaming' };
           delete persistedState.videoQuality;
         }
+        if (version < 6) {
+          if (persistedState.screenShareConfig) {
+            persistedState.screenShareConfig.customBitrateKbps = null;
+          }
+        }
         return persistedState;
       },
       storage: createJSONStorage(() => localStorage),

packages/web/src/utils/screenShare.ts

@@ -53,9 +53,11 @@ const BITRATE_MATRIX: Record<number, Record<number, number>> = {
 const WIDTH_MAP: Record<number, number> = { 1080: 1920, 720: 1280, 540: 960 };
 
 export function buildScreenShareOptions(config: ScreenShareConfig): ScreenShareBuildResult {
-  const { height, fps, mode } = config;
+  const { height, fps, mode, customBitrateKbps } = config;
   const width = WIDTH_MAP[height]!;
-  const maxBitrate = BITRATE_MATRIX[height]![fps]!;
+  const maxBitrate = customBitrateKbps != null
+    ? customBitrateKbps * 1000
+    : BITRATE_MATRIX[height]![fps]!;
   const minBitrate = Math.round(maxBitrate * 0.25);
 
   return {