Add native self-hosted instance connection to fluxer_desktop

Trimmed monorepo checkout (fluxer_desktop + packages/voice_engine_v2 +
tools/ci) with a "Connect to a Different Server" menu item and popout
that lets the desktop app switch to any self-hosted Fluxer instance,
plus fixes for well-known discovery on single-domain self-hosted
deployments and a false-positive ERR_ABORTED on same-origin client
redirects during the switch. Defaults to chat.fluxr.chat and uses an
isolated userData directory from the official build.

fluxer_desktop/native/mac-screen-capture/index.d.ts

@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+import {EventEmitter} from 'node:events';
+
+export interface MacScreenCaptureBackendInfo {
+	backend: string;
+	supported: boolean;
+	reason: string;
+	minMacosVersion: string;
+	detectedMacosVersion?: string;
+	sckAvailable: boolean;
+}
+
+export declare function getBackendInfo(): MacScreenCaptureBackendInfo;
+
+export interface MacScreenCaptureBackendAvailability {
+	sck?: {
+		supported: boolean;
+		macosVersion?: string;
+	};
+	screenPermission?: string;
+}
+
+export declare function getBackendAvailability(): Promise<MacScreenCaptureBackendAvailability>;
+
+export type MacScreenCaptureSourceKind = 'screen' | 'window';
+
+export interface MacScreenCaptureSource {
+	kind: MacScreenCaptureSourceKind;
+	id: string;
+	name: string;
+	width: number;
+	height: number;
+	appName?: string;
+	bundleId?: string;
+	targetPid?: number;
+}
+
+export declare function listSources(): Promise<Array<MacScreenCaptureSource>>;
+
+export interface ScreenCaptureRect {
+	x: number;
+	y: number;
+	width: number;
+	height: number;
+}
+
+export interface ScreenCaptureOptions {
+	sourceId: string;
+	sourceKind: MacScreenCaptureSourceKind;
+	width?: number;
+	height?: number;
+	frameRate?: number;
+	captureId?: string;
+	colorRange?: 'full' | 'limited';
+	colorSpace?: 'rec709' | 'srgb';
+	showCursorClicks?: boolean;
+	captureRect?: ScreenCaptureRect;
+	frameSinkHandle?: unknown;
+	nativeFrameSinkRequired?: boolean;
+}
+
+export interface ScreenCaptureStartResult {
+	width: number;
+	height: number;
+	frameRate: number;
+	pixelFormat: 'nv12' | 'bgra';
+}
+
+export interface FrameSinkDiagnostics {
+	accepted: number;
+	coalesced: number;
+	rejected: number;
+	mediaFramesDroppedWithoutSink: number;
+}
+
+export declare const loadError: Error | null;
+
+export declare function __setBindingForTests(binding: unknown): void;
+
+export declare interface ScreenCapture {
+	on(event: 'error', listener: (err: Error) => void): this;
+	on(event: 'closed', listener: () => void): this;
+	on(event: 'diagnostic', listener: (message?: string) => void): this;
+	on(event: string | symbol, listener: (...args: Array<unknown>) => void): this;
+	off(event: 'error', listener: (err: Error) => void): this;
+	off(event: 'closed', listener: () => void): this;
+	off(event: 'diagnostic', listener: (message?: string) => void): this;
+	off(event: string | symbol, listener: (...args: Array<unknown>) => void): this;
+	emit(event: 'error', err: Error): boolean;
+	emit(event: 'closed'): boolean;
+	emit(event: 'diagnostic', message?: string): boolean;
+}
+
+export declare class ScreenCapture extends EventEmitter {
+	constructor(options: ScreenCaptureOptions);
+
+	start(): Promise<ScreenCaptureStartResult>;
+
+	stop(): Promise<void>;
+
+	attachEncoder(width: number, height: number, frameRate?: number): void;
+	detachEncoder(): void;
+	isEncoderAttached(): boolean;
+	encoderRingFullCount(): number;
+	getFrameSinkDiagnostics(): FrameSinkDiagnostics;
+}