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/linux-portals/index.d.ts

@@ -0,0 +1,121 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+export interface ResolveWindowPidSpec {
+	backend: 'gnome-shell-eval';
+	token: string;
+}
+
+export declare function resolveWindowPid(spec: ResolveWindowPidSpec): Promise<number | null>;
+
+export declare function resolveKwinWindowPid(token: string): Promise<number | null>;
+
+export declare function resolveX11WindowPid(token: string): Promise<number | null>;
+
+export type FileChooserFilterKind = 0 | 1;
+
+export interface FileChooserFilterRule {
+	kind: FileChooserFilterKind;
+	pattern: string;
+}
+
+export interface FileChooserFilter {
+	name: string;
+	rules: ReadonlyArray<FileChooserFilterRule>;
+}
+
+export interface FileChooserOptions {
+	parentWindow?: string;
+	title?: string;
+	acceptLabel?: string;
+	modal?: boolean;
+	multiple?: boolean;
+	directory?: boolean;
+	currentFolder?: string;
+	currentName?: string;
+	currentFile?: string;
+	filters?: ReadonlyArray<FileChooserFilter>;
+	currentFilter?: FileChooserFilter;
+}
+
+export interface FileChooserResult {
+	cancelled: boolean;
+	uris: Array<string>;
+}
+
+export declare function openFile(options: FileChooserOptions): Promise<FileChooserResult>;
+
+export declare function saveFile(options: FileChooserOptions): Promise<FileChooserResult>;
+
+export interface BackgroundOptions {
+	reason?: string;
+	autostart?: boolean;
+	commandline?: ReadonlyArray<string>;
+	dbusActivatable?: boolean;
+}
+
+export interface BackgroundResult {
+	response: number;
+	cancelled: boolean;
+	background: boolean;
+	autostart: boolean;
+}
+
+export declare function requestBackground(options: BackgroundOptions): Promise<BackgroundResult>;
+
+export interface GlobalShortcutEntry {
+	id: string;
+	description: string;
+	preferredTrigger?: string;
+}
+
+export interface BoundGlobalShortcut {
+	id: string;
+	description?: string;
+	triggerDescription?: string;
+}
+
+export type GlobalShortcutPortalAction = 'listed' | 'bound' | 'cancelled';
+
+export interface GlobalShortcutsConfigureResult {
+	action: GlobalShortcutPortalAction;
+	shortcuts: Array<BoundGlobalShortcut>;
+}
+
+export type GlobalShortcutPortalEvent =
+	| {type: 'activated'; id: string}
+	| {type: 'deactivated'; id: string}
+	| {type: 'shortcuts-changed'; shortcuts: Array<BoundGlobalShortcut>}
+	| {type: 'closed'};
+
+export declare class GlobalShortcutsPortal {
+	constructor(onEvent: (event: GlobalShortcutPortalEvent) => void, appId?: string | null);
+
+	configure(entries: ReadonlyArray<GlobalShortcutEntry>): Promise<GlobalShortcutsConfigureResult>;
+
+	close(): void;
+}
+
+export declare function isAvailable(): boolean;
+
+export declare function getPortalVersion(): number | null;
+
+export declare function readColorScheme(): 'no-preference' | 'prefer-dark' | 'prefer-light';
+
+export declare function readContrast(): 'no-preference' | 'high';
+
+export declare function readAccentColor(): {r: number; g: number; b: number} | null;
+
+export interface SettingsChangeEvent {
+	namespace: string;
+	key: string;
+	uint32?: number;
+	accent?: {r: number; g: number; b: number};
+}
+
+export declare class Settings {
+	constructor(onChange: (event: SettingsChangeEvent) => void);
+
+	close(): void;
+}
+
+export declare const loadError: Error | null;