feat(desktop): port v0.11.4-v0.15.2 from Tauri to Electron + Discord-parity audio (v0.16.0)

Chronological port of every Tauri release commit (v0.11.4 -> v0.15.2)
into the Electron rebuild, plus Discord-style audio handling that goes
beyond the Tauri original.

Highlights:
  - All 17 Tauri release commits ported (audio fixes, custom notification
    sound, Discord-style chat UX, profile banner, changelog page,
    Discord-parity call UX, screen-share echo + re-watch UX, audio-loop
    fix).
  - Native napi-rs audio-loopback addon with WASAPI process-loopback:
      * EXCLUDE_TARGET_PROCESS_TREE for full-screen shares -> peers
        never hear themselves echoed back through the capture.
      * INCLUDE_TARGET_PROCESS_TREE for window shares -> only the
        picked window's audio is captured, not the whole OS mixer
        (Discord parity).
      * HWND -> PID resolution via Win32 GetWindowThreadProcessId.
  - Discord-style screen-source picker (thumbnail grid, screens vs
    apps tabs, live-refreshing thumbnails).
  - Hash routing fix for packaged builds (file:// can't resolve
    BrowserRouter paths).
  - Tauri sources removed (apps/desktop/src-tauri).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/desktop/src/components/PollComposerDialog.tsx

@@ -0,0 +1,120 @@
+import { useEffect, useState } from 'react';
+
+import { PollIcon, PlusIcon, SpinnerIcon, TrashIcon } from './icons';
+import { Modal } from './Modal';
+
+interface Props {
+  open: boolean;
+  sending: boolean;
+  error: string | null;
+  onClose: () => void;
+  onSubmit: (question: string, options: string[]) => Promise<void>;
+}
+
+export function PollComposerDialog({ open, sending, error, onClose, onSubmit }: Props) {
+  const [question, setQuestion] = useState('');
+  const [options, setOptions] = useState(['', '']);
+
+  useEffect(() => {
+    if (!open) return;
+    setQuestion('');
+    setOptions(['', '']);
+  }, [open]);
+
+  const filledOptions = options.map((option) => option.trim()).filter(Boolean);
+  const canSubmit = question.trim().length > 0 && filledOptions.length >= 2 && !sending;
+
+  return (
+    <Modal open={open} title="Umfrage erstellen" onClose={onClose} size="md">
+      <form
+        className="flex flex-col gap-4"
+        onSubmit={(e) => {
+          e.preventDefault();
+          if (!canSubmit) return;
+          void onSubmit(question, options);
+        }}
+      >
+        <label className="flex flex-col gap-1.5 text-sm">
+          <span className="font-semibold text-fg">Frage</span>
+          <input
+            autoFocus
+            value={question}
+            onChange={(e) => setQuestion(e.target.value)}
+            maxLength={140}
+            placeholder="Worüber sollen wir abstimmen?"
+            className="rounded-lg border border-line bg-surface-2 px-3 py-2 text-sm text-fg outline-none transition placeholder:text-fg-muted focus:border-accent/60 focus:ring-2 focus:ring-accent/20"
+          />
+        </label>
+
+        <div className="flex flex-col gap-2">
+          <div className="flex items-center justify-between">
+            <p className="text-sm font-semibold text-fg">Antworten</p>
+            <button
+              type="button"
+              onClick={() => setOptions((prev) => [...prev, ''])}
+              disabled={options.length >= 10}
+              className="inline-flex h-8 w-8 cursor-pointer items-center justify-center rounded-lg text-fg-muted transition hover:bg-surface-2 hover:text-fg focus:outline-none focus-visible:ring-2 focus-visible:ring-accent/40 disabled:cursor-not-allowed disabled:opacity-45"
+              aria-label="Antwort hinzufügen"
+              title="Antwort hinzufügen"
+            >
+              <PlusIcon className="h-4 w-4" />
+            </button>
+          </div>
+          {options.map((option, idx) => (
+            <div key={idx} className="flex items-center gap-2">
+              <span className="flex h-8 w-8 shrink-0 items-center justify-center rounded-lg bg-accent/10 text-xs font-semibold text-accent">
+                {idx + 1}
+              </span>
+              <input
+                value={option}
+                onChange={(e) => {
+                  const value = e.target.value;
+                  setOptions((prev) =>
+                    prev.map((item, itemIdx) => (itemIdx === idx ? value : item)),
+                  );
+                }}
+                maxLength={80}
+                placeholder={'Antwort ' + (idx + 1)}
+                className="min-w-0 flex-1 rounded-lg border border-line bg-surface-2 px-3 py-2 text-sm text-fg outline-none transition placeholder:text-fg-muted focus:border-accent/60 focus:ring-2 focus:ring-accent/20"
+              />
+              <button
+                type="button"
+                onClick={() => setOptions((prev) => prev.filter((_, itemIdx) => itemIdx !== idx))}
+                disabled={options.length <= 2}
+                aria-label="Antwort entfernen"
+                title="Antwort entfernen"
+                className="inline-flex h-9 w-9 cursor-pointer items-center justify-center rounded-lg text-fg-muted transition hover:bg-rose-500/15 hover:text-rose-500 focus:outline-none focus-visible:ring-2 focus-visible:ring-rose-500/30 disabled:cursor-not-allowed disabled:opacity-35"
+              >
+                <TrashIcon className="h-4 w-4" />
+              </button>
+            </div>
+          ))}
+        </div>
+
+        {error && (
+          <p className="rounded-lg border border-rose-500/30 bg-rose-500/10 px-3 py-2 text-xs text-rose-600 dark:text-rose-200">
+            {error}
+          </p>
+        )}
+
+        <div className="flex justify-end gap-2 pt-1">
+          <button
+            type="button"
+            onClick={onClose}
+            className="cursor-pointer rounded-lg border border-line bg-surface-2 px-3 py-2 text-sm text-fg transition hover:bg-surface-3"
+          >
+            Abbrechen
+          </button>
+          <button
+            type="submit"
+            disabled={!canSubmit}
+            className="inline-flex cursor-pointer items-center gap-2 rounded-lg bg-accent px-3 py-2 text-sm font-semibold text-accent-fg transition hover:brightness-110 focus:outline-none focus-visible:ring-2 focus-visible:ring-accent/50 disabled:cursor-not-allowed disabled:opacity-45"
+          >
+            {sending ? <SpinnerIcon className="h-4 w-4" /> : <PollIcon className="h-4 w-4" />}
+            <span>Senden</span>
+          </button>
+        </div>
+      </form>
+    </Modal>
+  );
+}