Fix Windows YouTube playback flow and overlay pointer tracking

src/core/services/youtube/playback-resolve.ts

@@ -0,0 +1,63 @@
+import { spawn } from 'node:child_process';
+
+const YOUTUBE_PLAYBACK_RESOLVE_TIMEOUT_MS = 15_000;
+const DEFAULT_PLAYBACK_FORMAT = 'b';
+
+function runCapture(
+  command: string,
+  args: string[],
+  timeoutMs = YOUTUBE_PLAYBACK_RESOLVE_TIMEOUT_MS,
+): Promise<{ stdout: string; stderr: string }> {
+  return new Promise((resolve, reject) => {
+    const proc = spawn(command, args, { stdio: ['ignore', 'pipe', 'pipe'] });
+    let stdout = '';
+    let stderr = '';
+    const timer = setTimeout(() => {
+      proc.kill();
+      reject(new Error(`yt-dlp timed out after ${timeoutMs}ms`));
+    }, timeoutMs);
+    proc.stdout.setEncoding('utf8');
+    proc.stderr.setEncoding('utf8');
+    proc.stdout.on('data', (chunk) => {
+      stdout += String(chunk);
+    });
+    proc.stderr.on('data', (chunk) => {
+      stderr += String(chunk);
+    });
+    proc.once('error', (error) => {
+      clearTimeout(timer);
+      reject(error);
+    });
+    proc.once('close', (code) => {
+      clearTimeout(timer);
+      if (code === 0) {
+        resolve({ stdout, stderr });
+        return;
+      }
+      reject(new Error(stderr.trim() || `yt-dlp exited with status ${code ?? 'unknown'}`));
+    });
+  });
+}
+
+export async function resolveYoutubePlaybackUrl(
+  targetUrl: string,
+  format = DEFAULT_PLAYBACK_FORMAT,
+): Promise<string> {
+  const ytDlpCommand = process.env.SUBMINER_YTDLP_BIN?.trim() || 'yt-dlp';
+  const { stdout } = await runCapture(ytDlpCommand, [
+    '--get-url',
+    '--no-warnings',
+    '-f',
+    format,
+    targetUrl,
+  ]);
+  const playbackUrl =
+    stdout
+      .split(/\r?\n/)
+      .map((line) => line.trim())
+      .find((line) => line.length > 0) ?? '';
+  if (!playbackUrl) {
+    throw new Error('yt-dlp returned empty output while resolving YouTube playback URL');
+  }
+  return playbackUrl;
+}