fix(audio): restore bit-perfect USB exclusive playback and prevent crash on read-only buffers

[ajisth69]

Overview

Resolves Bit-Perfect audio regressions, crossfade audio focus pause locks, redesigns the Output Detector dialog into a Poweramp-style 5-stage pipeline flow, and adds YouTube Music Cookie Login (matching the desktop app).

Summary of Changes

1. YouTube Music Cookie Login (Matching Desktop):

   • Added \CookieNormalizer.kt\ (direct port of Desktop \InnerTubeMusicApi.normalizeCookies): supports raw \Cookie\ headers, Netscape \cookies.txt\ format (tab-separated, #HttpOnly\ flags), JSON exports from browser extensions (Cookie-Editor, EditThisCookie), and multiline text.
   • Enforces presence of the \SAPISID\ family (__Secure-3PAPISID, \SAPISID, or \APISID) required for InnerTube authenticated authorization tokens.
   • Added \CookieLoginDialog.kt\ with clipboard paste helper, real-time validation error alerts, and seamless connection.
   • Integrated Cookie Login into both \YouTubeLoginScreen.kt\ (header key button and bottom action bar) and \SettingsScreen.kt\ (direct action card under YouTube Music).
   • Wrote \CookieNormalizerTest.kt\ verifying raw headers, Netscape formats, JSON exports, and validation failures.

2. Fix Crossfade Audio Focus Pause Loop:

   • In \handOffCrossfade(), standby was previously called with \standby.setAudioAttributes(standby.audioAttributes, true), activating ExoPlayer's internal \AudioFocusManager.
   • This caused ExoPlayer to fight LastWave's manual
     equestMediaAudioFocus(), triggering an immediate \AUDIOFOCUS_LOSS (-1)\ / \PausePermanently\ callback 40ms into crossfading. Forced resumes repeatedly paused within milliseconds.
   • Fixed by keeping \handleAudioFocus = false\ on the standby player so crossfade volume mixing and app-level audio focus proceed seamlessly without platform focus collision.

3. Poweramp Bit-Perfect Definition Alignment:

   • Updated \SignalPath.kt\ so digital volume scaling / software gain override does not disqualify bit-perfect mode when source format, sample rate, and bit depth match the DAC wire format (matching Poweramp's behavior).
   • Exposed \�ctiveWireBits()\ on \ExclusiveUsbOutput\ to accurately compare source depth against the hardware wire transport slot.

4. Poweramp-Style Signal Path / Output Detector Redesign:

   • Reorganized the Output Detector dialog into Poweramp's 5-stage top-to-bottom pipeline flow: Source $\to$ DSP $\to$ Volume Control $\to$ Output $\to$ Output Device.
   • Added directional track flow lines (\↓), clickable underline titles, rotary knob dial icon for volume control, and technical device flags (\DIRECT, \OFFLOAD, \EXCL, \USB_AUDIO, etc.).
   • Integrated Poweramp's bottom dual status cards: Fidelity (100% / bit-perfect indicators) and DSP indicator.

5. Hardware & Direct USB DAC Stability:

   • Reverted \orceSoftwareVolume\ default to \alse\ to preserve UAC hardware volume controls on external DACs.
   • Prevented \ReadOnlyBufferException\ crashes on read-only MediaCodec direct byte buffers.
   • Safe software PCM scaling on isolated chunks and zero-volume latch reset on track transitions.