Orbiscreen v0.27.1

Trackpad stability, latency cure for long sessions, persistent toolbar, and a real audio output device: RelativeMove now drives the true relative mouse on the host so the cursor stays put when you lift your finger (#77), accumulated session lag is hard-dropped the moment it exceeds 80 ms with EWMA clock smoothing preventing false positives (#77), the in-session toolbar no longer vanishes after 12 seconds, and "Orbiscreen Audio" now appears as a proper PipeWire/PulseAudio output device you can route any app to from system sound settings.

Bug Fixes

• Trackpad cursor jumps to primary screen on finger lift (#77): PointerEvent::RelativeMove in x11.rs was injected into the tablet uinput device as absolute Abs::X/Y with BTN_TOOL_PEN. When the finger lifted, the pen-proximity signal stopped and KWin snapped the cursor back to the primary screen. Fixed by routing RelativeMove to mouse_keyboard as true relative Rel::X/Rel::Y events. The cursor now stays exactly where it was on the secondary screen with no jump. References #77.
• Trackpad tap-to-click lands at wrong position: moveDelta() in InputDispatcher.kt accumulated pendingDx/pendingDy for the network loop but never updated cursorX/cursorY. When leftClick() fired it sent a Move to the stale center-of-screen position. Fixed by also updating cursorX/cursorY cumulatively in moveDelta() with boundary clamping. References #77.
• Latency accumulation after long sessions (#77): After 30-60 minutes ExoPlayer's internal buffer drifted ahead of real time. Added a coroutine in PlayerHolder.kt that checks bufferedPosition - currentPosition every 2 seconds and calls seekToDefaultPosition() + IDR request when lag exceeds 80 ms. Closes #77.
• Wi-Fi clock jitter causing false stale-frame drops: clockOffsetNs was updated raw on every PONG packet, so a single high-latency packet could spike the offset and trigger unnecessary IDR requests. Applied EWMA smoothing (alpha = 0.1) so the offset follows the trend, not individual outliers. Closes #77.
• Keyframe dropped during stale-frame flush (Wi-Fi): The stale-frame guard in UdpPlayer.kt discarded all frames including keyframes when measured latency exceeded 75 ms, causing a decoder freeze until the next IDR arrived. Fixed by exempting keyframes from the drop condition so the decoder can recover immediately. Closes #77.
• Session toolbar closes automatically: A LaunchedEffect(showControls) block was automatically hiding the controls after a 12-second delay. Removed the effect entirely; the toolbar now stays visible until the user explicitly taps the eye button. References #76.

Features & Improvements

• Virtual Audio Sink "Orbiscreen Audio": When a client connects with audio=1, the host now calls ensure_virtual_sink() which uses pactl load-module module-null-sink to create a dedicated sink named orbiscreen_audio with description "Orbiscreen Audio". The GStreamer pipeline captures from orbiscreen_audio.monitor instead of @DEFAULT_MONITOR@. The sink appears as a standard output device in GNOME/KDE sound settings and any application or system audio can be routed to it. The sink is idempotent -- it is only created if it does not already exist.

Changed

• Cargo Workspace: Bumped workspace package version to 0.27.1.
• Android Client: Incremented versionCode to 83; updated versionName to "0.27.1".
• Tauri GUI: Updated tauri.conf.json version to 0.27.1.
• PKGBUILD: Bumped pkgver to 0.27.1.
• debian/changelog: Added 0.27.1-1 release entry for Ubuntu noble.

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