feat(playback): global speed with three strategies (#852)

* feat(playback): global speed with three strategies

Add Settings → Audio and player-bar controls for global playback speed
(speed with auto pitch correction as default, varispeed, manual pitch shift).
Time-stretch runs on a background worker; Orbit sessions force 1.0× passthrough.

* fix(playback): align seekbar, seek, and progress on content timeline

Unify UI timebase across varispeed and preserve strategies: full-track
duration, speed-scaled progress for DSP paths, and content-timeline seeks
without varispeed scaling. Reset the sample counter after seek so clicks
land correctly; restart playback on strategy/enable changes instead of
fragile hot-switching.

* fix(ui): anchor playback speed popover like volume controls

Replace the centered EQ-style modal with a player-bar popover (outside
click, Escape, reposition on scroll). Show compact controls in the bar
and overflow menu; keep strategy hints and labels in Settings only.

* docs(release): CHANGELOG and credits for playback speed (PR #852)

* docs(changelog): add playback speed entry for PR #852

* fix(clippy): simplify raw_counter_samples branch for CI

Collapse duplicate if branches flagged by clippy::if-same-then-else.

* fix(ui): wheel on pitch slider adjusts pitch in speed popover

In compact player-bar controls, scroll over the pitch row changes pitch;
elsewhere in the panel changes speed. Stop propagation so overflow menu
wheel does not tweak volume.

* fix(playback): address PR #852 review and drop ineffective dynamic imports

Translate playback-rate strings for de/fr/es/zh/nb/nl/ro; restamp sample
counter on live preserve-path speed changes; use neutral rate atomics for
radio progress; static-import playerStore in playListenSession (move preview
volume sync to previewPlayerVolumeSync side-effect module).

* fix(i18n): translate playback-rate strategy labels in all locales

Replace leftover English Varispeed/Pitch strings in ru and other non-en
settings blocks so popover strategy buttons and hints read natively.

* fix(i18n): refine German varispeed label to "Tonhöhe folgt dem Tempo"

---------

Co-authored-by: Psychotoxical <171614930+Psychotoxical@users.noreply.github.com>

src-tauri/crates/psysonic-audio/src/engine.rs

@@ -32,6 +32,7 @@ pub struct AudioEngine {
     pub eq_gains: Arc<[AtomicU32; 10]>,
     pub eq_enabled: Arc<AtomicBool>,
     pub eq_pre_gain: Arc<AtomicU32>,
+    pub playback_rate: crate::playback_rate::PlaybackRateAtomics,
     pub(crate) preloaded: Arc<Mutex<Option<PreloadedTrack>>>,
     /// Last fully downloaded manual-stream track bytes (same playback identity),
     /// used to recover seek/replay without waiting for network again.
@@ -366,6 +367,7 @@ pub fn create_engine() -> (AudioEngine, std::thread::JoinHandle<()>) {
         eq_gains: Arc::new(std::array::from_fn(|_| AtomicU32::new(0f32.to_bits()))),
         eq_enabled: Arc::new(AtomicBool::new(false)),
         eq_pre_gain: Arc::new(AtomicU32::new(0f32.to_bits())),
+        playback_rate: crate::playback_rate::PlaybackRateAtomics::new(),
         preloaded: Arc::new(Mutex::new(None)),
         stream_completed_cache: Arc::new(Mutex::new(None)),
         stream_completed_spill: Arc::new(Mutex::new(None)),