Baseline: full tree snapshot after git repository loss

The previous .git directory was found gutted (only info/ remained), so
history is unrecoverable locally. This commit restores version control
with the tree exactly as it stands: the working app, the preview-tracks
launcher on the artist hero, the scrollable-track-previews design bundle
(docs + approved mockups), and the Phase 0 validation artifacts.

crates/player/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "player"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+
+[dependencies]
+rodio = { version = "0.21", features = ["symphonia-all"] }
+symphonia = { version = "0.5", features = ["all"] }
+thiserror.workspace = true
+log.workspace = true
+
+[dev-dependencies]
+env_logger = "0.11"