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.

src-tauri/src/state.rs

@@ -0,0 +1,12 @@
+use tokio::sync::Mutex;
+
+#[derive(Default)]
+pub struct AppState {
+    pub client: Mutex<Option<soulseek_client::Client>>,
+    pub connected_as: Mutex<Option<String>>,
+    /// Server-distributed excluded search phrases (message 160). A query
+    /// containing one returns ZERO responses network-wide — the server simply
+    /// never routes it — so the resolver strips these terms up front instead
+    /// of discovering the silence by timeout. Lowercased on receipt.
+    pub excluded_search_phrases: Mutex<Vec<String>>,
+}