Optimize performance and reduce binary size

- Remove tokio async runtime dependency (~2MB reduction)
- Optimize fuzzy search to avoid string allocations
- Optimize incremental search to only rebuild tree when needed
- Extract duplicate scrolling logic to helper function
- Replace magic numbers with named constants
- Fix terminal cleanup to run even on error
- Fix context menu item count mismatch
- Remove unused metadata fields (duration, codec, hash)

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cm-player"
-version = "0.1.22"
+version = "0.1.23"
 edition = "2021"
 
 [dependencies]
@@ -8,9 +8,6 @@ edition = "2021"
 ratatui = "0.28"
 crossterm = "0.28"
 
-# Async runtime
-tokio = { version = "1.40", features = ["full"] }
-
 # Serialization
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"