Update dependencies and refactor encryption logic

Updates multiple dependencies to their latest versions in Cargo.lock and Cargo.toml.
Refactors encryption logic to use updated getrandom API.
Improves tray speed rate display by using ab_glyph for font rendering.

src-tauri/src/utils/dirs.rs

@@ -137,7 +137,7 @@ pub fn get_encryption_key() -> Result<Vec<u8>> {
     } else {
         // Generate and save new key
         let mut key = vec![0u8; 32];
-        getrandom::getrandom(&mut key)?;
+        getrandom::fill(&mut key)?;
 
         // Ensure directory exists
         if let Some(parent) = key_path.parent() {