chore: Update tauri-plugin-dialog to 2.6.0

Fixes version mismatch warning between Rust crate (2.5.0) and
NPM package (@tauri-apps/plugin-dialog 2.6.0)

src-tauri/Cargo.toml

@@ -96,16 +96,16 @@ futures-util = "0.3"
 # Platform-specific dependencies
 [target.'cfg(target_os = "linux")'.dependencies]
 # Note: xdg-portal feature disabled due to ashpd/zbus version incompatibility
-tauri-plugin-dialog = { version = "2.5.0" }
+tauri-plugin-dialog = { version = "2.6.0" }
 
 # Direct ALSA access for bit-perfect playback (bypasses CPAL limitations)
 alsa = "0.9"
 
 [target.'cfg(target_os = "macos")'.dependencies]
-tauri-plugin-dialog = { version = "2.5.0" }
+tauri-plugin-dialog = { version = "2.6.0" }
 
 [target.'cfg(target_os = "windows")'.dependencies]
-tauri-plugin-dialog = { version = "2.5.0" }
+tauri-plugin-dialog = { version = "2.6.0" }
 
 [patch.crates-io]
 cpal = { path = "vendor/cpal" }