- merge: merge origin/main, resolve conflicts and preserve both feature sets

- feat(tauri): register import/export and file dialogs; keep endpoint speed test and custom endpoints
- feat(api): add updateTrayMenu and onProviderSwitched; wire import/export APIs
- feat(types): extend global API declarations (import/export)
- chore(presets): GLM preset supports both new and legacy model keys
- chore(rust): add chrono dependency; refresh lockfile

src-tauri/Cargo.toml

@@ -21,6 +21,7 @@ tauri-build = { version = "2.4.0", features = [] }
 serde_json = "1.0"
 serde = { version = "1.0", features = ["derive"] }
 log = "0.4"
+chrono = "0.4"
 tauri = { version = "2.8.2", features = ["tray-icon"] }
 tauri-plugin-log = "2"
 tauri-plugin-opener = "2"