Fix paste-to-app, settings highlight, and titleBarStyle casing

Paste fix:
- Switch from std::process::Command to tokio::process::Command to avoid
  blocking the async runtime (was stalling the paste action)
- Use explicit AppleScript that activates the frontmost app before sending
  Cmd+V keystroke, making paste more reliable
- Increase delay to 300ms for macOS app refocus
- Add tokio "process" feature

Settings highlight fix:
- SettingsPanel now uses local useState for immediate optimistic updates
  when clicking position/history buttons, instead of waiting for the
  parent prop round-trip
- Buttons highlight instantly on click, then sync with backend

Config fix:
- titleBarStyle must be PascalCase "Overlay" in Tauri 2 config (was
  lowercase "overlay" which caused a startup error)

Co-authored-by: Cursor <cursoragent@cursor.com>

src-tauri/src/commands.rs

@@ -74,16 +74,33 @@ pub async fn paste_and_refocus(app: tauri::AppHandle) -> Result<(), String> {
     }
 
     // macOS needs time to refocus the previous application
-    tokio::time::sleep(std::time::Duration::from_millis(250)).await;
+    tokio::time::sleep(std::time::Duration::from_millis(300)).await;
 
     #[cfg(target_os = "macos")]
     {
-        // .output() blocks until osascript finishes, ensuring the keystroke lands
-        std::process::Command::new("osascript")
+        // Activate the frontmost app explicitly, then send Cmd+V.
+        // Using tokio::process::Command to avoid blocking the async runtime.
+        let script = r#"
+tell application "System Events"
+    set frontApp to name of first application process whose frontmost is true
+end tell
+tell application frontApp to activate
+delay 0.1
+tell application "System Events"
+    keystroke "v" using command down
+end tell
+"#;
+        let output = tokio::process::Command::new("osascript")
             .arg("-e")
-            .arg(r#"tell application "System Events" to keystroke "v" using command down"#)
+            .arg(script)
             .output()
-            .map_err(|e| format!("osascript failed: {}", e))?;
+            .await
+            .map_err(|e| format!("osascript spawn failed: {}", e))?;
+
+        if !output.status.success() {
+            let stderr = String::from_utf8_lossy(&output.stderr);
+            log::warn!("osascript paste failed: {}", stderr);
+        }
     }
 
     Ok(())