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/Cargo.lock

@@ -3098,6 +3098,16 @@ version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64"
 
+[[package]]
+name = "signal-hook-registry"
+version = "1.4.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c4db69cba1110affc0e9f7bcd48bbf87b3f4fc7c61fc9155afd4c469eb3d6c1b"
+dependencies = [
+ "errno",
+ "libc",
+]
+
 [[package]]
 name = "simd-adler32"
 version = "0.3.9"
@@ -3742,6 +3752,7 @@ dependencies = [
  "libc",
  "mio",
  "pin-project-lite",
+ "signal-hook-registry",
  "socket2",
  "tokio-macros",
  "windows-sys 0.61.2",

src-tauri/Cargo.toml

@@ -26,7 +26,7 @@ base64 = "0.22"
 log = "0.4"
 png = "0.17"
 dirs = "5"
-tokio = { version = "1", features = ["time", "macros"] }
+tokio = { version = "1", features = ["time", "macros", "process"] }
 
 [target.'cfg(target_os = "macos")'.dependencies]
 core-graphics = "0.24"

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(())

src-tauri/tauri.conf.json

@@ -21,7 +21,7 @@
         "minWidth": 320,
         "minHeight": 300,
         "decorations": true,
-        "titleBarStyle": "overlay",
+        "titleBarStyle": "Overlay",
         "hiddenTitle": true,
         "visible": false,
         "alwaysOnTop": true,

src/components/SettingsPanel.tsx

@@ -1,4 +1,4 @@
-import { useCallback } from "react";
+import { useState, useCallback } from "react";
 import { invoke } from "@tauri-apps/api/core";
 import type { Settings } from "../types";
 
@@ -19,11 +19,17 @@ const POSITION_OPTIONS: { value: string; label: string }[] = [
   { value: "bottom-left", label: "Bottom left" },
 ];
 
-export default function SettingsPanel({ settings, onClose, onUpdate }: Props) {
+export default function SettingsPanel({ settings: initialSettings, onClose, onUpdate }: Props) {
+  const [settings, setSettings] = useState<Settings>(initialSettings);
+
   const updateSetting = useCallback(
     async (key: string, value: string) => {
+      // Optimistically update local state for instant visual feedback
+      setSettings((prev) => ({ ...prev, [key]: parseSettingValue(key, value) }));
+
       await invoke("set_setting", { key, value });
       const updated: Settings = await invoke("get_settings");
+      setSettings(updated);
       onUpdate(updated);
     },
     [onUpdate]
@@ -122,6 +128,13 @@ export default function SettingsPanel({ settings, onClose, onUpdate }: Props) {
   );
 }
 
+function parseSettingValue(key: string, value: string): unknown {
+  if (key === "launch_at_login" || key === "show_images") return value === "true";
+  if (key === "max_history" || key === "window_width" || key === "window_height")
+    return parseInt(value, 10);
+  return value;
+}
+
 function ToggleRow({
   label,
   checked,