Hand-Icon als App-/Tray-Icon, App heißt ai-control, Tests für Keychain/Key-Status

- Icons komplett aus hand.png regeneriert (tauri icon)
- Tray-Icon explizit per include_bytes (cargo trackt die Datei) und als
  Template-Icon für helle/dunkle Menüleiste; tauri-Feature image-png
- Cargo-Paket app -> ai-control, Fenstertitel ai-control
- Tests: keychain_service-Suffix gegen verifizierten Referenzwert,
  hasCredentials-Status (Key vorhanden/leer/fehlt)

src-tauri/Cargo.lock

@@ -28,6 +28,28 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "ai-control"
+version = "0.1.0"
+dependencies = [
+ "base64 0.22.1",
+ "getrandom 0.2.17",
+ "log",
+ "objc2",
+ "objc2-app-kit",
+ "objc2-foundation",
+ "portable-pty",
+ "serde",
+ "serde_json",
+ "sha2",
+ "tauri",
+ "tauri-build",
+ "tauri-plugin-autostart",
+ "tauri-plugin-dialog",
+ "tauri-plugin-log",
+ "ureq",
+]
+
 [[package]]
 name = "alloc-no-stdlib"
 version = "2.0.4"
@@ -75,28 +97,6 @@ version = "1.0.103"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a4385e2e34eb35d6b3efe798b9eb88096925d87726c0798709bf56d9ed84af3"
 
-[[package]]
-name = "app"
-version = "0.1.0"
-dependencies = [
- "base64 0.22.1",
- "getrandom 0.2.17",
- "log",
- "objc2",
- "objc2-app-kit",
- "objc2-foundation",
- "portable-pty",
- "serde",
- "serde_json",
- "sha2",
- "tauri",
- "tauri-build",
- "tauri-plugin-autostart",
- "tauri-plugin-dialog",
- "tauri-plugin-log",
- "ureq",
-]
-
 [[package]]
 name = "arrayvec"
 version = "0.7.8"
@@ -327,6 +327,12 @@ version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
 
+[[package]]
+name = "byteorder-lite"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f1fe948ff07f4bd06c30984e69f5b4899c516a3ef74f34df92a2df2ab535495"
+
 [[package]]
 name = "bytes"
 version = "1.12.0"
@@ -1648,6 +1654,19 @@ dependencies = [
  "icu_properties",
 ]
 
+[[package]]
+name = "image"
+version = "0.25.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "85ab80394333c02fe689eaf900ab500fbd0c2213da414687ebf995a65d5a6104"
+dependencies = [
+ "bytemuck",
+ "byteorder-lite",
+ "moxcms",
+ "num-traits",
+ "png 0.18.1",
+]
+
 [[package]]
 name = "indexmap"
 version = "1.9.3"
@@ -1944,6 +1963,16 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "moxcms"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bb85c154ba489f01b25c0d36ae69a87e4a1c73a72631fc6c0eb6dde34a73e44b"
+dependencies = [
+ "num-traits",
+ "pxfm",
+]
+
 [[package]]
 name = "muda"
 version = "0.19.3"
@@ -2574,6 +2603,12 @@ dependencies = [
  "syn 1.0.109",
 ]
 
+[[package]]
+name = "pxfm"
+version = "0.1.29"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e0c5ccf5294c6ccd63a74f1565028353830a9c2f5eb0c682c355c471726a6e3f"
+
 [[package]]
 name = "quick-xml"
 version = "0.39.4"
@@ -3488,6 +3523,7 @@ dependencies = [
  "gtk",
  "heck 0.5.0",
  "http",
+ "image",
  "jni",
  "libc",
  "log",