Add Windows native notifications for chat sessions

- Add tauri-plugin-notification for native Windows notifications
- Send notification when new chat session is started
- Configure notification permissions in capabilities

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/desktop/src-tauri/Cargo.lock

@@ -73,6 +73,7 @@ dependencies = [
  "sysinfo",
  "tauri",
  "tauri-build",
+ "tauri-plugin-notification",
  "tauri-plugin-opener",
  "tauri-plugin-process",
  "tauri-plugin-store",
@@ -2101,6 +2102,18 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c41e0c4fef86961ac6d6f8a82609f55f31b05e4fce149ac5710e439df7619ba4"
 
+[[package]]
+name = "mac-notification-sys"
+version = "0.6.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "65fd3f75411f4725061682ed91f131946e912859d0044d39c4ec0aac818d7621"
+dependencies = [
+ "cc",
+ "objc2 0.6.3",
+ "objc2-foundation 0.3.2",
+ "time",
+]
+
 [[package]]
 name = "markup5ever"
 version = "0.14.1"
@@ -2256,6 +2269,20 @@ version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "72ef4a56884ca558e5ddb05a1d1e7e1bfd9a68d9ed024c21704cc98872dae1bb"
 
+[[package]]
+name = "notify-rust"
+version = "4.11.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6442248665a5aa2514e794af3b39661a8e73033b1cc5e59899e1276117ee4400"
+dependencies = [
+ "futures-lite",
+ "log",
+ "mac-notification-sys",
+ "serde",
+ "tauri-winrt-notification",
+ "zbus",
+]
+
 [[package]]
 name = "ntapi"
 version = "0.4.1"
@@ -2872,7 +2899,7 @@ checksum = "740ebea15c5d1428f910cd1a5f52cebf8d25006245ed8ade92702f4943d91e07"
 dependencies = [
  "base64 0.22.1",
  "indexmap 2.11.4",
- "quick-xml",
+ "quick-xml 0.38.3",
  "serde",
  "time",
 ]
@@ -3002,6 +3029,15 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "quick-xml"
+version = "0.37.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "331e97a1af0bf59823e6eadffe373d7b27f485be8748f71471c662c1f269b7fb"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "quick-xml"
 version = "0.38.3"
@@ -4130,6 +4166,25 @@ dependencies = [
  "walkdir",
 ]
 
+[[package]]
+name = "tauri-plugin-notification"
+version = "2.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "01fc2c5ff41105bd1f7242d8201fdf3efd70749b82fa013a17f2126357d194cc"
+dependencies = [
+ "log",
+ "notify-rust",
+ "rand 0.9.2",
+ "serde",
+ "serde_json",
+ "serde_repr",
+ "tauri",
+ "tauri-plugin",
+ "thiserror 2.0.17",
+ "time",
+ "url",
+]
+
 [[package]]
 name = "tauri-plugin-opener"
 version = "2.5.0"
@@ -4310,6 +4365,18 @@ dependencies = [
  "toml 0.9.8",
 ]
 
+[[package]]
+name = "tauri-winrt-notification"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b1e66e07de489fe43a46678dd0b8df65e0c973909df1b60ba33874e297ba9b9"
+dependencies = [
+ "quick-xml 0.37.5",
+ "thiserror 2.0.17",
+ "windows 0.61.3",
+ "windows-version",
+]
+
 [[package]]
 name = "tempfile"
 version = "3.23.0"