Fix timer persistence and desktop reliability

.gitignore

@@ -14,6 +14,7 @@ dist-ssr
 .npm-cache/
 .npm-logs/
 native-macos/.build/
+native-macos/build/
 src-tauri/standforge.db*
 
 # Editor directories and files

README.md

@@ -8,15 +8,15 @@ StandForge is a small macOS/Tauri app that runs a background sitting timer and p
 - Background timer that keeps running after the settings window is closed
 - Always-on-top reminder popup when it is time to stand
 - Pause, resume, stop, snooze, and manual phase switching
-- Local SQLite storage for cycle settings and completed stand sessions
+- Local persistence for cycle settings, active timers, and completed stand sessions
 - Today view with completed sessions, standing time, snooze count, and completion rate
 
 ## Development
 
 This repository now has two app implementations:
 
-- **Tauri/React**: the current cross-platform shell with CSS glass styling.
-- **Native macOS**: a SwiftUI/AppKit floating window that uses system Liquid Glass on macOS 26+.
+- **Tauri/React**: the current cross-platform shell with CSS glass styling and SQLite storage.
+- **Native macOS**: a SwiftUI/AppKit floating window that uses system Liquid Glass on macOS 26+ and stores its state in `UserDefaults`.
 
 ```bash
 npm install
@@ -50,3 +50,10 @@ npm run mac:native:build
 ```
 
 The native app bundle is written to `native-macos/.build/app/StandForge Native.app`.
+
+Run the backend and native unit tests with:
+
+```bash
+cargo test --locked --manifest-path src-tauri/Cargo.toml
+swift test --package-path native-macos
+```

native-macos/Package.swift

@@ -14,6 +14,10 @@ let package = Package(
         .executableTarget(
             name: "StandForgeMac",
             path: "Sources/StandForgeMac"
+        ),
+        .testTarget(
+            name: "StandForgeMacTests",
+            dependencies: ["StandForgeMac"]
         )
     ]
 )

native-macos/README.md

@@ -24,6 +24,15 @@ The app bundle is written to:
 native-macos/.build/app/StandForge Native.app
 ```
 
+Local builds use an ad-hoc signature. For a distributable Developer ID build,
+provide a signing identity and an optional notarytool keychain profile:
+
+```bash
+CODESIGN_IDENTITY="Developer ID Application: Example Corp (TEAMID)" \
+NOTARY_PROFILE="standforge-notary" \
+native-macos/scripts/build-app.sh
+```
+
 ## Liquid Glass behavior
 
 The SwiftUI version uses `GlassEffectContainer`, `glassEffect(_:in:)`, and the