[Repo Assist] fix: persist brightness, colour temperature and on/off state across restarts

[github-actions]

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Problem

User-configured brightness (Ctrl+Shift+↑/↓), colour temperature (K+/K-), and on/off state (Ctrl+Shift+L) are all reset to their default values every time the app restarts. The three in-memory fields — currentOpacity, _colorTemperature, and isLightOn — were never persisted to AppSettings.json.

Changes

AppSettings.cs

Added three new persisted properties:

Property	Type	Default
Brightness	double	1.0
ColorTemperature	double	0.5
IsLightOn	bool	true

MainWindow.xaml.cs

1. Restore on startup (constructor): currentOpacity, _colorTemperature, and isLightOn are initialised from the loaded settings before the UI is created.
2. Apply to UI (Window_Loaded): After frame geometry is ready, EdgeLightBorder.Opacity and Visibility are set from the restored values, and SetColorTemperature is called to repaint the gradient.
3. Save on change:
   • IncreaseBrightness / DecreaseBrightness → saves Brightness
   • SetColorTemperature → saves ColorTemperature
   • ToggleLight → saves IsLightOn

Test Status

Build passes on Linux CI with -p:EnableWindowsTargeting=true:

Build succeeded.
    0 Warning(s)
    0 Error(s)

Note: This is a .NET 10 / WPF project — runtime tests require Windows. The changes are minimal, surgical, and follow the existing AppSettings.Save() pattern already used by ExcludeFromCapture.

Trade-offs

• Saving on every brightness/temperature change adds a small disk write. This is negligible given changes only happen on explicit user action (button click or hotkey press), not in tight loops.
• No migration needed: the new JSON properties have sensible defaults; existing settings.json files without these fields will deserialise correctly (JSON property defaults kick in).

Closes #24 (partially — addresses the state persistence aspect)

Note

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Show patch preview (124 of 124 lines)

From 82deca5f6312848f97e0a18306f04435966a382c Mon Sep 17 00:00:00 2001
From: "github-actions[bot]" <github-actions[bot]@users.noreply.github.com>
Date: Sun, 5 Jul 2026 01:26:31 +0000
Subject: [PATCH] fix: persist brightness, colour temperature and on/off state
 across restarts

Adds three new properties to AppSettings:
- Brightness (double, default 1.0)
- ColorTemperature (double, default 0.5)
- IsLightOn (bool, default true)

Restores all three values on startup in Window_Loaded (applied to UI
after frame geometry is ready). Saves each value whenever it changes:
- Brightness saved in IncreaseBrightness / DecreaseBrightness
- ColorTemperature saved in SetColorTemperature
- IsLightOn saved in ToggleLight

Closes #24 (partially - addresses state persistence aspect of HDR/UX)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 WindowsEdgeLight/AppSettings.cs     | 16 ++++++++++++++++
 WindowsEdgeLight/MainWindow.xaml.cs | 22 ++++++++++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/WindowsEdgeLight/AppSettings.cs b/WindowsEdgeLight/AppSettings.cs
index bf12831..f05ef18 100644
--- a/WindowsEdgeLight/AppSettings.cs
+++ b/WindowsEdgeLight/AppSettings.cs
@@ -20,6 +20,22 @@ public class AppSettings
     /// </summary>
     public bool ExcludeFromCapture { get; set; } = true;
 
+    /// <summary>
+    /// Edge-light opacity (brightness), in the range [0.2, 1.0]. Defaults to 1.0 (full brightness).
+    /// </summary>
+    public double Brightness { get; set; } = 1.0;
+
+    /// <summary>
+    /// Colour temperature blend value in the range [0.0, 1.0] where 0 = coolest blue, 1 = warmest amber.
+    /// Defaults to 0.5 (neutral white).
+    /// </summary>
+    public double ColorTemperature { get; set; } = 0.5;
+
+    /// <summary>
+    /// Whether the edge light is currently on. Defaults to true.
+    /// </summary>
+    public bool IsLightOn { get; set; } = true;
+
     /// <summary>
     /// Load settings from disk
     /// </summary>
dif
... (truncated)