The dev branch had diverged significantly from master (which moved to .NET 9 + CsWin32), causing unresolvable merge conflicts in PR #117.

Changes

Framework & API migration (master baseline)

• Target framework: net6.0-windows → net9.0-windows7.0
• Replaced PInvoke.User32/PInvoke.Kernel32 with Microsoft.Windows.CsWin32 source generator
• Updated Helpers.cs, Program.cs, MainForm.cs, MainForm.Designer.cs to use Windows.Win32.PInvoke API and modern C# (file-scoped namespaces, collection expressions)
• Added missing NativeMethods.txt and App.config required by master

Random timer feature (dev-unique, preserved)

• --random/-r CLI option wired through Program.cs → MainForm constructor
• cbRandom checkbox + lbRandom display integrated into master's settings panel layout
• RandomTimer user setting persisted via Settings.Default
• Random interval uses Random.Shared and clamps to [1, JigglePeriod] seconds

if (RandomTimer)
{
    var newInterval = Random.Shared.Next(1, JigglePeriod + 1) * 1000;
    lbRandom.Text = $@"{newInterval / 1000} s";
    jiggleTimer.Interval = newInterval;
}

Other alignment with master

• JigglePeriod default: 1 → 60s; tbPeriod.Maximum: 60 → 10800
• Tray menu switched to master's inline-item approach (replaces named ToolStripMenuItem fields)
• FolderProfile.pubxml updated to net9.0-windows7.0
• README: preserved hardware jiggler section, updated CLI options docs to include -r/--random

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