fix: clamp startup window size to the current screen

[DanielLavrushin]

The window was created at a fixed 1024x768 logical pixels. On Windows those are scaled by the monitor DPI, so at 150% scaling the window was created at 1536x1152 physical pixels — taller than a 1080p work area — and Wails centers it, leaving it clipped at both the top and the bottom. 768 is also taller than the work area of a 1366x768 display at 100%.

Clamp the startup size to a fraction of the current screen and re-center, and set a minimum window size.

Fixes #5

[DanielLavrushin]

#5

[Copilot]

Pull request overview

This PR adjusts the Wails application’s startup window sizing logic so the initial window fits within the current screen (including common Windows DPI-scaling scenarios) and avoids being clipped off-screen on launch.

Changes:

• Replaces the hard-coded 1024×768 startup size with shared defaultWidth/defaultHeight constants and adds a minimum window size.
• Adds startup-time logic (fitWindowToScreen) to clamp the initial window size to a fraction of the current screen and re-center the window.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/main.go	Uses shared default dimensions and sets MinWidth/MinHeight in Wails app options.
src/app.go	Introduces default sizing constants and adds startup logic to clamp window size to the current screen and re-center.

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