Enhancement: Welcome popup for New Users [Issue: 344]

[saumya-pailwan]

Summary
This update adds Welcome Popup when launching HARP, improving usability and onboarding for new users. The popup now includes:

• A brief overview of HARP’s purpose and workflow.
• A explanation of the model selection layout (top, middle, bottom sections).
• Information on Hugging Face and Stability AI tokens.
• A “View Documentation” hyperlink for further guidance.
• “Don’t show again” functionality to skip the popup in future launches

Changes:

• Updated WelcomeWindow.h with a HARP overview, token instructions, documentation link and checkbox to skip popup.
• Updated main.cpp to adjust dialog dimensions and ensure the Welcome Popup loads correctly with updated settings

Local testing: Verified the following:

• Popup appears on first launch and hides when “Don’t show again” is selected.
• “Open Settings” correctly navigates to the settings dialog.
• “View Documentation” opens the HARP docs in the default browser.

Closes #344

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