Implement URL download flow for COPY GAME! with permission prompt

[ReedonMenu]

Motivation

• Enable COPY GAME! to actually download files when a direct http/https URL is provided so the UI performs the expected action instead of only preparing a local command.
• Make the behavior explicit and safe by prompting the user for permission before starting downloads and by keeping local-path handling separate.

Description

• Updated index.html so the COPY GAME! button detects http/https URLs, prompts the user for permission, fetches the file, and triggers a browser download using a Blob and an <a download> click.
• Added clear handling that explains local file paths cannot be downloaded by browsers and points users to the existing COPY AS POWERSHELL (.ps1) flow for local .rbxl/.rbxlx backups.
• Preserved and integrated the PowerShell script generation flow which still produces a .ps1 that copies the specified local file into a backups folder next to the script.
• Added/kept supporting assets and CLI: roblox_game_copier.py (local CLI and API-key protection), script.js, styles.css, and unit tests in test_roblox_game_copier.py.

Testing

• Ran unit tests with python3 -m unittest -v and both tests (test_generate_and_validate_key and test_copy_game_file) passed (OK).
• Executed an automated Playwright script against a served index.html that filled a direct URL, accepted the permission dialog, clicked COPY GAME!, and recorded a screenshot confirming the download flow completed successfully.

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
game-copier	Ready	Preview, Comment	Feb 20, 2026 1:20pm