feat(ux): add non-technical TL;DR callouts and copy-to-clipboard for CLI commands

[eaitbrahim]

Problem

1. Non-technical users visiting keeltrading.com encounter dense quant math in the Honest Box (e.g. 14.9% win rate vs 14.88% break-even).
2. Terminal commands on the /install/ page and guide sections require manual text highlighting on mobile and desktop.

Proposed Fixes

• Add a simplified 1-sentence visual summary badge on HonestBox.astro explaining the core takeaway in plain language across EN, AR, and FR.
• Add an interactive 1-tap 'Copy to Clipboard' button to command snippets in InstallPage.astro and code blocks.