ClearChat Home v1.4.3 - Public Widget Color Hard Refresh Fix

Patch-only update.

Fixes:
- Public chat button/header now re-fetch widget settings every time the chat button is opened.
- Public widget periodically refreshes settings while the page remains open.
- Adds nested clearchat/embed.js copy in case the website embed code points to /clearchat/clearchat/embed.js.
- Bumps version display to 1.4.3-home.

After applying:
1. Hard-refresh the admin settings page.
2. Save a widget color.
3. Hard-refresh the public page once.
4. Click the Chat button. The public button and widget header should match the saved color.
