Tab Suspender 1.0.19

Packaged Chrome extension release.

Install:

1. Download tab-suspender-1.0.19-extension.zip.
2. Unzip it locally.
3. Open chrome://extensions, enable Developer mode, then choose Load unpacked.
4. Select the unzipped extension folder.

Changes:

• Bumped extension version to 1.0.19.
• Replaced suspended-tab favicon with a transparent Zzz sleep mark.
• Simplified the popup to one main Suspend Other Tabs action.
• Removed Pro/free-tier gating from the local build.