v1.4.0 - Reuse existing GUI tabs

Added

• Reuse an existing same-origin DeepSeek Harness GUI tab when a Windows toast notification is clicked.
• Select the most recently focused connected GUI tab, open the target session there, and close the temporary toast-launched tab when the browser allows it.

Fallbacks

• If there is no live same-origin GUI tab, the newly opened tab continues to open the target session directly.
• If a browser blocks script-driven closing of an externally launched tab, it safely remains on the target session rather than losing the navigation.

Reliability

• Ignore disconnected/ghost tabs and targets absent from the live session list.