* gui: open a workspace details card from the breadcrumb

After t3code's thread details: branch, path with Copy Path, agents, the task and its PR status, change totals read on open with a hand-off to the Changes panel, and Open Folder.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* docs: specify the workspace details card

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* gui: keep the inactive breadcrumb undimmed and the details card current

Review fixes: lift libadwaita's disabled-menubutton filter, pick the latest task among a workspace's task panes, close the card on a workspace switch, and give the PR row and breadcrumb readable accessible text. details() gains unit tests.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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Co-authored-by: Lucenx9 <185146821+Lucenx9@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>