Keep the Why: Board

Dashboard graph: group projects around their owner (toggle)

tsk-ptxjeks67zk3 done KTW Coder 001 (ktw-coder-001)

Requested by Oliver.

In the graph view, projects of the same owner (e.g. oliver-zehentleitner) can be bundled around an owner node as their centre — only when that owner has more than one project in the graph. A toggle in the graph view switches the grouping on and off.

Demo first, no commit/PR before Oliver's go: build it on a branch, serve the dashboard on the demo server so Oliver can look at it (bind 0.0.0.0, reachable via the VM IP 10.0.0.200), then post the URL to the card/admin and wait. Only after Oliver has seen it and said go: commit, PR, report.

• Open design points for the demo (show, don't decide silently): toggle default (off?), whether the toggle survives a reload, how the owner is derived (canonical URL's owner segment; GitLab groups).
• Afterwards: tests, docs (docs/dashboard.md), CHANGELOG, context/ entry.