🐛 dashboard: time-window filter pills clipped behind following tile

[clubanderson]

Summary

• Move PR throughput time-window pills back into normal grid flow instead of absolutely positioning them over the metric tiles.
• Let the pill row wrap and grow the headline area at narrow widths, aligned right on desktop and left on mobile.
• Move the Hive vs human role dropdown from the tile's top-right corner to the lower-right corner, and constrain that tile's sparkline so the compact select does not overlap it.
• Pin both layout contracts in the dashboard throughput UI test so the controls do not regress to out-of-flow overlays.

Root cause

The PR throughput window controls were absolutely positioned inside .prt-headline with a fixed top padding reservation. When the controls wrapped, especially after the repo/CSV toolbar occupied the row above, the wrapped pills were not counted in layout and overlapped the following metric tile row. Once the pills flowed correctly, the Hive vs human role select was still anchored at the tile's top-right corner directly below those pills, creating a visual collision.

Validation

• gofmt -w src/pkg/dashboard/pr_throughput_ui_test.go
• gofmt -l src/pkg/dashboard/pr_throughput_ui_test.go returned no files
• git diff --check

Per AGENTS.md, local go test is not run for this repository; CI is the test verdict.

[kubestellar-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign danathar for approval. For more information see the Code Review Process.

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[github-actions]

Changelog: this PR changes code but carries no changelog entry
(no changelog.d/ fragment and no CHANGELOG.md edit).

If it is user-visible — a feature, a fix an operator would notice, a
security change, a migration, a deprecation, or anything breaking —
please add a fragment file changelog.d/<category>-<pr-or-slug>.md
containing exactly your entry (see changelog.d/README.md; the
category is one of added/changed/deprecated/fixed/security). Please
do not append to CHANGELOG.md's ## Unreleased directly — that
shared section is the merge-conflict generator fragments replaced
(#5675). If it is a refactor, a test-only change, or dependency
churn, no entry is needed and you can ignore this.

This is a reminder, not a gate; it never blocks a merge.

[github-actions]

Open PR overlap check

Base branch: v5

Conflicts are checked with every PR merged onto the current tip of v5, so a PR that only needs a rebase is not reported as conflicting with its siblings.

PR	Title	Relation	Files
#10614	✨ dashboard: Audit Log collapsed row shows entry rate, last entry, today's count and sensitive-action chip	same files	src/pkg/dashboard/static/index.html
#10613	✨ dashboard: Review Queue collapsed row shows a priority-split history sparkline	same files	src/pkg/dashboard/static/index.html
#10619	✨ dashboard: move project actions to toolbar	same files	src/pkg/dashboard/static/index.html
#10640	🐛 dashboard: surface alerts section at top of page	same files	src/pkg/dashboard/static/index.html
#10589	🐛 fix: route reporter-trust waits through poller relay	same files	src/pkg/dashboard/static/index.html
#10638	🐛 dashboard: Overview open-issue/PR totals explain their gap to the forge counts	same files	src/pkg/dashboard/static/index.html
#10648	🐛 dashboard: overview under-reports total open issues	same files	src/pkg/dashboard/static/index.html
#10618	✨ Improve collapsed Advisory and ACMM headers	same files	src/pkg/dashboard/static/index.html
#10633	✨ dashboard: expose Wavefront (Crustify) work source in settings	same files	src/pkg/dashboard/static/index.html
#10606	✨ dashboard: upgrade bee animation in the top navbar; sidebar pill no longer clips	same files	src/pkg/dashboard/static/index.html
#10647	🐛 dashboard: hide Clear filter / Rescan / Reset layout while Projects is collapsed	same files	src/pkg/dashboard/static/index.html

[github-actions]

Thank you for your contribution! Your PR has been merged.

We'd love to hear how your experience was: share feedback