Add workflow label UI support

[jiaenren]

Summary

Issue - None

[OSMO-6501] Track B9 of the workflow-labels PR split — the final feature PR of the stack.

• Workflow list: Labels column plus label / no_label filter chips (selector syntax with * and (a|b) passes through to the list API).
• Detail page: stored labels and the recomputed warn-mode policy warnings (shown for every status, including completed runs).
• Resubmit panel: carries the workflow's labels forward and allows per-run edits via the label editor.
• New-workflow submit page: labels come from the spec editor (no separate widget that could drift), with the config panel surfacing parsed labels.
• Shared workflow-labels formatting module; API types consumed through the adapter layer per the repo convention.

Stacked on #1226; functionally depends on #1223 and #1224. Extracted from prototype #1194.

Testing

Verified against main's Next.js 16.2.11 (#1230):

• pnpm vitest run — 46 files, 1017 tests pass (includes new actions, columns, search-fields, shim, and label-formatting tests)
• pnpm exec tsc --noEmit, pnpm exec eslint src --max-warnings 0
• pnpm build passes
• Playwright journeys updated (submit form, detail overview, filters, resubmit panel); run in CI

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

🤖 Generated with Claude Code

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[codecov]

Codecov Report

❌ Patch coverage is 70.58824% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.00%. Comparing base (f3bcad8) to head (ce36dbf).

Files with missing lines	Patch %	Lines
src/ui/src/lib/api/adapter/workflows-shim.ts	44.44%	1 Missing and 4 partials ⚠️
src/ui/src/lib/api/server/workflows.ts	0.00%	4 Missing ⚠️
src/ui/src/lib/workflow-labels.ts	95.23%	1 Missing ⚠️

Additional details and impacted files

@@                          Coverage Diff                          @@
##           jiaenr/osmo-6501-b8-label-metrics    #1227      +/-   ##
=====================================================================
+ Coverage                              66.91%   67.00%   +0.09%     
=====================================================================
  Files                                    202      203       +1     
  Lines                                  26076    26109      +33     
  Branches                                3942     3952      +10     
=====================================================================
+ Hits                                   17448    17494      +46     
+ Misses                                  7887     7854      -33     
- Partials                                 741      761      +20     

Flag	Coverage Δ
backend	69.61% <ø> (ø)
ui	38.07% <70.58%> (+1.56%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/ui/src/lib/api/adapter/types.ts	100.00% <ø> (ø)
src/ui/src/lib/workflow-labels.ts	95.23% <95.23%> (ø)
src/ui/src/lib/api/server/workflows.ts	0.00% <0.00%> (ø)
src/ui/src/lib/api/adapter/workflows-shim.ts	44.82% <44.44%> (+44.82%)	⬆️

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