fix(ui): Add pending status

[tab]

• Initialize services as pending at profile resolution instead of starting
• Transition to starting only when the runner spawns the process, so the blink animation reflect actual startup activity

[sentry]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.74%. Comparing base (6fdafe0) to head (8f118a0).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #145      +/-   ##
==========================================
+ Coverage   89.66%   89.74%   +0.07%     
==========================================
  Files          66       76      +10     
  Lines        6658     7448     +790     
==========================================
+ Hits         5970     6684     +714     
- Misses        532      600      +68     
- Partials      156      164       +8     

Files with missing lines	Coverage Δ
internal/app/api/handler.go	100.00% <100.00%> (ø)
internal/app/registry/store.go	80.36% <100.00%> (+1.46%)	⬆️
internal/app/ui/components/theme.go	100.00% <100.00%> (ø)
internal/app/ui/services/aside.go	91.26% <100.00%> (+1.74%)	⬆️
internal/app/ui/services/model.go	70.83% <ø> (ø)
internal/app/ui/services/update.go	80.28% <100.00%> (ø)
internal/app/ui/services/view.go	96.93% <100.00%> (+0.01%)	⬆️

... and 14 files with indirect coverage changes

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