feat(observability): add node infrastructure section with lazy loading and node events

[Guimove]

Summary

• LazyChart: new IntersectionObserver wrapper that defers chart mounting until in viewport (fixes performance on >24h ranges)
• NodeStatusChart: node count over time with scale events (+1 node / -1 node) shown as reference lines and in the sidebar
• CpuThrottlingChart: % of time container was throttled by CPU limit, added to Resources section
• CardNodeEvents: Prometheus-based table of node infrastructure events (DiskPressure, MemoryPressure, NodeNotReady, Karpenter lifecycle...) filtered by object_kind=~"Node|NodeClaim" with color-coded reasons
• Event sidebar: Repository/Version fields now hidden when empty; redundant timestamp description removed from node scale events

[jul-dan]

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Below, a word from its wisdom :

Help yourself at 2AM by putting some metrics to help observability

[codecov]

Codecov Report

❌ Patch coverage is 2.56410% with 114 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.52%. Comparing base (7304e19) to head (e07c36f).

Files with missing lines	Patch %	Lines
...-dashboard/node-status-chart/node-status-chart.tsx	0.00%	40 Missing ⚠️
...ce-dashboard/card-node-events/card-node-events.tsx	0.00%	22 Missing ⚠️
...oard/cpu-throttling-chart/cpu-throttling-chart.tsx	0.00%	19 Missing ⚠️
...vability/feature/src/lib/lazy-chart/lazy-chart.tsx	0.00%	13 Missing ⚠️
...ib/service/service-dashboard/service-dashboard.tsx	0.00%	9 Missing ⚠️
...ce-dashboard/card-node-status/card-node-status.tsx	0.00%	6 Missing ⚠️
...lity/feature/src/lib/local-chart/event-sidebar.tsx	50.00%	0 Missing and 2 partials ⚠️
...rd/instance-status-chart/instance-status-chart.tsx	0.00%	2 Missing ⚠️
...oard/card-instance-status/card-instance-status.tsx	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           staging    #2462      +/-   ##
===========================================
+ Coverage    46.00%   48.52%   +2.52%     
===========================================
  Files          133      413     +280     
  Lines         3167     9873    +6706     
  Branches       966     3012    +2046     
===========================================
+ Hits          1457     4791    +3334     
- Misses        1377     4166    +2789     
- Partials       333      916     +583     

Flag	Coverage Δ
unittests	48.52% <2.56%> (+2.52%)	⬆️

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[RemiBonnet]

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👉 [PR] staging - feat(observability): add node infrastructure section with lazy loading and node events - 2026-03-11T09:19:39Z

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