Prevent chart pointer update loops

[ejsmith]

Summary

• make chart tooltips ignore pointer events so a cursor-following tooltip cannot steal and immediately return chart hover during drag
• let LayerChart perform its built-in brush reset instead of resetting the same brush a second time from application callbacks
• close an open stack detail sheet before saved-view pathname navigation rehydrates the stack list
• cover both production reproductions: dragging the stack timeline and rapidly alternating saved views with stack details open

Root cause

The shared chart tooltip followed the cursor while remaining pointer-interactive. During a pressed drag, it could repeatedly enter the pointer path, hide or unmount, return hover to the chart, and recreate itself inside one reactive flush. Range-enabled dashboard charts also reset LayerChart's brush manually even though the wrapper already resets it after the callback.

Saved-view navigation was a separate overload path: the stack detail subtree remained mounted while each pathname change rehydrated filters, columns, and queries for a different saved view. Rapid navigation therefore updated the outgoing detail graph and incoming list graph together.

Verification

• npm run validate
• npm run build
• focused Playwright stack-effects-chaos.e2e.ts, including a pressed multi-step timeline drag and 20 alternating saved-view navigations with a stack detail open
• GitHub Actions

[github-actions]

Package	Line Rate	Branch Rate	Complexity	Health
Exceptionless.Core	75%	67%	9992	➖
Exceptionless.AppHost	38%	40%	139	❌
Exceptionless.Insulation	37%	35%	286	❌
Exceptionless.Web	85%	69%	7024	✔
Summary	78% (23466 / 30272)	67% (11013 / 16516)	17441	✔