Improve floating table controls

[ejsmith]

Summary

• add a subtle, theme-aware glow only while floating table controls are stuck
• keep the first row visible beneath the controls when paging without returning to the charts
• preserve the floating controls on short result pages and cover the behavior with unit and browser tests

Verification

• npm run validate
• npm run test:unit -- --run src/lib/features/shared/components/data-table/data-table-pager.svelte.test.ts
• E2E_URL=https://web-ex.dev.localhost:32985 E2E_CAPTURE_PAGER_TOOLBAR_SCREENSHOTS=true npm run test:e2e -- --project=chromium e2e/tests/table-toolbar-pagination.e2e.ts

Breaking changes

None.

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[chatgpt-codex-connector]

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Reviewed commit: 25558b922b

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[github-actions]

Package	Line Rate	Branch Rate	Complexity	Health
Exceptionless.Insulation	37%	35%	286	❌
Exceptionless.Core	76%	67%	10280	✔
Exceptionless.Web	85%	69%	7974	✔
Exceptionless.AppHost	38%	41%	147	❌
Summary	78% (25503 / 32506)	68% (11956 / 17711)	18687	✔