[release-coo-1.5-ocp-4.19] Fix Perses tooltips background color

[zhuje]

Backport of #1178

Original Change

Fix Perses tooltips background color so they match the PatternFly theme in both light and dark modes.

Backport Target

• Branch: release-coo-1.5-ocp-4.19
• COO LTS

Adaptations Made

• No adaptations needed — PF v6 tokens used directly
• Pre-existing lint errors in dashboard-api.ts and dashboard-list.tsx fixed

Testing

• npm run lint passes
• npm run lint:tsc passes
• npm run test:unit passes

[openshift-merge-bot]

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