fix(home/chart): Potential Savings by Service honors global filter

[cristim]

Summary

QA Main Header 2.10: Home page "Potential Savings by Service" chart ignored the Main Header global Provider/Account chips. The KPI cards (PR #755) and Savings-over-time chart (PR #747) on the same page already responded; the Service chart was the holdout.

Fix

The Service chart was rendered once on initial mount and never re-rendered on chip changes. Now subscribes to provider + account chip changes with the existing isHomeTabActive guard and queueMicrotask coalescing (mirrors PR #747), refilters the underlying data slice, and renders.

Filter-aware empty state: "No recommendations for " instead of showing the chart with $0 bars.

Files changed

• frontend/src/dashboard.ts
• frontend/src/__tests__/dashboard.test.ts

Test plan

• 74 dashboard tests pass.
• Manual: select Account/Provider chip, confirm Service chart filters consistently with the rest of the Home page.

Closes #867.

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Reviewing files that changed from the base of the PR and between 4956d66 and 130c24b.

📒 Files selected for processing (2)

• frontend/src/__tests__/dashboard.test.ts
• frontend/src/dashboard.ts

✨ Finishing Touches

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• Commit unit tests in branch fix/867-home-service-chart-filter

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[cristim]

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