feat-686-dashboard-portfolio-kpis

[EcstaceeLOR]

Summary

Adds high-level portfolio KPIs to the dashboard so users can understand stream activity at a glance.

Changes

• Shows active stream count across sending and receiving streams.
• Calculates the active run rate from every active stream.
• Displays total value streamed as claimed plus currently withdrawable value.
• Adds an expiring-soon count for streams ending in the next seven days.
• Deduplicates streams by contract address when a wallet is both sender and recipient.

Verification

• Reviewed the metric calculations against the existing StreamInfo and withdrawable-balance data flow.
• Local typecheck/test execution is pending because the environment cannot complete dependency installation without its certificate chain; this repository currently exposes no PR checks.

Closes #686

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