feat(miners): rebuild details page as a decision-support dashboard

[Dexterity104]

Summary

Rebuilds the miner details page from a stack of separate cards into a single decision-support dashboard. The new layout reads top to bottom as one view:

• Profile hero with the miner identity and a watch action.
• Stat band showing earnings, score, activity, and collateral, each with a peer percentile so the raw figures carry network-relative meaning.
• Next steps: one severity-ranked action list that consolidates what used to be three separate sections (score levers, insights, and the open-PR-risk prompt). The underlying policy maths is unchanged; each step can scroll to the section where it is acted on.
• Repository panel with per-repo standing and unlock progress, driven by the live eligibility gates rather than the retired tier ladder.
• Contribution tabs (pull requests / open issues / activity) filterable by a 1D/7D/30D range that matches the subnet scoring window.

Supporting changes:

• New pure helpers: minerBenchmark (peer percentiles), minerNextSteps (prioritised actions), and expanded minerProgress (unlock progress and network standing).
• New shared components: SegmentedToggle, PercentileBadge, MergeOutcomeBar.
• Shared formatRelativeTimeAgo so recency labels read the same on the leaderboard and the dashboard.
• Removes the superseded components (CredibilityChart, MinerInsightsCard, MinerIdentityRail, MinerRepoStandings, MinerRepoStandingCard, MinerOpenPrRisk, MinerScoreLevers) and the now-unused paths util.

Related Issues

Closes #95
Closes #1324

Type of Change

• Bug fix
• New feature
• Refactor
• Documentation
• Other (describe below)

Screenshots

Checklist

• New components are modularized/separated where sensible
• Uses predefined theme (e.g. no hardcoded colors)
• Responsive/mobile checked
• Tested against the test API
• npm run format and npm run lint:fix have been run
• npm run build passes
• Screenshots included for any UI/visual changes

[Dexterity104]

@e35ventura
Could you please check this PR and give me any feedback?

[anderdc]

not a fan of this UX redesign, too much stuff is happening on the page