feat(miner-details): add eligibility filter to per-repository standings

[JamesR111]

Summary

Adds an All / Eligible / Ineligible filter to the per-repository standings section on the miner details page, making it easier to focus on repositories that are currently earning (or not earning) rewards on the active track.

Type of Change

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

Screenshots

Before

After

gorec-2026-05-22-06-52-42.webm

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

[anderdc]

Reuse the existing eligibility-filter control instead of duplicating it.

src/components/leaderboard/TopMinersTable.tsx already defines EligibilityToggle (~line 989), the EligibilityFilter type (line 114), and the All/Eligible/Ineligible ELIGIBILITY_OPTIONS array (~line 982). This PR re-declares the same type and options in MinerRepoStandings.tsx and renders a fresh outlined ToggleButtonGroup.

• Extract EligibilityToggle, EligibilityFilter, and ELIGIBILITY_OPTIONS into a shared module and import them in both places — drop the duplicated EligibilityFilter / ELIGIBILITY_FILTER_OPTIONS / ToggleButtonGroup block here.
• EligibilityToggle is the soft pill segmented control already shipped on the leaderboard; the new outlined toggle group is the heavy MUI default, which is why the buttons read as out of place — reusing it makes this filter match the rest of the app.
• The adjacent cards/table view toggle remains an outlined ToggleButtonGroup; style the two consistently so they don't clash side by side.