feat: add Issue Discovery mode toggle to leaderboard

[edwin-rivera-dev]

Summary

The leaderboard can now surface Issue Discovery rankings as a section inside the existing miner leaderboard, rather than requiring users to navigate to a parallel /discoveries page.

What changed

src/pages/TopMinersPage.tsx gains a mode toggle (Tabs component) with two values:

• OSS Contributions (default) -existing behavior, sorted by totalScore
• Issue Discovery - sorted by issueDiscoveryScore, uses issueCredibility, isIssueEligible, totalSolvedIssues/totalOpenIssues/totalClosedIssues

When the Discovery mode is active:

• TopMinersTable receives the discovery-mapped dataset and activityLabel="Issues"
• Row clicks route to /discoveries/details with a "Back to Discoveries" back label
• LeaderboardSidebar renders with variant="discoveries"
• Intro copy swaps to the discovery description

State is mirrored to ?mode=discovery via useSearchParams so the tab is deep-linkable and preserved on refresh / back-navigation.

Why this scope

• Reuses TopMinersTable / LeaderboardSidebar without modification - the props already support both modes (the existing DiscoveriesPage is effectively the same page with different field mappings)
• No new API calls; same useAllMiners() hook
• No new route, no new shared helper - keeps the change contained to one file as requested in the issue
• /discoveries and /discoveries/details routes are untouched for backward compatibility; deep links from elsewhere in the app keep working

Type of Change

• Feature / enhancement

Testing

• npm run build
• npm run lint:fix
• Manual on /top-miners:
  • Default view shows OSS Contributions, sorted by totalScore
  • Click "Issue Discovery" tab --> table re-sorts, USD/credibility/activity count reflect issue metrics, URL becomes ?mode=discovery
  • Click a row in Discovery mode --> lands on /discoveries/details?githubId=...
  • Back navigation returns to ?mode=discovery (not OSS)
  • Refresh preserves current mode
  • ?mode=oss or no param --> OSS mode; invalid values --> OSS mode
• Mobile viewport: tab bar is horizontally scrollable / legible

Checklist

• No changes to shared table / sidebar components
• No new dependencies
• Only src/pages/TopMinersPage.tsx touched
• Existing /discoveries page behavior preserved

Follow-ups (out of scope for this PR)

• Extract the OSS↔Discovery field mapping into a shared useLeaderboardMiners(mode) hook once DiscoveriesPage is consolidated
• Decide whether /discoveries should redirect to /top-miners?mode=discovery or remain as a deep-linkable entry point

Updated UI Video

14.04.2026_17.55.21_REC.mp4

Closes #171

[edwin-rivera-dev]

Hi @spider-yamet @anderdc
I picked this up in PR #246

Approach: added a tab toggle at the top of TopMinersPage (OSS Contributions | Issue Discovery), mirroring the mode to ?mode=discovery via useSearchParams so the section is deep-linkable and preserved across back-navigation. The Discovery mode reuses the existing TopMinersTable / LeaderboardSidebar without changes - it's essentially the same field mapping DiscoveriesPage already uses (issueDiscoveryScore, issueCredibility, isIssueEligible, totalSolvedIssues/totalOpenIssues/totalClosedIssues), dropped in as a second memoized dataset.

Scope kept tight: one file (src/pages/TopMinersPage.tsx), ~70 additions, no new hooks or helpers, no new routes, no changes to shared components. /discoveries remains functional so any external deep links keep working - deprecation can be a follow-up.

Acceptance criteria coverage:

• ✅ Issue discovery appears as a section in the existing leaderboard area (as a tab)
• ✅ Ranking uses existing issue discovery metrics from the miner dataset
• ✅ Section distinguishes issue eligibility and issue-focused activity (via activityLabel="Issues" and the discovery sidebar variant)
• ✅ Clicking a miner routes to the existing /discoveries/details view
• ✅ No new standalone leaderboard page introduced

Happy to split this into smaller increments or to also fold the shared field mapping into a hook in the same PR if that fits your conventions better - just let me know.

[anderdc]

conflicts