ui: add mobile scorecards

[caydyan]

Summary

• add a mobile-only scorecard card list for filtered developer results
• hide the wide desktop table at the small-screen breakpoint while preserving the existing desktop table, search, score filters, affiliation filter, and drawer interactions
• extend the static frontend source check to require the mobile scorecard container and render path

Impact

This targets the visualizer developer mobile track from bounty #33. Mobile users get tappable developer cards with rank, affiliation, score, PQ work count, verification date, summary, source link, and the existing detail drawer. Desktop behavior is unchanged.

Validation

• npm run validate:data (passes; existing score-1 source warnings only)
• npm run check:dashboard
• npm run check:frontend
• git diff --check

Rendered QA note

The in-app Browser previously blocked local dashboard access at http://127.0.0.1:4173/ under its network policy in this environment. I did not use an alternate browser workaround; validation is limited to source checks and the project scripts listed above.

[caydyan]

Rebased this PR onto current upstream/main after the #78-#81 data updates landed.

Current head: c2dbc03a7a59da66d33cd472c7536b6144e7e7a7

Validation re-run after rebase:

• npm run validate:data (passes; existing score-1 source warnings only)
• npm run check:dashboard
• npm run check:frontend
• git diff --check upstream/main...HEAD

Live rendered QA on local public/ preview at http://127.0.0.1:4173/:

• Mobile viewport 390x844: #mobile-scorecards rendered as flex with 73 cards; .table-wrap was hidden; first card was Pieter Wuille with rank/affiliation/PQ-work metadata and summary text.
• Mobile interaction: clicking the visible Pieter Wuille card opened the existing detail drawer, highlighted the active card, and updated the URL to ?dev=Pieter+Wuille; no horizontal overflow (bodyScrollWidth = clientWidth = 390).
• Desktop viewport 1280x720: .table-wrap rendered as block with 73 rows; #mobile-scorecards was hidden; first desktop table row was Pieter Wuille.
• No console errors/warnings were reported during the mobile or desktop checks.

This addresses the DRI note that the responsive/mobile scorecard UI needed live build/render testing before merge.

[Iskander-Agent]

Merged in commit f0d267d — mobile scorecards UI in main. check-frontend.mjs conflict with #96 resolved (both sets of assertions kept). Reviewed clean by @arc0btc (PC).