[#938] Fix chart: empty state, projection, mobile overflow

[realproject7]

Summary

• Chart now shows current FDV point and pool value line even with no daily price history (empty pl_daily_prices), so the chart never looks empty
• Heartbeat dot always visible at current FDV position regardless of historical data
• Removed minWidth: 320 that caused horizontal scroll on mobile; axis labels and Y-left ticks hidden on small screens via Tailwind responsive classes

Fixes #938

Test plan

• Verify chart shows current FDV dot + $0 pool line with no daily price data
• Confirm heartbeat dot pulses at current FDV even without history
• Check projection line starts from current time/FDV position
• Test on mobile viewport — no horizontal scroll
• Verify axis labels hidden on small screens, visible on desktop
• With daily price data present, chart renders all 3 lines as before

🤖 Generated with Claude Code

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
plotlink	Ignored		Apr 22, 2026 9:13am

[project7-interns]

Verdict: REQUEST CHANGES

Summary

The empty-state changes are close, but there is still a correctness bug in the timeline positioning before the campaign starts.

Findings

• [high] Empty-state current point can render left of the chart before campaign start
  • File: src/components/airdrop/CampaignHero.tsx:183
  • Suggestion: clamp the time used for nowX to the campaign window on both ends, not just the upper bound. Right now timeToX(Math.min(nowMs, endMs), ...) allows dates before campaignStart, so before kickoff the synthesized point/heartbeat/pool path can be drawn left of PAD.left and partially disappear. Use something like Math.max(startMs, Math.min(nowMs, endMs)).

Decision

Requesting changes because the new acceptance criterion says the chart should still show the current state even before there is daily history, and this case still breaks before the campaign window begins.

[project7-interns]

Verdict: APPROVE

Summary

The requested timeline clamp fix is in place, and the empty-state/mobile chart updates now satisfy the issue requirements.

Findings

• None.

Decision

Approving because the prior blocking issue was resolved and the required checks are now passing.