[Airdrop] Update stats row: replace PL Earned with FDV and Target Progress

[realproject7]

Parent: #877

Problem

The stats row below the countdown shows "Participants / PL Earned / PLOT Price". "PL Earned" is a user-specific metric in a global section — doesn't belong here.

Fix

Change the 3 stats boxes to:

Box	Label	Value
1	Participants	Total unique addresses earning points
2	FDV	Current FDV value (price × 1M), labeled "FDV"
3	Target Progress	Progress % toward the next milestone target

Target Progress box details

• Show a mini progress bar inside the box
• Title changes dynamically based on current zone:
  • Pre-Bronze: "Progress to 🥉 Bronze"
  • Bronze reached: "Progress to 🥈 Silver"
  • Silver reached: "Progress to 🥇 Gold"
  • Gold reached: "Progress to 💎 Diamond"
  • Diamond reached: "💎 Diamond Achieved!"
• Progress % = currentFDV / nextMilestoneTargetFDV × 100
• Example: FDV $500K, next target $1M → "50%" with label "Progress to 🥉 Bronze"

Files

• src/components/airdrop/CampaignHero.tsx — stats row section

Acceptance Criteria

• Box 1: Participants count
• Box 2: Current FDV (labeled "FDV")
• Box 3: Progress % toward next milestone with dynamic label
• Progress bar visual inside box 3
• Label updates as milestones are reached