Airdrop hero: remove burn bar and pool value table

[realproject7]

What to remove

1. Burn bar section — "IF THE CAMPAIGN ENDED RIGHT NOW..." with the red/green bar, burned/distributed percentages, current MCap and pool value
2. "YOUR AIRDROP GROWS WITH $PLOT" table — the Now/Step 1-4 table showing MCap and pool values, plus the summary text below it

These sections add complexity without enough value. The milestone cards (ticket #1026) will be the primary visualization.

Files

• `src/components/airdrop/CampaignHero.tsx` — remove `BurnBar` component and the "Your airdrop grows" table section

Acceptance Criteria

• Burn bar removed
• Pool value table removed
• No layout breakage — remaining sections flow naturally