Document MerkleVCA campaign type

[PaulRBerg]

Problem

PR #419 bumped sablier to v3.3.0 and updated deployment pages for Airdrops v3.0, but it did not add documentation for the new MerkleVCA (Variable Claim Amount) campaign type.

Currently:

• The campaign creation guide only walks through MerkleLL parameters — VCA is mentioned but not explained
• The campaign verification guide has Etherscan commands for MerkleInstant, MerkleLL, and MerkleLT, but not VCA
• The concepts page has a "Variable Claim Airdrops" section but the info box listing campaign types omits MerkleVCA
• Contract references exist (SablierMerkleVCA, factory, interfaces) but there are no user-facing guides explaining VCA-specific parameters or flows

Solution

Add VCA documentation across the guides and concepts:

1. Campaign creation guide — add a VCA example covering UNLOCK_PERCENTAGE, VESTING_START_TIME, VESTING_END_TIME, AGGREGATE_AMOUNT, and isRedistributionEnabled
2. Campaign verification guide — add VCA Etherscan verification commands
3. Concepts page — include MerkleVCA in the info box that lists campaign types and expand the "Variable Claim Airdrops" section
4. Redistribution & clawback — document how forfeited tokens work when recipients claim early, and how redistribution can be enabled

Note

The autogenerated contract references are already in place — this issue is about the narrative docs (concepts, guides, examples) that help users understand when and how to use VCA campaigns.

Files Affected

Toggle to see affected files

• docs/concepts/05-merkle-airdrops.mdx
• docs/guides/airdrops/examples/02-create-campaign.mdx
• docs/guides/airdrops/_04-campaign-verification.md