Mint token batches across chained transactions

[Nebyt]

Summary

• Build one pooled mint transaction per planned chunk, including optional CIP-68 on the last token.
• Wire TokenTab to sign/submit each chunk and advance UTxOs locally so later chunks do not double-spend.

Stack

• Base: feat/csl-mint-helpers
• Depends on: token-batch-plan and csl-mint-helpers (both are already in this branch)
• Merge order: plan → CSL mint helpers → this PR

Test plan

• Single-token mint still works with batching off
• Small batch (2–3 tokens) produces one tx and listed tx ids
• Large batch shows the estimated tx count and asks for one signature per chunk
• CIP-68 last token mints a (333) user token plus a (100) reference token to change

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