Fix gas estimation for Dynamic wallet contract writes

[tom2drum]

Description and Related Issue(s)

Dynamic WaaS wallets were sending contract write transactions with gas: 0, which broke writes. This PR estimates gas via the public client and passes a buffered limit instead.

Proposed Changes

• Estimate gas for Dynamic WaaS writes (dynamicwaas) instead of hardcoding 0
• Share encoding + estimation in estimateTransactionGas (viem public client, so disconnected read/simulate still work)
• Apply a 20% gas buffer on Dynamic writes to reduce OOG between estimate and inclusion
• Only run gas estimation on public-client paths that need it (simulate / fallback / receive), not plain reads

Breaking or Incompatible Changes

None.

Additional Information

N/A

Checklist for PR author

• I have tested these changes locally.
• I added tests to cover any new functionality, following this guide
• Whenever I fix a bug, I include a regression test to ensure that the bug does not reappear silently.
• If I have added a feature or functionality that is not privacy-compliant (e.g., tracking, analytics, third-party services), I have disabled it for private mode.
• If I have added, changed, renamed, or removed an environment variable
  • I updated the list of environment variables in the documentation
  • I made the necessary changes to the validator script according to the guide
  • I added "ENVs" label to this pull request

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