Add gas converter to mitigate precisebank deprecation

[Eric-Warehime]

Adds an example of how to mitigate the deprecation of precisebank.

[mintlify]

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Project	Status	Preview	Updated (UTC)
cosmos-docs	🟢 Ready	View Preview	Jul 7, 2026, 8:40 PM

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[greptile-apps]

Greptile Summary

This PR adds a new EVM migration guide for replacing x/precisebank. The main changes are:

• New gas-converter migration pages for latest and next.
• Navigation entries under the EVM Migrations group in docs.json.
• Cross-links from the v0.6-to-v0.7 migration guide.
• A work-log entry for the documentation update.

Confidence Score: 4/5

The example code snippets need fixes before merging.

• UnderlyingDenom is referenced but never defined, so copied code fails to compile.
• The ante decorator can panic on an empty transaction.
• The remaining issues are smaller documentation and initialization hardening fixes.

evm/latest/documentation/migrations/gas-converter-migration.mdx and evm/next/documentation/migrations/gas-converter-migration.mdx

Security Review

The added guide is documentation-only, but its ante-handler example includes a reachable empty-transaction panic if copied into an app.

Important Files Changed

Filename	Overview
docs.json	Registers the new migration page under both EVM latest and next.
evm/latest/documentation/migrations/gas-converter-migration.mdx	Adds the main migration guide and example code, with compile and ante-handler issues in the snippets.
evm/next/documentation/migrations/gas-converter-migration.mdx	Mirrors the latest guide and is missing the expected next-page canonical metadata.
evm/latest/documentation/migrations/migration-v0.6-to-v0.7.mdx	Adds a version-correct link to the new latest migration page.
evm/next/documentation/migrations/migration-v0.6-to-v0.7.mdx	Adds a version-correct link to the new next migration page.
work-log/bstm-example-pr.md	Records the added page, navigation registration, cross-link, and warning callout.

_{Reviews (1): Last reviewed commit: "Add gas converter to mitigate preciseban..." | Re-trigger Greptile}

[evanorti]

LGTM. Made a small commit to add frontmatter in /next