Upgrade sdk, store, comet versions

[Eric-Warehime]

Upgrades versions of sdk, store, and cometbft. Encompasses:

• removal of sign mode textual
• removal of trace store
• updated module account for x/staking based on validator key rotation.

[greptile-apps]

Greptile Summary

The PR upgrades the Cosmos SDK, store, CometBFT, and Go toolchain while adapting application wiring and supporting developer workflows.

• Removes obsolete textual-signing and trace-store integration.
• Adds the staking key-rotation fee-pool module account.
• Updates store imports and module constructors for the new SDK APIs.
• Aligns Docker builds, simulation targets, version metadata, tests, and tutorials with the upgraded stack.
• Adds an Unreleased changelog entry documenting the dependency upgrade and associated compatibility changes.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
go.mod	Upgrades the Go toolchain and core Cosmos SDK, store, and CometBFT dependencies.
app.go	Adapts application construction, module accounts, module registration, store imports, and service wiring to the upgraded SDK.
exampled/cmd/root.go	Removes textual sign-mode configuration that is no longer supported by the upgraded SDK.
exampled/cmd/commands.go	Removes obsolete trace-store arguments from application startup and export callbacks.
Dockerfile	Aligns the container toolchain with go.mod and uses BuildKit-provided target platform values.
CHANGELOG.md	Adds detailed Unreleased documentation for the dependency upgrade and related compatibility work.

_{Reviews (2): Last reviewed commit: "update docs" | Re-trigger Greptile}

[linear-code]

FOU-1102

[evanorti]

@greptileai plz rereview

[evanorti]

LGTM. Added some docs changes.

[evanorti]

@Eric-Warehime Feel free to merge plz