Update Import transaction's UI

[jeesunikim]

• Remove labels around <Signatures/> per design
• Don't skip "Sign" step on behalf of user when imported transaction has a signature. Previously, we skipped it to Submit so that its signature can be verified first; however, it's too much of handholding. Instead, display a Signatures table in Sign transaction and let them decide
• We skip "Sign" and go directly to "Submit" if offline check can verify that all required signatures are signed for the tx
• Submit transaction's details to include signature verification
• Sign transaction to include decoded XDR in JSON (included a language dropdown to switch JSON <> XDR)
• Replaced "unrecognized signers" (multisig that can't be verified offline) text with "Existing signer (unverified)"

TX samples:

• tx with no signatures: AAAAAgAAAADSBFf5wA+BWEc1jDmwvbVupg1OrohBSRvHtEUG0FmTSwAAAGQAJoazAAAAFgAAAAAAAAAAAAAAAQAAAAAAAAABAAAAALeAVmIAOom1tFe0PE2ZHWOn+hSTZuYY136c6XpoWKBVAAAAAAAAAAAC+vCAAAAAAAAAAAA=
• tx with multisig as a source within operation: AAAAAgAAAADSBFf5wA+BWEc1jDmwvbVupg1OrohBSRvHtEUG0FmTSwAAAGQAJoazAAAAFgAAAAAAAAAAAAAAAQAAAAEAAAAAeH8YX2LLiZESynVxH8gRYbkGo9kp9WvTIKpupYBaGOwAAAABAAAAALeAVmIAOom1tFe0PE2ZHWOn+hSTZuYY136c6XpoWKBVAAAAAAAAAAAC+vCAAAAAAAAAAAGAWhjsAAAAQH33HKhPjIpWCuTTg0UwM2za+/cipMaDdrFliHBTmRcNRck0XW3Y5AYY4xu2+u/cUEzShd+1V2b7sRZdO8adGwg=
• tx with multisig: AAAAAgAAAADSBFf5wA+BWEc1jDmwvbVupg1OrohBSRvHtEUG0FmTSwAAAGQAJoazAAAAFwAAAAAAAAAAAAAAAQAAAAAAAAABAAAAACHl1hdsb68IKFCwYxh+DyTYAFNPPQYeXIdl3VD5t/10AAAAAAAAAAAC+vCAAAAAAAAAAAGAWhjsAAAAQHj3NcCOYERqouBvL0Uv3rQ91qNkxi0H28W9g2d8MA4pRAjzU9q1v3mDsiA3EJMaxMhyy4JISzC8OXkqBiqNJQI=
• tx with all required signatures: AAAAAgAAAADSBFf5wA+BWEc1jDmwvbVupg1OrohBSRvHtEUG0FmTSwAAAGQAJoazAAAAFgAAAAAAAAAAAAAAAQAAAAEAAAAAeH8YX2LLiZESynVxH8gRYbkGo9kp9WvTIKpupYBaGOwAAAABAAAAALeAVmIAOom1tFe0PE2ZHWOn+hSTZuYY136c6XpoWKBVAAAAAAAAAAAC+vCAAAAAAAAAAAKAWhjsAAAAQH33HKhPjIpWCuTTg0UwM2za+/cipMaDdrFliHBTmRcNRck0XW3Y5AYY4xu2+u/cUEzShd+1V2b7sRZdO8adGwjQWZNLAAAAQJ+YFFwUakiYWFhB2jKpXcLRTx0cbhni+6in7ui/vsZ037XGCUq9nm2yjNSamzO00qEvkGoKpAEKdpSTnakIDwM= (skips to submit)

Screenshots:

• Signature under Sign step

• Signature under Import

• "Sign transaction" step to include decoded details

• "Submit transaction" step to include verified signature

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[Copilot]

Pull request overview

Updates transaction import/sign/submit UI to expose signatures, decoded XDR, and verification details while improving stale-state handling.

Changes:

• Adds signature context and JSON/XDR views.
• Adjusts multisig routing and messaging.
• Adds regression tests and footer layering fixes.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
tests/e2e/signStepContent.test.ts	Updates signed-result assertions.
tests/e2e/importMultisigSubmit.test.ts	Tests multisig submission routing.
tests/e2e/buildFlowResetOnEdit.test.ts	Tests stale-signature reset.
src/styles/globals.scss	Raises submit dropdown layering.
src/helpers/checkRequiredSignatures.ts	Revises offline completeness semantics.
src/constants/networkLimits.ts	Refreshes generated limits.
src/components/TransactionFlowFooter/styles.scss	Changes footer stacking.
src/app/(sidebar)/transaction/styles.scss	Removes legacy XDR styles.
src/app/(sidebar)/transaction/import/page.tsx	Adds signature context and submission fallback.
src/app/(sidebar)/transaction/import/components/SignStepSignatureContext.tsx	Adds signature-status panel.
src/app/(sidebar)/transaction/import/components/ImportStepContent.tsx	Simplifies import messaging.
src/app/(sidebar)/transaction/components/SubmitStepContent.tsx	Adds decoded transaction verification view.
src/app/(sidebar)/transaction/components/SignStepContent.tsx	Adds hash and JSON/XDR display.
src/app/(sidebar)/transaction/components/Signatures.tsx	Revises multisig terminology.
src/app/(sidebar)/transaction/build/page.tsx	Resets stale downstream state.

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[quietbits]

Unrelated to this PR, UI suggestion to hide "All" chip if there is only one operation type.