All four issues (#427, #441, #443, #474) are fully implemented

[JONAH-6]

Summary

• Add Playwright smoke test for happy-path swap form without wallet dependency
• Cap price history per-asset at 500 entries in addition to the existing global 5000 cap
• Log and surface an explicit warning when fee estimation is requested for an unsupported chain
• Run cargo clippy on the relayer in scripts/verify.sh

Changes

frontend/e2e/swap-smoke.spec.ts (new)

Seven smoke tests cover: page heading, From/To selector visibility, default XLM→BTC route, amount input,
disabled submit with no wallet, wallet-connect hint, and submit staying disabled after amount entry.

backend/app/services/price_oracle.py

Added MAX_HISTORY_PER_ASSET = 500 constant. _record_history now prunes per-asset before applying the global
5000 cap.

backend/tests/test_price_oracle.py

New test_per_asset_history_is_bounded verifies pruning removes excess entries for a single asset.

backend/app/services/fee_estimation.py

Added import logging, logger, and warning: Optional[str] = None field on FeeEstimate. Unsupported
chains now log a warning and set estimate.warning with the message "Chain '...' is not supported for fee estimation.".

backend/tests/test_fee_estimation.py

test_estimate_unknown_chain extended to assert warning is set and contains "not supported".

scripts/verify.sh

Added RELAYER_DIR variable and a second clippy block that runs cargo clippy -- -D warnings on the relayer.
set -euo pipefail ensures non-zero exit on clippy failure.

Closes

Closes #427
Closes #441
Closes #443
Closes #474

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