Atomic swaps: restore offer publishing, UI fixes, generic Ethereum RPC settings, any-asset/any-token swaps

[Maxnflaxl]

Warning

DO NOT MERGE UNTIL BeamMW/beam#2075 IS MERGED.

UI side of the atomic-swap repair and extension tracked in #1267. Depends on BeamMW/beam PR issue/2070 — the submodule bump in this branch points at its head; merge that PR first. One commit per issue plus small standalone fix and cleanup commits.

What's in here

#1017 / #1073 — offer publishing restored (submodule bump). Brings the core-side fixes: persisted swap offer publisher address (publishing has thrown ForeignOfferException since 7.3), CLI swap-coin balance validation, the post-funding lock-tx fee-rate check, the fly_client kernel-check fix that unbreaks swap redeems, the generic Ethereum JSON-RPC endpoint, and the core half of any-asset/any-token swaps.

#1129 — first-person labels. Swap amounts are always rendered from the viewer's perspective, but the bare SEND/RECEIVE labels left it ambiguous. The atomic-swap and asset-swap offer tables and the swap create/accept screens (including the token info dialog) now read I SEND / I RECEIVE. Obsolete string ids with no remaining references were dropped; the shared general-send id is untouched.

#1107 — settings section title. "Ethereum node" → "Ethereum" (the section configures the account seed and tokens, not just a node).

BeamMW/beam#1103 — in-progress swap safety note. While coins are locked, the swap details show: "While the swap is in progress, if the other side goes offline your coins will be automatically unlocked in %1 at most." The figure derives from the actual refund-height window (the same computation as the existing in-progress state details), never a hardcoded value, and disappears in terminal states.

#1268 — Ethereum connectivity: Infura or any JSON-RPC endpoint. A provider switcher (same pattern as the Node ↔ Electrum switch): Infura keeps the project-ID flow unchanged; Custom RPC takes any endpoint URL (Alchemy, QuickNode, Chainstack, Ankr, self-hosted). A "Check connection" button reports the detected chain and latest block (eth_chainId/eth_blockNumber) before any swap is attempted; wrong-network endpoints are called out explicitly ("Connected to %1, but Ethereum Mainnet is required"); feedback clears whenever the endpoint fields change, and the check is disabled while edits are unapplied.

#1166 — any Confidential Asset and any ERC-20 token. - Offer creation: the wallet's Confidential Assets and stored custom tokens appear as regular entries in the main currency dropdowns, with their real icons — no separate picker. Assets ride the BEAM side (either direction); balance checks run against the asset, fee checks against BEAM. - Ethereum settings: an add-custom-token flow — enter a contract address, the wallet reads symbol()/decimals() from the contract for confirmation; tokens are stored per wallet and offered as swap currencies. Token amounts convert with the token's real decimals end-to-end. - Accepting: the confirmation screens show the offered token's contract address, symbol and decimals with an explicit warning ("Verify this token contract address carefully. Anyone can create a token with any name."), and the Beam-side asset id/unit name; receiving an asset warns that a small BEAM balance is required for the redeem fee and validates it. - Accepting an asset offer runs its balance/change/fee computations against the offer's asset (BEAM only for the fee), and the redeem-fee BEAM check applies on whichever side receives the asset. - Offer list, rate, currency filter and fit-my-balance are asset- and token-aware with real symbols (contract matching is case-insensitive for EIP-55 addresses), including in-flight swaps on the transactions tab. - Custom-token balance cards on the swaps screen show live balances and the same connection states/settings link as the built-in coin cards.

Settings UX. "Connect more currencies" no longer unfolds every unconnected coin's settings section at once; it navigates with all sections folded (explicit per-coin links still unfold their own section).

Fee-panel fixes. - The recommended fee rate refreshes live: the swap screens re-query the cached rate whenever a swap-coin client reports a new estimate (previously a one-shot read at screen load — opening the screen before the first eth_gasPrice response left "0 / connection error" stuck forever), and an untouched, unfocused fee input adopts the recommendation when it arrives (a field the user is editing is never overwritten). - The fee unit label ("gwei" etc.) is a proper layout child again instead of a zero-sized overlay hack that bled outside the panel on fill-width inputs. - Receiving on the Ethereum side with too little ETH for the redeem-tx gas now says exactly that — "Not enough ETH to pay the redeem transaction fee (%1 needed)" — instead of the generic not-enough-funds message, and ETH-side withdraw fees render in ETH rather than six-digit gwei.

Cleanups. Two refactor commits dedupe what the feature work introduced: one tokenWalletDecimals() for the min(decimals, 9) wire-units rule, shared ERC-20 symbol/amount formatting and token-side helpers in swap_utils, the token-info lookup folded into core Client (GetTokenInfo/OnTokenInfo) instead of a parallel reactor bridge in the UI model, getDefaultFee delegating to getRecommendedFee, and the endpoint-check feedback bound directly to the settings viewmodel.

i18n

All new strings are id-based with English sources; every locale except rs_RS.ts regenerated via lupdate; en_US.ts entries finished.

Testing / QA

The branch builds end-to-end with the bumped submodule (macOS). Core-side behavior is covered by the beam PR's test suites (including CA swaps in both directions against a real node). UI-side manual QA checklist:

• Offer tables and create/accept screens show I SEND / I RECEIVE (atomic + asset swaps, own + foreign offers).
• Create Offer: a Confidential Asset and a custom token are pickable in the main currency dropdowns (icons, correct decimals); the recommended Ethereum fee rate fills in by itself once the endpoint responds.
• Ethereum settings: switcher round-trip; Check connection against a valid endpoint (✓ with chain + block), a garbage URL (✗), and a non-mainnet endpoint on a mainnet build (explicit wrong-network message); settings persist across restart.
• A live custom-token swap: add token in settings, publish an offer, verify the ERC-20 panel and warning on the accepting wallet, confirm the on-chain amount matches the typed value for a token with fewer than 9 decimals.
• A CA swap on testnet: pick the asset in the currency dropdown, acceptor sees asset id/unit name and the BEAM-fee note, transactions tab shows the asset unit name while in flight.
• Swap details during any swap: the auto-unlock note appears while locked and disappears on completion.

Closes #1017, #1073, #1129, #1107, #1268, #1166. Closes BeamMW/beam#1103. Part of #1267.