Add eCash.com (ECX) wallet metadata and guard missing currency entries

[j0ntz]

CHANGELOG

Does this branch warrant an entry to the CHANGELOG?

• Yes
• No

Dependencies

https://github.com/EdgeApp/edge-currency-plugins/pull/457 (for the `ecashcom` plugin itself; this PR is independently mergeable)

Requirements

If you have made any visual changes to the GUI. Make sure you have:

• Tested on iOS device
• Tested on Android device
• Tested on small-screen device (iPod Touch)
• Tested on large-screen device (tablet)

Description

GUI side of the eCash.com (ECX) fork work. ECX is Layer Two Labs' hard fork of Bitcoin, shipped as the ecashcom plugin in EdgeApp/edge-currency-plugins#457; the chain forks from Bitcoin on 2026-08-22 and the fork's own background is written up in that PR.

Asana: https://app.asana.com/0/1215088146871429/1217562074592399

Three changes:

1. Two guards that are not ECX specific. BuyCrypto destructured SPECIAL_CURRENCY_INFO[pluginId] with no fallback, so any wallet whose pluginId has no entry in that table threw Cannot read property 'highPrecisionSyncRatioDisplay' of undefined the moment its transaction list rendered, and the error boundary swapped the app for the crash scene. Every new currency plugin walks into this until someone remembers the table. Now it falls back to an empty record. Separately, long-pressing a transaction to share it built its link with sprintf on the explorer template without checking for the empty string that means "this chain has no explorer", so it shared an empty link; every other explorer consumer (ExplorerCard, RequestScene, AdvancedDetailsCard) already guards that case.

2. An ecashcom entry in SPECIAL_CURRENCY_INFO, matching the other UTXO coins (segwit, UTXO spend targets, key import), plus its wallet-name string.

3. ecashcom: false in the core plugin list, so the asset stays off until the chain actually forks and a Blockbook endpoint for it exists. Enabling it is a one-word flip at launch. There is no public ECX Blockbook server yet, so an enabled wallet could be created but never sync.

A testID on the wallet-list create row comes along for the ride: UI tests had no stable selector for a specific asset's create row, since the row renders its currency code, name and label as one text node.

Testing

• tsc clean, jest green (98 suites, 704 tests), eslint clean on the touched files.
• Driven on the iOS simulator with the ecashcom plugin locally enabled and the dep linked via updot: ECX shows up as a creatable asset, the wallet creates, and opening it renders the wallet scene instead of the crash screen. Before the fix in (1), the same tap produced the "Oops!" crash scene every time.

---

Note

Low Risk
Mostly constants, guards, and disabled plugin wiring; the BuyCrypto fallback is a small defensive fix with broad benefit for new currencies.

Overview
Adds eCash.com (ECX) wallet metadata ahead of the 2026-08-22 Bitcoin fork: SPECIAL_CURRENCY_INFO, allowed-plugin lists, Sign Message menu coverage, default wallet name strings, and ecashcom: false in core plugins so the asset stays hidden until a Blockbook endpoint exists.

Fixes a crash when opening any wallet whose pluginId is missing from SPECIAL_CURRENCY_INFO: BuyCrypto now uses SPECIAL_CURRENCY_INFO[pluginId] ?? {} instead of destructuring undefined.

Transaction share on long-press no longer opens a share sheet with an empty URL when transactionExplorer is an empty string.

Adds a testID on wallet-list create rows (walletListCreateRow_${pluginId}) for UI tests.

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[j0ntz]

📸 Test evidence

ecx create row

ecx wallet created

Captured by the agent's in-app test run (build-and-test).

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