feat: prevent Liquid send crash on >256 UTXOs via self-transfer consolidation

[wired-pasteque]

What

Fixes the crash when spending from a Liquid wallet holding more than ~256 UTXOs (the confidential-transaction input limit), and adds a guided consolidation flow so the wallet never gets there in the first place.

How it works

1. Crash → catchable error. LwkWalletDatasource.buildPset now
   proactively/reactively detects when a wallet's confirmed L-BTC UTXO count
   exceeds the limit and throws ConsolidationRequiredException instead of
   letting the native call crash the app.
2. Detection. CheckLiquidConsolidationUsecase reads the wallet's
   L-BTC UTXO count and compares it against a threshold set safely below
   the hard limit (250), so the user is warned well before a real spend
   would ever fail.
3. Consolidation. A new consolidation feature lets the user sweep
   their UTXOs into a single self-transfer output (or a few, if the count
   is large enough to need batching)
4. User-facing warning. A ConsolidationRequiredCard banner surfaces
   on the wallet home/detail screens, and inline on the send and swap
   screens, whenever a wallet crosses the threshold — routing to the new
   consolidation screen.

Also fixed along the way

• Partial-broadcast retry gap: if consolidation fails partway through
  broadcasting several batches, the already-succeeded batches' txids are
  now tracked (ConsolidationException.succeededTxids) instead of
  discarded, and the cached preview is cleared on failure so a retry always
  rebuilds fresh PSETs rather than resubmitting an already-broadcast (and
  so already-spent) batch.
• Re-entrancy guard: a fast double-tap on "Consolidate" can no longer
  run the build→sign→broadcast pipeline twice concurrently.
• Silent failures now logged: both the fee-preview build and the
  broadcast step used to swallow failures with no trace; both now log the
  cause via the app's logger.

Tested using small amounts of UTXOs.

Screen.Recording.2026-07-22.at.12.38.06.AM.mov