bdk_demo: Home shows pending funds as balance; add pending tx summary under Send/Receive

[Johnosezele]

Summary

On bdk_demo Home, an incoming unconfirmed transaction bumps the main Balance figure (BDK total) even though Trusted spendable stays at 0. Transaction History already labels the row as pending / "Awaiting confirmation", but Home has no pending-transaction affordance under Send/Receive.

Expected UX: keep the primary balance at confirmed/spendable 0 (or explicitly confirmed), and surface pending activity below Send/Receive until confirmation.

Current behavior

Reproduced on Testnet 3 with a fresh wallet that just received 2000 sats (unconfirmed):

Surface	Observed
Home Balance	2000 sat
Home Trusted spendable	0 sat
Sync	green / up to date
Transaction History	+2000 sat with pending / "Awaiting confirmation"
Transaction Detail	status pending

Home balance is wired to WalletBalanceSnapshot.totalSat (wallet.balance().total), which includes untrusted pending. Pending breakdown fields (trustedPendingSat / untrustedPendingSat) are already captured in the snapshot but not shown as a Home pending section.

Relevant code today:

• bdk_demo/lib/features/home/home_page.dart — _BalanceCard displays totalSat
• bdk_demo/lib/providers/blockchain_providers.dart — applyFromWallet stores total + pending buckets
• bdk_demo/lib/features/transactions/* — pending mapping/UI already exists for history/detail

Expected behavior

1. Primary Home balance reflects confirmed / trusted-spendable funds (so it stays 0 while the only UTXO is untrusted pending).
2. Pending transaction display below the Send/Receive row when trustedPending / untrustedPending (or pending txs) are non-zero — e.g. "+2000 sat pending" with link into Transaction History/detail.
3. After confirmation + sync, pending section clears and primary balance updates.

Why this matters

Users read the large Balance number as spendable. Showing pending as the hero balance contradicts Trusted spendable 0 and the pending labels already used in history/detail.

Suggested approach (non-binding)

• Drive the hero figure from confirmedSat and/or trustedSpendableSat (product choice; document which).
• Optionally show a secondary line for total including pending.
• Add a compact pending summary under Send/Receive fed by balance pending buckets and/or a short list from transactionsRepository filtered to pending == true.
• Invalidate/refresh that Home section after sync (same gap as history not auto-reloading after sync).

Related

• Continues the real wallet history work in feat: load real transaction history in demo app #102 (pending rows already work in history; Home UX does not).
• Note: tb1… is shared by Signet and Testnet 3 — cross-network sends look valid but will not appear on the other chain; unrelated to this UX issue but easy to confuse while testing.

Acceptance criteria

• With only an unconfirmed receive, Home hero balance stays 0 (confirmed/spendable semantics).
• Home shows a pending indicator/summary below Send/Receive for that receive.
• After the tx confirms and the wallet syncs, pending UI clears and hero balance includes the funds.
• Widget coverage for Home with untrusted-pending-only snapshot.