accounts list: use available balance, show blocked amount as secondary line

BML CASA rows on the accounts list were showing currentBalance (the
working/ledger balance, which includes blocked funds). Every other
balance display in the app — transfer screen, contact picker, QR pay,
dashboard totals — uses availableBalance, so the same account was
showing a different figure depending on where you looked at it.

This switches the accounts list to availableBalance for consistency,
and adds a small muted "MVR X.XX blocked" line beneath the balance
when blocked > 0 so the blocked funds are still visible at a glance.
Only BML reports a non-zero blocked amount; MIB and Fahipay rows are
unaffected.

The per-account history page header is untouched — its three-column
Available / Balance / Blocked breakdown still works as before.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/src/main/java/sh/sar/basedbank/ui/home/AccountsAdapter.kt

@@ -125,6 +125,14 @@ class AccountsAdapter(
             binding.tvAccountNumber.text = display.number
             binding.tvAccountType.text   = display.typeLabel
             binding.tvBalance.text       = if (hideAmounts) maskAmount(display.balance) else display.balance
+            val blocked = display.blockedBalance
+            if (blocked != null) {
+                val shown = if (hideAmounts) maskAmount(blocked) else blocked
+                binding.tvBlocked.text       = binding.root.context.getString(R.string.account_blocked_label, shown)
+                binding.tvBlocked.visibility = View.VISIBLE
+            } else {
+                binding.tvBlocked.visibility = View.GONE
+            }
             binding.btnTransfer.setOnClickListener { onTransferClick?.invoke(account) }
             binding.root.setOnClickListener { onAccountClick(account) }
             binding.root.setOnLongClickListener {