feat(wallet): consolidate notes per address, keeping each address's funds in place

Users who keep funds apart under different labelled addresses can now
shed notes (smaller wallet, faster scans/witness rebuilds) without the
funds being merged into a single address.

- Merge/Consolidate dialog: "Where should the funds go?" - Into one
  address (unchanged) or Keep in each address. The latter lists shielded
  addresses with 2+ spendable notes (label, note count, amount;
  too-small ones disabled) and merges each address's notes back into
  that address with z_mergetoaddress [addr] addr. Addresses with more
  notes than the batch size get several batches (the daemon locks a
  batch's notes before returning, so calls take disjoint notes); the
  dialog suggests a second run after those confirm. Per-address
  progress; ops keep running if the dialog is closed. The Consolidate
  (wallet-size) preset opens in this mode; Merge keeps "Into one".
  Shielded only: a transparent address can't take a merge's output.
- services/note_consolidation: groupSpendableNotes, worthConsolidating,
  estimateBatches, consolidateInPlace (pure; driven by a merge-call
  function), with unit tests against a stand-in following dragonxd's
  rules.
- fake_dragonxd: optional note wallet (FAKE_WALLET_NOTES,
  FAKE_MERGE_SECS) with z_mergetoaddress and its operations.
- i18n: 17 new keys in all 8 languages; CJK subset rebuilt.
- UI sweep: modal-consolidate target.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/app_sweep.cpp

@@ -401,6 +401,10 @@ void App::buildSweepCatalog()
     add("modal-merge", ui::NavPage::Send,
         [](App&) { ui::ShieldDialog::showMerge(); },
         [](App&) { ui::ShieldDialog::hide(); });
+    // Consolidate (wallet-size preset): keeps each address's funds in that address by default.
+    add("modal-consolidate", ui::NavPage::Send,
+        [](App&) { ui::ShieldDialog::showConsolidate(); },
+        [](App&) { ui::ShieldDialog::hide(); });
     // z->t transfer so the (converted) deshielding DialogWarningHeader renders.
     add("modal-transfer", ui::NavPage::Overview,
         [](App& a) {