perf(net): one balance scan per poll, filtered opstatus, a guarded merge scope

The Core poll ran z_gettotalbalance twice (minconf 0 and 1), each a whole-
wallet scan under dragonxd's cs_main. The spendable (minconf=1) call now
runs only after the display call succeeded, and only when something is
unconfirmed or pending or the exact total moved: about 95% of polls make
one scan instead of two. A forced post-send balance can no longer be lost
to a refused enqueue, and pending-send debits aren't re-applied each tick.

z_getoperationstatus is filtered to our opids with its real argument form
([[id,...]]; the old ["id"] was rejected), falling back to the unfiltered
call if a daemon refuses the filter. The Shield/Merge dialog's own polls
are filtered and session-guarded too, and finally reach Done; the dead
RPCClient wrappers are deleted.

The Merge/Consolidate scope scan becomes a tested state machine: one scan
at a time, failures latch behind a Retry button, only "node not ready"
retries by itself (10/30/60 s, at most 3), Lite never scans. Its 120 s
calls are maintenance calls: every main-thread disconnect aborts one in
flight first, so a lifecycle action no longer freezes the UI behind it.
An aborted merge that was already sent says it may still go through.

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

res/lang/ja.json

@@ -1178,10 +1178,12 @@
     "merge_keep_each_status_failed": "%s — 失敗：%s",
     "merge_keep_each_status_not_started": "%s — 開始されませんでした：%s",
     "merge_keep_each_status_running": "%s — %d 件のノートを統合中（%d / %d 回完了）…",
+    "merge_keep_each_status_unconfirmed": "%s — ステータスを確認できませんでした",
     "merge_keep_each_too_small": "少なすぎて統合できません。手数料でこの資金がなくなります。",
     "merge_max_inputs": "バッチあたりの最大入力数",
     "merge_no_spendable": "統合できる使用可能な入力がまだありません。",
     "merge_progress": "統合中… 数分かかることがあります。このウィンドウは閉じても構いません。",
+    "merge_scope_failed_fmt": "入力を読み取れませんでした: %s",
     "merge_scope_fmt": "透明%d件 + シールド%d件の入力　·　使用可能 約%s DRGX",
     "merge_scope_loading": "入力を確認中…",
     "merge_send_failed": "マージに失敗しました: ",
@@ -1190,7 +1192,10 @@
     "merge_src_shielded": "シールド",
     "merge_src_transparent": "透明",
     "merge_started": "統合操作を開始しました",
+    "merge_submit_uncertain": "接続が中断される前に、ノードはマージを確認しませんでした。マージは実行される可能性があります — 再接続後、もう一度マージする前に「履歴」を確認してください。",
     "merge_title": "アドレスに統合",
+    "merge_wait_locked": "ウォレットがロックされています。続行するにはロックを解除してください。",
+    "merge_waiting_node": "ノードを待っています…",
     "merge_where": "資金の移動先",
     "mig_adopt": "これを自分のウォレットにする",
     "mig_adopt_now": "シードウォレットを採用",