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/zh.json

@@ -1178,10 +1178,12 @@
     "merge_keep_each_status_failed": "%s——失败：%s",
     "merge_keep_each_status_not_started": "%s——未开始：%s",
     "merge_keep_each_status_running": "%s——正在合并 %d 张票据（已完成 %d/%d 批）…",
+    "merge_keep_each_status_unconfirmed": "%s——无法确认状态",
     "merge_keep_each_too_small": "金额太小，无法整合：手续费会耗尽这些资金。",
     "merge_max_inputs": "每批最大输入数",
     "merge_no_spendable": "暂无可合并的可用输入。",
     "merge_progress": "正在合并…这可能需要几分钟。您可以关闭此窗口。",
+    "merge_scope_failed_fmt": "无法读取您的输入：%s",
     "merge_scope_fmt": "%d 笔透明输入 + %d 笔屏蔽输入 ・ 约 %s DRGX 可用",
     "merge_scope_loading": "正在检查您的输入…",
     "merge_send_failed": "合并失败：",
@@ -1190,7 +1192,10 @@
     "merge_src_shielded": "屏蔽",
     "merge_src_transparent": "透明",
     "merge_started": "合并操作已开始",
+    "merge_submit_uncertain": "连接中断前节点未确认合并。合并仍可能完成——重新连接后，请先在“历史”中确认，再重新合并。",
     "merge_title": "合并到地址",
+    "merge_wait_locked": "钱包已锁定。请解锁后继续。",
+    "merge_waiting_node": "正在等待节点…",
     "merge_where": "资金应转到哪里？",
     "mig_adopt": "将其设为我的钱包",
     "mig_adopt_now": "采用助记词钱包",