feat(wallets): open external wallets in place via datadir link (no copy)

Replace the "Import" action — which copied an out-of-datadir wallet into the
datadir and cluttered the list with hard-to-tell-apart duplicates — with an
in-place "Open" that links the real file into the datadir under a stable
per-target name (wallet-ip-<FNV8>.dat) and switches to it. The daemon only
loads a bare filename from its own datadir, so a link is the minimal bridge:
hard link first (no privileges, same volume — covers non-admin Windows),
symlink fallback (cross-volume), then an error. Never a copy (that would fork
the wallet) and never a delete of a real file.

Also:
- show each external wallet's originating sub-directory (…/Backups/2021)
- add a per-row "open folder location" button
- widen the modal (780 → 860) for the extra button
- guard the daemon against a dangling link (external file moved / USB
  unplugged) by falling back to wallet.dat rather than creating an empty one

Per-target link names (not one shared name) make switching between two
external wallets a real -wallet switch, so the rescan/cache index tracks each
correctly. Drops the now-dead wallets_import* i18n keys and back-fills the new
open/folder strings across all 8 languages + rebuilds the CJK subset.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

res/lang/zh.json

@@ -1344,20 +1344,18 @@
     "wallets_creating": "正在创建钱包——节点将重启…",
     "wallets_current": "当前",
     "wallets_exists": "已存在同名钱包。",
-    "wallets_external_tt": "位于数据目录之外 — 导入以将其复制进来。",
+    "wallets_external_tt": "在数据目录之外 —「打开」会就地链接（不复制）。",
     "wallets_folder_hint": "/含 .dat 钱包文件的文件夹路径",
     "wallets_folder_invalid": "该文件夹不存在。",
-    "wallets_import": "导入",
-    "wallets_import_failed": "无法导入该钱包文件。",
-    "wallets_import_hint": "导入以打开",
-    "wallets_import_tt": "此钱包位于数据目录之外。打开它会先将其复制进来（即将推出）。",
-    "wallets_imported": "钱包已导入——正在切换…",
     "wallets_intro": "位于您数据目录（以及您添加的任何文件夹）中的钱包文件。打开一个即可切换——节点将重启以加载它，且每个钱包各自保留其数据。",
     "wallets_name_invalid": "请输入有效的钱包名称。",
     "wallets_never": "从未打开",
     "wallets_new_hint": "名称（例如 savings）",
     "wallets_new_label": "创建新钱包：",
     "wallets_open": "打开",
+    "wallets_open_failed": "无法在原位置打开此钱包。它可能与数据目录位于不同的驱动器上 — 请将其移动到同一驱动器（在 Windows 上，启用开发者模式也可跨驱动器链接）。",
+    "wallets_open_folder": "打开文件夹位置",
+    "wallets_open_inplace_tt": "在原位置打开此钱包 — 链接到数据目录（不复制）",
     "wallets_reveal": "打开文件夹",
     "wallets_sort_addresses": "地址",
     "wallets_sort_asc": "升序（最早/最少/最小优先）",