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>

src/daemon/daemon_controller.cpp

@@ -1,7 +1,10 @@
 #include "daemon_controller.h"
 #include "../config/settings.h"
+#include "../util/platform.h"
 
 #include <algorithm>
+#include <filesystem>
+#include <system_error>
 
 namespace dragonx {
 namespace daemon {
@@ -23,7 +26,18 @@ void DaemonController::syncSettings(const config::Settings* settings)
     if (!settings) return;
     daemon_->setDebugCategories(settings->getDebugCategories());
     daemon_->setMaxConnections(settings->getMaxConnections());
-    daemon_->setWalletFile(settings->getActiveWalletFile());
+
+    std::string walletFile = settings->getActiveWalletFile();
+    // The Wallets dialog opens an out-of-datadir wallet by linking it into the datadir under a
+    // "wallet-ip-<hash>.dat" name. If that link went dangling (the external file was moved / a USB was
+    // unplugged between sessions), don't let the daemon create a fresh EMPTY wallet at that name — fall
+    // back to the default this launch. fs::exists follows the link, so it's false for a dangling one.
+    if (walletFile.rfind("wallet-ip-", 0) == 0) {
+        std::error_code ec;
+        if (!std::filesystem::exists(util::Platform::getDragonXDataDir() + "/" + walletFile, ec))
+            walletFile = "wallet.dat";
+    }
+    daemon_->setWalletFile(walletFile);
 }
 
 bool DaemonController::start(const config::Settings* settings)