feat(wallets): redesign the modal layout — content-sized, framed, aligned

Act on the design review of the Wallets modal (all six points):

1. Content-sized card — size the card to the wallet count (up to 8 rows, then the
   list scrolls) instead of a fixed 620px, killing the huge empty void a short
   list floated in. Computed from the KNOWN row count, so it stays a fixed-height
   dialog (no auto-height feedback — that's what slid content off-screen on a
   monitor move).
2. Framed wallet list — BordersOuter + PadOuterX so the list reads as a contained
   panel with room to grow, not loose rows on the backdrop.
3. Right-aligned numeric columns (Size / Addresses / Balance) and their headers,
   via a custom header row + a right-aligned cell helper, so the numbers line up.
4. Consistent action column — the active wallet's row gets a subtle green tint and
   an "Active" chip (badge), distinct from the Open/Import buttons.
5. De-cluttered bottom — "Create wallet" stays the primary action; the folder-scan
   is tucked behind a "+ Scan another folder…" toggle.
6. Polish — the external-file marker is now a real info icon + tooltip (was
   ICON_MD_FOLDER rendering as a "?" tofu, since that glyph isn't in the subset);
   Refresh is an icon-only button, de-emphasized next to Close.

New i18n keys (wallets_add_folder_toggle, wallets_external_tt) + 8 langs; CJK
subset rebuilt. Verified via the headless sweep at 100% and font_scale 1.5.

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

res/lang/de.json

@@ -1322,6 +1322,7 @@
     "wallets_active": "Aktiv",
     "wallets_add": "Ordner hinzufügen",
     "wallets_add_folder": "Auch einen weiteren Ordner nach Wallet-Dateien durchsuchen:",
+    "wallets_add_folder_toggle": "+ Weiteren Ordner nach Wallets durchsuchen…",
     "wallets_button": "Wallets…",
     "wallets_col_addresses": "Adressen",
     "wallets_col_balance": "Guthaben",
@@ -1332,6 +1333,7 @@
     "wallets_creating": "Wallet wird erstellt — der Node wird neu gestartet…",
     "wallets_current": "aktuell",
     "wallets_exists": "Eine Wallet mit diesem Namen existiert bereits.",
+    "wallets_external_tt": "Außerhalb deines Datenverzeichnisses — mit Import hineinkopieren.",
     "wallets_folder_hint": "/pfad/zum/ordner mit .dat-Wallet-Dateien",
     "wallets_folder_invalid": "Dieser Ordner existiert nicht.",
     "wallets_import": "Importieren",