Rebrand: Cake Pay / Cake 2FA / Cake Wallet → Hash Bags across all 31 locale ARBs

Replaced upstream Cake brand references in user-visible ARB *values*
(keys untouched, so generated S.current.<key> references still work):

  - "Cake 2FA" → "Hash Bags 2FA"
  - "Cake Pay" → "Hash Bags Pay" (still gated off via
    FeatureFlag.isCakePayEnabled = false; rebranding the string so it
    doesn't ship literal "Cake" copy if the flag ever flips)
  - "Cake Wallet" → "Hash Bags"
  - "Cake Labs" → "Such Software"
  - "by Cake Pay" → "by Hash Bags Pay"
  - "cakewallet.com" → "such.software"

English-only adjustments (other locales had their own translations):
  - new_first_wallet_text "Keeping your crypto safe is a piece of
    cake" → "Keeping your crypto safe shouldn't be hard" (drops the
    Cake pun, which now reads odd post-rename)
  - outdated_electrum_wallet_description + _receive_warning rewritten
    to Hash-Bags-neutral phrasing: "Hash Bags now uses Electrum V2
    wallets. Bitcoin wallets created in older builds need to be
    replaced; receiving to old wallets may lose funds." Same Hash-Bags-
    neutral rewrite propagated to all locales that had a translated
    version of the original Cake-Electrum-V2 message.

Deliberately not touched:
  - ARB *keys* (cake_2fa_preset, cake_pay_*, cakepay_*, disable_cake_2fa,
    etc.) — keys must stay stable so generated S.current.x references
    keep resolving.
  - "Cupcake" / "cupcake" — a separate companion app referenced in
    restore_*_from_cupcake strings, not part of the Cake brand we're
    rebranding from.
  - Internal Dart identifiers like CakeImageWidget class name.

Also fixed hardcoded titles in lib/src/screens/setup_2fa/setup_2fa.dart:
  - Line 18: title 'Cake 2FA' → 'Hash Bags 2FA'
  - Line 22: cake2FAGuideTitle 'Cake 2FA Guide' → 'Hash Bags 2FA Guide'
  (Local variable name cake2FAGuideTitle kept as-is — it's a code
  identifier, not user-visible.)

33 files touched: 31 ARBs (ar, bg, cs, de, en, es, fa, fr, gn, ha, hi,
hr, hy, id, it, ja, ko, my, nl, pl, pt, pt_BR, ru, th, tl, tr, uk, ur,
vi, yo, zh, zh_tw) + lib/src/screens/setup_2fa/setup_2fa.dart.

lib/src/screens/setup_2fa/setup_2fa.dart

@@ -15,11 +15,11 @@ class Setup2FAPage extends BasePage {
   final Setup2FAViewModel setup2FAViewModel;
 
   @override
-  String get title => 'Cake 2FA';
+  String get title => 'Hash Bags 2FA';
 
   @override
   Widget body(BuildContext context) {
-    final cake2FAGuideTitle = 'Cake 2FA Guide';
+    final cake2FAGuideTitle = 'Hash Bags 2FA Guide';
     final cake2FAGuideUri =
         Uri.parse('https://github.com/Such-Software/hash-wallet');
     return Column(