feat(contacts): richer edit-dialog avatar picker (preview, chips, image, icons)

Four refinements now that the two-column layout has room:

1. Image mode shows a large circular preview of the chosen picture (or a
   placeholder circle with an add-photo glyph, or a broken-image glyph if the
   file went missing), the filename, and centered Choose/Remove buttons —
   instead of a bare button.
2. The live-preview avatar is larger (r20 → r26) and the address is now
   middle-truncated (head + tail) so both ends read, like the real list row.
3. Badge mode shows the two actual chips — Z (shielded) and T (transparent) —
   with labels, making clear the badge is auto-picked from the address type,
   rather than a line of text.
4. The Badge/Icon/Image segmented control gains glyphs (badge / palette /
   image) beside its labels via a small two-font inline control (the shared
   SegmentedControl helper is single-font).

Adds contact_avatar_shielded / _transparent keys and rewords the badge hint
(the chips now carry the Z/T meaning); +8-language translations, all within
the existing CJK subset.

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

res/lang/pt.json

@@ -289,13 +289,15 @@
     "console_zoom_out": "Diminuir zoom",
     "contact_avatar": "AVATAR",
     "contact_avatar_badge": "Selo",
-    "contact_avatar_badge_hint": "Usa o selo de tipo de endereço — Z para blindado, T para transparente.",
+    "contact_avatar_badge_hint": "O selo é escolhido automaticamente conforme o tipo de endereço.",
     "contact_avatar_choose": "Escolher imagem…",
     "contact_avatar_copy_failed": "Não foi possível copiar essa imagem.",
     "contact_avatar_icon": "Ícone",
     "contact_avatar_image": "Imagem",
     "contact_avatar_image_hint": "A imagem é copiada para o app para continuar disponível se o original for movido.",
     "contact_avatar_remove": "Remover",
+    "contact_avatar_shielded": "Blindado",
+    "contact_avatar_transparent": "Transparente",
     "contact_global": "Mostrar em todas as carteiras (contato global)",
     "contact_global_badge_tt": "Contato global — visível em todas as carteiras",
     "contact_global_tt": "Ativado: este contato permanece visível em qualquer carteira que você carregar. Desativado: ele pertence apenas à carteira atual.",