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/es.json

@@ -289,13 +289,15 @@
     "console_zoom_out": "Alejar",
     "contact_avatar": "AVATAR",
     "contact_avatar_badge": "Insignia",
-    "contact_avatar_badge_hint": "Usa la insignia de tipo de dirección: Z para blindada, T para transparente.",
+    "contact_avatar_badge_hint": "La insignia se elige automáticamente según el tipo de dirección.",
     "contact_avatar_choose": "Elegir imagen…",
     "contact_avatar_copy_failed": "No se pudo copiar esa imagen.",
     "contact_avatar_icon": "Icono",
     "contact_avatar_image": "Imagen",
     "contact_avatar_image_hint": "La imagen se copia en la app para que siga disponible si el original se mueve.",
     "contact_avatar_remove": "Quitar",
+    "contact_avatar_shielded": "Blindada",
+    "contact_avatar_transparent": "Transparente",
     "contact_global": "Mostrar en todas las carteras (contacto global)",
     "contact_global_badge_tt": "Contacto global — visible en todas las carteras",
     "contact_global_tt": "Activado: este contacto permanece visible sin importar qué cartera cargues. Desactivado: pertenece solo a la cartera actual.",