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/ko.json

@@ -289,13 +289,15 @@
     "console_zoom_out": "축소",
     "contact_avatar": "아바타",
     "contact_avatar_badge": "배지",
-    "contact_avatar_badge_hint": "주소 유형 배지를 사용합니다 — Z는 보호, T는 투명.",
+    "contact_avatar_badge_hint": "배지는 주소 유형에 따라 자동으로 선택됩니다.",
     "contact_avatar_choose": "이미지 선택…",
     "contact_avatar_copy_failed": "그 이미지를 복사할 수 없습니다.",
     "contact_avatar_icon": "아이콘",
     "contact_avatar_image": "이미지",
     "contact_avatar_image_hint": "이미지는 앱에 복사되어 원본이 이동해도 계속 사용할 수 있습니다.",
     "contact_avatar_remove": "제거",
+    "contact_avatar_shielded": "보호",
+    "contact_avatar_transparent": "투명",
     "contact_global": "모든 지갑에 표시(전역 연락처)",
     "contact_global_badge_tt": "전역 연락처 — 모든 지갑에서 표시됨",
     "contact_global_tt": "켜짐: 어떤 지갑을 불러오든 이 연락처가 계속 표시됩니다. 꺼짐: 현재 지갑에만 속합니다.",