Mitra Profil: WhatsApp + Telegram brand glyphs

Replaces the generic chat_bubble + send Material icons with the
official WhatsApp + Telegram glyphs from font_awesome_flutter. Adds
the package as a runtime dep; FA brand glyphs are CC BY 4.0 and the
package itself is MIT.

Visual style is kept consistent with the other rows (pink-soft tile
backing, brand-pink glyph fill) rather than full-brand colors —
matches the figma's monochrome tile pattern.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

mitra_app/pubspec.lock

@@ -480,6 +480,14 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  font_awesome_flutter:
+    dependency: "direct main"
+    description:
+      name: font_awesome_flutter
+      sha256: b9011df3a1fa02993630b8fb83526368cf2206a711259830325bab2f1d2a4eb0
+      url: "https://pub.dev"
+    source: hosted
+    version: "10.12.0"
   freezed_annotation:
     dependency: transitive
     description: