fix: thicken the mention circle stroke

Widens the @ ring stroke (1.4 -> 2.1) for a bolder circle around the gem.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GXfHYcViokBQRtqCW9vLQi

amethyst/src/main/res/drawable/ic_notif_mention.xml

@@ -4,7 +4,7 @@
     android:viewportWidth="24"
     android:viewportHeight="24"
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