fix(list): anchor the unread dot on the first line, not the row midpoint

The dot added in #27 is positioned with `top: '50%'`, so it centres on the
whole row. Rows are three lines tall (sender / subject / preview), so the dot
lands a full line below the checkbox and the avatar it reads as a column
with — the taller the row, the worse it looks.

Anchor it on the first line instead: row padding + half an avatar, following
the density (and the text line height when the avatar is hidden in
extra-compact). The webmail's list carries the same `top-1/2` and the same
drift.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FTRyrFCR2N9qkpKK37GgWb

src/screens/EmailListScreen.tsx

@@ -46,6 +46,9 @@ function isPinned(email: Email): boolean {
   return !!email.keywords?.$important;
 }
 
+// Height of the sender line when the avatar is hidden (extra-compact density),
+// used to anchor the unread dot on that first line.
+const UNREAD_DOT_TEXT_LINE = 20;
 
 const EmailRow = React.memo(function EmailRow({
   item,
@@ -92,7 +95,14 @@ const EmailRow = React.memo(function EmailRow({
       onLongPress={handleLongPress}
       delayLongPress={300}
     >
-      {unread && <View style={styles.unreadDot} />}
+      {unread && (
+        <View
+          style={[
+            styles.unreadDot,
+            { top: density.rowPaddingVertical + (density.showAvatar ? componentSizes.avatarMd : UNREAD_DOT_TEXT_LINE) / 2 - 4 },
+          ]}
+        />
+      )}
       {selectionMode && (
         <View style={styles.rowCheckboxWrap}>
           {selected ? (
@@ -1369,11 +1379,12 @@ function makeStyles(c: ThemePalette) {
   // Mirrors the webmail's unread indicator: an 8px filled circle at the row's
   // start edge, vertically centered (email-list-item.tsx, fill-unread). The
   // weight/color change alone is too subtle on some device fonts (#27).
+  // `top` is set per row: the dot is anchored on the row's *first* line (top
+  // padding + half an avatar), not on the row's midpoint, which would drop it
+  // a full line below the checkbox and avatar it reads as a column with.
   unreadDot: {
     position: 'absolute',
     left: 4,
-    top: '50%',
-    marginTop: -4,
     width: 8,
     height: 8,
     borderRadius: 4,

src/screens/UnifiedInboxScreen.tsx

@@ -221,12 +221,13 @@ function makeStyles(c: ThemePalette) {
     },
     rowPressed: { backgroundColor: c.surfaceHover },
     // Same unread indicator as the mailbox list (and the webmail): an 8px
-    // filled circle in the start gutter, vertically centered (#27).
+    // filled circle in the start gutter (#27). Anchored on the row's *first*
+    // line — top padding + half an avatar — because centring it on the row
+    // drops it a full line below the avatar it reads as a column with.
     unreadDot: {
       position: 'absolute',
       left: 4,
-      top: '50%',
-      marginTop: -4,
+      top: spacing.md + componentSizes.avatarMd / 2 - 4,
       width: 8,
       height: 8,
       borderRadius: 4,