fix(ui): enable task detail text selection and compact extension stats (#1511)

ui/flutter/lib/core/utils/compact_count_formatter.dart

@@ -0,0 +1,23 @@
+abstract final class CompactCountFormatter {
+  // Counts start compacting at ten thousand by product convention, then use
+  // progressively larger decimal units so the rendered label stays bounded.
+  static const _units = [
+    (divisor: 1000000000000000000, suffix: 'qi'),
+    (divisor: 1000000000000000, suffix: 'q'),
+    (divisor: 1000000000000, suffix: 't'),
+    (divisor: 1000000000, suffix: 'b'),
+    (divisor: 1000000, suffix: 'm'),
+    (divisor: 10000, suffix: 'w'),
+  ];
+
+  static String format(int count) {
+    if (count <= 0) return '0';
+    if (count < _units.last.divisor) return count.toString();
+
+    final unit = _units.firstWhere((unit) => count >= unit.divisor);
+    final whole = count ~/ unit.divisor;
+    final tenth = (count % unit.divisor) ~/ (unit.divisor ~/ 10);
+    final value = whole < 10 && tenth > 0 ? '$whole.$tenth' : '$whole';
+    return '$value${unit.suffix}';
+  }
+}