group consecutive same-file edits into one collapsed card (T-296)

A run of 2+ consecutive edits to the same file now folds into one ClideHolderCard
labelled '# edits' (coalesceEditRuns, run after groupConversation) instead of a
stack of cards; a different file or an interleaving step splits the run. Every
edit stays reachable on expand.

The holder gained an optional aggregate status. New owned primitives: ClideSpinner
(the logo mark, monochrome, 3D Y-axis rotation, reduced-motion-aware) and
ClideStatusIndicator (running→spinner / success→check / error→cross, with an
AnimatedSwitcher seam for a richer transition later — kept self-contained, not
built on ConversationCard's mark). The activity card shares the same indicator.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lib/widgets/src/clide_status_indicator.dart

@@ -0,0 +1,43 @@
+/// A self-contained run-status glyph: spinner while running, check on success,
+/// cross on failure (T-296).
+///
+/// Deliberately NOT built on ConversationCard's success/error mark — it owns its
+/// own states and rendering so the spinner→check / spinner→cross transition can
+/// grow richer (a morph/cross-fade) without being constrained by that card. A
+/// light [AnimatedSwitcher] cross-fade between states is wired now; the keyed
+/// children leave the seam for a fuller transition later.
+library;
+
+import 'package:clide/kernel/src/theme/controller.dart';
+import 'package:clide/widgets/src/clide_icon.dart';
+import 'package:clide/widgets/src/clide_spinner.dart';
+import 'package:clide/widgets/src/icons/check.dart';
+import 'package:clide/widgets/src/icons/x.dart';
+import 'package:flutter/widgets.dart';
+
+enum ClideRunStatus { running, success, error }
+
+class ClideStatusIndicator extends StatelessWidget {
+  const ClideStatusIndicator({super.key, required this.status, this.size = 14});
+
+  final ClideRunStatus status;
+  final double size;
+
+  @override
+  Widget build(BuildContext context) {
+    final tokens = ClideTheme.of(context).surface;
+    final (Widget glyph, String label) = switch (status) {
+      ClideRunStatus.running => (ClideSpinner(size: size, color: tokens.globalTextMuted, key: const ValueKey('running')), 'running'),
+      ClideRunStatus.success => (ClideIcon(const CheckIcon(), size: size, color: tokens.statusSuccess, key: const ValueKey('success')), 'succeeded'),
+      ClideRunStatus.error => (ClideIcon(const CloseIcon(), size: size, color: tokens.statusError, key: const ValueKey('error')), 'failed'),
+    };
+    return Semantics(
+      label: label,
+      container: true,
+      child: AnimatedSwitcher(
+        duration: const Duration(milliseconds: 200),
+        child: glyph,
+      ),
+    );
+  }
+}