sweep ClideTappable across 15 files, remove 267 lines

23 StatefulWidget+State hover pairs converted to StatelessWidget
using ClideTappable(builder: (ctx, hovered, _) => ...). Covers
app.dart (5), welcome (2), claude session host (2), column hat (2),
spine (1), pane chrome (1), tab bar (1), decisions (1), tickets (1),
graph (1), pql panel (1), backlinks (1), file tree (2), git panel (1),
git status (1). Only EditorDragHandle and ClidePalette excluded
(drag/keyboard behavior beyond hover+tap).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lib/builtin/graph/src/graph_view.dart

@@ -90,30 +90,21 @@ class _GraphNode {
       );
 }
 
-class _NodeRow extends StatefulWidget {
+class _NodeRow extends StatelessWidget {
   const _NodeRow({required this.node, required this.tokens});
   final _GraphNode node;
   final SurfaceTokens tokens;
 
-  @override
-  State<_NodeRow> createState() => _NodeRowState();
-}
-
-class _NodeRowState extends State<_NodeRow> {
-  bool _hovered = false;
-
   @override
   Widget build(BuildContext context) {
-    return MouseRegion(
-      onEnter: (_) => setState(() => _hovered = true),
-      onExit: (_) => setState(() => _hovered = false),
-      child: Container(
-        color: _hovered ? widget.tokens.listItemHoverBackground : null,
+    return ClideTappable(
+      builder: (context, hovered, _) => Container(
+        color: hovered ? tokens.listItemHoverBackground : null,
         padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 4),
         child: Row(
           children: [
-            Expanded(child: ClideText(widget.node.path, fontSize: 13)),
-            ClideText('${widget.node.inbound}in ${widget.node.outbound}out', color: widget.tokens.globalTextMuted, fontSize: 11),
+            Expanded(child: ClideText(node.path, fontSize: 13)),
+            ClideText('${node.inbound}in ${node.outbound}out', color: tokens.globalTextMuted, fontSize: 11),
           ],
         ),
       ),