give the status-bar context slot a flexible share

StatusbarHost laid every item at intrinsic width, so once the focused-pane
context line grew long (a model/mode/context/skills summary) the row's
content exceeded the bar width and overflowed instead of letting the slot
shrink. Add an opt-in flex factor to StatusItemContribution; the host wraps
flex>0 items in Flexible(loose) so they yield width when the bar is tight,
and the marquee then receives a bounded viewport and scrolls. Drops the
fixed maxWidth cap on the pane-context item.

T-160.

Co-Authored-By: Claude <noreply@anthropic.com>

lib/app.dart

@@ -1140,10 +1140,16 @@ class StatusbarHost extends StatelessWidget {
           color: tokens.chromeBackground,
           padding: const EdgeInsets.symmetric(horizontal: 8),
           alignment: Alignment.center,
+          // Left items with flex > 0 are wrapped in Flexible(loose) so they
+          // yield width when the bar is tight; their contained ClideMarquee
+          // then scrolls within the allotted bounds (T-160). Items with
+          // flex == 0 (default) stay at intrinsic width. Right-side items
+          // (priority >= 100) are always intrinsic-width.
           child: Row(
             crossAxisAlignment: CrossAxisAlignment.center,
             children: [
-              for (final item in left) item.build(ctx),
+              for (final item in left)
+                if (item.flex > 0) Flexible(flex: item.flex, fit: FlexFit.loose, child: item.build(ctx)) else item.build(ctx),
               const Spacer(),
               for (final item in right) item.build(ctx),
             ],

lib/builtin/claude/src/pane_context_status.dart

@@ -11,9 +11,6 @@ import 'package:clide/kernel/kernel.dart';
 import 'package:clide/widgets/widgets.dart';
 import 'package:flutter/widgets.dart';
 
-/// Max width the slot occupies in the status bar before marquee kicks in.
-const double _slotMaxWidth = 360;
-
 /// Fixed slot height — panes can render anything, but not blow up the bar.
 const double _slotHeight = 16;
 
@@ -28,14 +25,15 @@ class PaneContextStatusItem extends StatelessWidget {
       builder: (ctx, _) {
         final widget = focus.activeStatusWidget;
         if (widget == null) return const SizedBox.shrink();
+        // The parent StatusbarHost wraps this item in Flexible(loose) so the
+        // Row hands us a bounded maxWidth (T-160). ClideMarquee receives that
+        // constraint via LayoutBuilder and scrolls when content exceeds it —
+        // no ConstrainedBox(maxWidth) cap needed here.
         return Padding(
           padding: const EdgeInsets.symmetric(horizontal: 8),
           child: SizedBox(
             height: _slotHeight,
-            child: ConstrainedBox(
-              constraints: const BoxConstraints(maxWidth: _slotMaxWidth),
-              child: ClideMarquee(child: widget),
-            ),
+            child: ClideMarquee(child: widget),
           ),
         );
       },

lib/extension/src/contribution.dart

@@ -61,6 +61,7 @@ class StatusItemContribution extends ContributionPoint {
     required this.build,
     this.priority = 0,
     this.listenable,
+    this.flex = 0,
   });
 
   @override
@@ -68,6 +69,13 @@ class StatusItemContribution extends ContributionPoint {
   final WidgetBuilder build;
   final int priority;
   final Listenable? listenable;
+
+  /// When > 0, the status bar wraps this item in
+  /// `Flexible(flex: flex, fit: FlexFit.loose)` so it yields width when the
+  /// bar is tight and any contained [ClideMarquee] can scroll (T-160).
+  /// Defaults to 0 (intrinsic/non-flex). Only meaningful for left-side items
+  /// (priority < 100); right-side items are always intrinsic-width.
+  final int flex;
 }
 
 /// A button in the main toolbar.