refactor(tool): draw patch hunks without DiffView

packages/noir/tool/mcp_inspector/lib/src/model/inspector_controller.dart

@@ -120,9 +120,6 @@ final class InspectorController extends ChangeNotifier {
   /// The capability names the server advertised.
   Set<String> get capabilities => session.capabilities;
 
-  /// The server's usage instructions, when it supplies them.
-  String? get instructions => session.instructions;
-
   /// Why the session failed, when it did.
   String? get errorMessage => _errorMessage;
 

packages/noir/tool/mcp_inspector/lib/src/session/live_mcp_session.dart

@@ -97,9 +97,6 @@ final class LiveMcpSession implements McpSession {
   @override
   String? get protocolVersion => _client?.getProtocolVersion();
 
-  @override
-  String? get instructions => _client?.getInstructions();
-
   @override
   Set<String> get capabilities {
     final advertised = _client?.getServerCapabilities();

packages/noir/tool/mcp_inspector/lib/src/session/mcp_session.dart

@@ -546,9 +546,6 @@ abstract interface class McpSession {
   /// The capability names the server advertised, such as `tools`.
   Set<String> get capabilities;
 
-  /// The server's usage instructions, when it supplies them.
-  String? get instructions;
-
   /// Every JSON-RPC message this session carries.
   Stream<ProtocolEntry> get protocol;
 

packages/noir/tool/mcp_inspector/test/fake_mcp_session.dart

@@ -74,9 +74,6 @@ final class FakeMcpSession implements McpSession {
   @override
   String? get protocolVersion => _connected ? '2026-07-28' : null;
 
-  @override
-  String? get instructions => _connected ? 'Fake instructions.' : null;
-
   @override
   Set<String> get capabilities =>
       _connected ? const <String>{'tools', 'resources', 'prompts'} : const {};

packages/noir/tool/patch_manager/display_models.dart

@@ -18,7 +18,7 @@ enum PatchLayoutMode {
   bool get isMedium => this == PatchLayoutMode.medium;
 }
 
-enum PatchActionKind { skip, stage, refresh, staged }
+enum PatchActionKind { skip, stage, staged }
 
 class PatchActionItem {
   const PatchActionItem({
@@ -105,7 +105,7 @@ class PatchActionSet {
             color: PatchTheme.cyan,
           ),
           const PatchActionItem(
-            kind: PatchActionKind.refresh,
+            kind: PatchActionKind.staged,
             label: 'failed',
             selected: true,
             enabled: false,
@@ -258,10 +258,6 @@ class PatchFileRowModel {
       additionCount = null;
       deletionCount = null;
       fallbackMetadata = compact ? 'binary' : 'binary file';
-    } else if (!file.canStageContent && !file.canStageWholeFile) {
-      additionCount = null;
-      deletionCount = null;
-      fallbackMetadata = compact ? 'preview' : 'preview only';
     } else {
       additionCount = file.additionCount;
       deletionCount = file.deletionCount;
@@ -283,8 +279,6 @@ class PatchFileRowModel {
   /// Short basename of the file, already truncated to fit the current layout.
   final String basename;
 
-  /// Single-letter file-status glyph (M/A/D/R/B/!/U/S/K) — derived from both
-  /// the diff status and the review status.
   final String fileStatusLetter;
 
   /// One-cell file-kind glyph shown before the basename.

packages/noir/tool/patch_manager/patch_manager_app.dart

@@ -6,7 +6,6 @@ import 'dart:math' as math;
 import 'package:meta/meta.dart';
 import 'package:noir/noir.dart'
     hide DiffFile, DiffHunk, DiffLine, UnifiedDiffParser;
-import 'package:noir/noir.dart' as noir_diff;
 import 'package:noir/noir_low_level.dart';
 import 'display_models.dart';
 import 'git_path.dart';
@@ -171,7 +170,6 @@ class _PatchManagerViewState extends State<PatchManagerView> {
   final _diffFocus = FocusNode();
   late final List<FocusNode> _focusRing;
   late ScrollController _diffScroll;
-  final _diffViewController = noir_diff.DiffViewController();
   String? _diffScrollTarget;
   int _diffAnchorGeneration = 0;
   late String _status;
@@ -223,7 +221,6 @@ class _PatchManagerViewState extends State<PatchManagerView> {
         ..dispose();
     }
     _diffScroll.dispose();
-    _diffViewController.dispose();
     super.dispose();
   }
 
@@ -336,12 +333,7 @@ class _PatchManagerViewState extends State<PatchManagerView> {
             !_controller.hasFiles) {
           return;
         }
-        final file = _controller.currentFile;
-        if (file.canStageContent) {
-          _diffViewController.jumpToHunk(_controller.selectedHunkIndex);
-          // Patch Manager rows are variable-height cards. DiffView establishes
-          // the semantic hunk anchor; this correction retains the selected
-          // line/card offset used by the review workflow.
+        if (_controller.currentFile.canStageContent) {
           _diffScroll.jumpTo(_selectedSectionScrollOffset().toDouble());
         }
       }),
@@ -679,13 +671,11 @@ class _PatchManagerViewState extends State<PatchManagerView> {
               controller: _controller,
               focusNode: _diffFocus,
               scrollController: _diffScroll,
-              diffViewController: _diffViewController,
               stagingEnabled: !_refreshRequired,
               onSkipHunk: _skipHunk,
               onStageHunk: _stageHunk,
               onSkipWholeFile: (_) => _skipCurrentReviewTarget(),
               onStageWholeFile: _stageWholeFile,
-              onRefresh: _refresh,
             ),
           ),
         ),