feat(debugger): Browse the debug console history and open diff settings from the keyboard (#162)

- Debug console: typed expressions are kept per project, and Browse Console
  History (⌥⌘E / Ctrl+Alt+E) lists them, most recent first, to put one back
  into the input.
- Diff viewer: Diff Settings (⇧⌘D / Ctrl+Shift+D) opens the viewer options
  (side-by-side / unified, whitespace, highlighting, collapsing, scroll sync)
  as a popup menu.

src/features/debugger/actions.ts

@@ -4,7 +4,7 @@ import { call, commands, isCancelled, isTauri, nextRequestId, type RunConfig, ty
 import { downloadJdkActions } from "@/platform/jdk";
 import { useProject } from "@/platform/project";
 import { activeEditor } from "@/editor/api";
-import { maybeEditorService, notifications, toolWindowService } from "@/workbench/contributions";
+import { maybeEditorService, notifications, showStatusInfo, toolWindowService } from "@/workbench/contributions";
 import { canPlaceBreakpoint } from "./breakpoints/languages";
 import {
   removeAllBreakpoints,
@@ -35,6 +35,7 @@ import {
   type DebugSession,
 } from "./state";
 import { focusedDebugView } from "./ui/focusedView";
+import { browseFocusedConsoleHistory } from "./ui/expressionHistory";
 import { expressionAt, valueHint } from "./editor/valueTooltip";
 import { showHint } from "@/editor/lsp/hint";
 import { pausedLineTargets, startInlineSmartStep } from "./editor/smartStep";
@@ -610,6 +611,16 @@ export function registerDebugActions(): () => void {
       when: "debugSessionActive",
       run: () => openEvaluateDialog(evaluateSeed()),
     },
+    {
+      id: "debug.browseConsoleHistory",
+      title: "Browse Console History",
+      category: "Debug",
+      keywords: ["history", "previous expressions", "repl"],
+      when: "debugSessionActive",
+      run: () => {
+        if (!browseFocusedConsoleHistory()) showStatusInfo(tx("Focus the debug console input first"));
+      },
+    },
     {
       // ⌥⌘F8: the selection (or expression at the caret) evaluated in a value hint, no dialog.
       id: "debug.quickEvaluate",