Step 186: keyboard shortcut reference

editor/src/ShortcutReference.h

@@ -0,0 +1,39 @@
+#pragma once
+
+#include "imgui.h"
+#include "EditorState.h"
+
+#include <algorithm>
+#include <string>
+
+struct ShortcutReferenceState {
+    char filter[128] = {};
+};
+
+static void renderShortcutReference(EditorState& state, ShortcutReferenceState& panel) {
+    if (!state.ui.showShortcutReference) return;
+    ImGui::Begin("Keyboard Shortcuts", &state.ui.showShortcutReference);
+    ImGui::PushFont(state.uiFont);
+    ImGui::InputText("Filter", panel.filter, sizeof(panel.filter));
+    std::string filterText = panel.filter;
+    std::transform(filterText.begin(), filterText.end(), filterText.begin(),
+                   [](unsigned char c) { return (char)std::tolower(c); });
+    ImGui::Separator();
+
+    ImGui::BeginChild("##shortcuts", ImVec2(0, 0), false);
+    auto actions = state.keys.listActions();
+    std::sort(actions.begin(), actions.end());
+    for (const auto& action : actions) {
+        std::string lower = action;
+        std::transform(lower.begin(), lower.end(), lower.begin(),
+                       [](unsigned char c) { return (char)std::tolower(c); });
+        if (!filterText.empty() && lower.find(filterText) == std::string::npos) continue;
+        KeyCombo combo = state.keys.getBinding(action);
+        ImGui::Text("%s", action.c_str());
+        ImGui::SameLine(260.0f);
+        ImGui::TextDisabled("%s", combo.toString().c_str());
+    }
+    ImGui::EndChild();
+    ImGui::PopFont();
+    ImGui::End();
+}

editor/src/main.cpp

@@ -17,6 +17,7 @@
 #include "ThemeEngine.h"
 #include "FirstRunWizard.h"
 #include "FeatureHints.h"
+#include "ShortcutReference.h"
 
 // --- Panel headers ---
 #include "panels/MenuBarPanel.h"
@@ -380,6 +381,8 @@ int main(int, char**) {
         renderFirstRunWizard(state, wizard);
         state.ui.showFirstRunWizard = wizard.open;
         renderFeatureHintBar(state.featureHints, state.workspaceRoot);
+        static ShortcutReferenceState shortcutPanel;
+        renderShortcutReference(state, shortcutPanel);
         state.notifications.renderHistoryWindow([&](const Notification& note) {
             if (note.hasTarget) state.navigateToTarget(note.target);
         });

editor/src/panels/MenuBarPanel.h

@@ -100,6 +100,7 @@ static void renderMenuBar(EditorState& state) {
         ImGui::MenuItem("Emacs Packages", nullptr, &state.emacsState.showEmacsPackagesPanel);
         ImGui::MenuItem("Emacs Bridge", nullptr, &state.emacsState.showEmacsBridgePanel);
         ImGui::MenuItem("Settings", nullptr, &state.ui.showSettingsPanel);
+        ImGui::MenuItem("Keyboard Shortcuts", nullptr, &state.ui.showShortcutReference);
         ImGui::MenuItem("LSP Servers...", nullptr, &state.ui.showLspSettings);
         if (state.active()) {
             bool textMode = state.active()->bufferMode == BufferManager::BufferMode::Text;

editor/src/state/UIFlags.h

@@ -10,6 +10,7 @@ struct UIFlags {
     bool showLspSettings = false;
     bool showSettingsPanel = false;
     bool showFirstRunWizard = false;
+    bool showShortcutReference = false;
     int bottomTab = 0; // 0=Output,1=AST,2=Highlighted
     LayoutPreset layoutPreset = LayoutPreset::VSCode;
 };