Improve Windows accessibility and input parity

graphcode-windows/src/App.zig

@@ -15,6 +15,7 @@ const InputRouter = @import("InputRouter.zig");
 const MainWindow = @import("MainWindow.zig");
 const TerminalWorkspace = @import("TerminalWorkspace.zig");
 const Tokens = @import("DesignTokens.zig");
+const Dpi = @import("Dpi.zig");
 const Wire = @import("Wire.zig");
 const WorktreeStatus = @import("WorktreeStatus.zig");
 const TrayModule = @import("Tray.zig");
@@ -191,6 +192,7 @@ pub const App = struct {
     workspace: ?*TerminalWorkspace.Workspace = null,
     navigation_cursor: Navigation.Cursor = .{},
     workspace_controls: WorkspaceControls.State = .{ .panel_visible = false },
+    dpi: u32 = Dpi.base_dpi,
     surface: GraphCanvas.Surface = .project,
     canvas_layout_store: ?CanvasLayoutStore.Store = null,
     quick_chats_requested: bool = false,
@@ -4034,6 +4036,29 @@ fn onWindowMessage(
             result.* = 0;
             return true;
         },
+        c.WM_DPICHANGED => {
+            const dpi = @as(u32, @intCast(wparam & 0xffff));
+            app.dpi = Dpi.normalize(dpi);
+            if (lparam != 0) {
+                const suggested: *const c.RECT = @ptrFromInt(@as(usize, @bitCast(lparam)));
+                _ = c.SetWindowPos(
+                    hwnd,
+                    null,
+                    suggested.left,
+                    suggested.top,
+                    suggested.right - suggested.left,
+                    suggested.bottom - suggested.top,
+                    c.SWP_NOZORDER | c.SWP_NOACTIVATE,
+                );
+            }
+            app.layoutWorkspace();
+            app.clampSidebarScroll();
+            app.layoutEmptyStateControls();
+            app.syncAccessibility();
+            _ = c.InvalidateRect(hwnd, null, 0);
+            result.* = 0;
+            return true;
+        },
         c.WM_TIMER => if (wparam == MainWindow.timer_id) {
             app.smoke_tick += 1;
             if (!app.tray.added and app.smoke_tick % 10 == 0) {

graphcode-windows/src/Dpi.zig

@@ -0,0 +1,37 @@
+const std = @import("std");
+
+pub const base_dpi: u32 = 96;
+
+pub fn normalize(dpi: u32) u32 {
+    return if (dpi == 0) base_dpi else dpi;
+}
+
+pub fn scale(value: i32, dpi: u32) i32 {
+    const normalized = normalize(dpi);
+    const scaled = @divTrunc(
+        @as(i64, value) * @as(i64, normalized) + @as(i64, base_dpi / 2),
+        @as(i64, base_dpi),
+    );
+    return @intCast(scaled);
+}
+
+pub fn unscale(value: i32, dpi: u32) i32 {
+    const normalized = normalize(dpi);
+    const scaled = @divTrunc(
+        @as(i64, value) * @as(i64, base_dpi) + @as(i64, normalized / 2),
+        @as(i64, normalized),
+    );
+    return @intCast(scaled);
+}
+
+test "DPI scaling rounds at the native boundary" {
+    try std.testing.expectEqual(@as(i32, 100), scale(100, 96));
+    try std.testing.expectEqual(@as(i32, 125), scale(100, 120));
+    try std.testing.expectEqual(@as(i32, 150), scale(100, 144));
+    try std.testing.expectEqual(@as(i32, 100), unscale(125, 120));
+}
+
+test "zero DPI falls back to the Windows base DPI" {
+    try std.testing.expectEqual(base_dpi, normalize(0));
+    try std.testing.expectEqual(@as(i32, 42), scale(42, 0));
+}

graphcode-windows/src/GraphContextMenu.zig

@@ -128,7 +128,7 @@ pub fn show(
         .quick_chats => append(menu, ids.new_quick_chat, "New Chat"),
         .project => |project| {
             append(menu, ids.open_project, "Open Project");
-            append(menu, ids.new_project_loop, "New Loop...");
+            append(menu, ids.new_project_loop, "New Loop...\tCtrl+N");
             separator(menu);
             append(menu, ids.inspect_project_worktrees, "Worktrees...");
             append(menu, ids.project_settings, "Project Settings...");
@@ -146,7 +146,7 @@ pub fn show(
             append(menu, ids.delete_project_loops, "Delete All Loops...");
         },
         .node => |node| {
-            append(menu, ids.open_terminal, "Open Terminal");
+            append(menu, ids.open_terminal, "Open Terminal\tEnter");
             if (node.unwired) {
                 append(menu, ids.wire_node, "Wire it up");
                 append(menu, ids.mark_entry, "Mark as entry");
@@ -158,19 +158,19 @@ pub fn show(
                 appendEnabled(menu, ids.arm_composite, "Arm Schedule", node.can_arm);
                 separator(menu);
             }
-            append(menu, ids.edit_node, "Edit Details...");
-            append(menu, ids.rename_node, "Rename...");
-            append(menu, ids.stop_node, "Stop");
-            append(menu, ids.delete_node, "Delete Loop...");
+            append(menu, ids.edit_node, "Edit Details...\tCtrl+E");
+            append(menu, ids.rename_node, "Rename...\tF2");
+            append(menu, ids.stop_node, "Stop\tCtrl+S");
+            append(menu, ids.delete_node, "Delete Loop...\tDelete");
         },
         .edge => {
             append(menu, ids.edit_edge, "Edit Edge...");
             append(menu, ids.delete_edge, "Delete Edge");
         },
         .quick_chat => {
             append(menu, ids.open_quick_chat, "Open Chat");
-            append(menu, ids.rename_quick_chat, "Rename...");
-            append(menu, ids.delete_quick_chat, "Delete Chat...");
+            append(menu, ids.rename_quick_chat, "Rename...\tCtrl+Shift+Q");
+            append(menu, ids.delete_quick_chat, "Delete Chat...\tCtrl+Shift+Delete");
         },
     }
     const command = c.TrackPopupMenu(