diff --git a/frontend/apps/artcraft-webapp/src/app/app.tsx b/frontend/apps/artcraft-webapp/src/app/app.tsx
index 4f0003483e..e45f81f926 100644
--- a/frontend/apps/artcraft-webapp/src/app/app.tsx
+++ b/frontend/apps/artcraft-webapp/src/app/app.tsx
@@ -90,15 +90,16 @@ function ProtectedContent() {
       ? "var(--sidebar-width)"
       : "calc(var(--sidebar-width-icon) + 1.5rem)";
 
-  // The Edit 3D and video editors host the header's actions
+  // The Edit 3D, Edit Image, and video editors host the header's actions
   // (pricing/credits/task queue/profile) inside their own toolbar/header to
   // reclaim vertical space, so the global header is hidden there — desktop
-  // only, since the mobile route shows a gate that still needs the header's
-  // nav chrome.
+  // only, since the mobile routes show the global chrome (Edit Image keeps the
+  // bar on mobile; Edit 3D shows a gate that still needs the header's nav).
   const hideTopBar =
     !isMobile &&
     (pathname === "/edit-3d" ||
       pathname.startsWith("/edit-3d/") ||
+      pathname === "/edit-image" ||
       pathname === "/video-editor" ||
       pathname.startsWith("/video-editor/"));
 
@@ -108,7 +109,14 @@ function ProtectedContent() {
       style={{ "--ac-sidebar-offset": sidebarOffset } as React.CSSProperties}
     >
       {!hideTopBar && <TopBar />}
-      <SidebarInset className="flex-1 min-h-0 overflow-y-auto bg-[#121212]">
+      {/* The immersive editors (hideTopBar routes) paint their own #101014
+          canvas backdrop; match the inset to it so no lighter strip shows at
+          the edges. Other pages keep the standard #121212 surface. */}
+      <SidebarInset
+        className={`flex-1 min-h-0 overflow-y-auto ${
+          hideTopBar ? "bg-[#101014]" : "bg-[#121212]"
+        }`}
+      >
         <Outlet />
       </SidebarInset>
       {isMobile && <MobileBottomNav />}
diff --git a/frontend/apps/artcraft-webapp/src/main.tsx b/frontend/apps/artcraft-webapp/src/main.tsx
index 72e9caa1e0..c605a64d68 100644
--- a/frontend/apps/artcraft-webapp/src/main.tsx
+++ b/frontend/apps/artcraft-webapp/src/main.tsx
@@ -19,7 +19,10 @@ if (import.meta.env.DEV) {
       window.location.origin,
     );
     // NB: This is for Brandon to test with storyteller-web locally:
-    StorytellerApiHostStore.getInstance().setDevelopment();
+    // (disabled — it overrides the origin above and points at localhost:12345,
+    // which breaks dev unless a local backend is running. Re-enable only when
+    // testing against a local storyteller-web.)
+    // StorytellerApiHostStore.getInstance().setDevelopment();
   } catch (e) {
     console.warn("Failed to set dev API host override", e);
   }
diff --git a/frontend/apps/artcraft-webapp/src/pages/pagedraw/base-image-selector.tsx b/frontend/apps/artcraft-webapp/src/pages/pagedraw/base-image-selector.tsx
index b18919e90f..10f5222d9b 100644
--- a/frontend/apps/artcraft-webapp/src/pages/pagedraw/base-image-selector.tsx
+++ b/frontend/apps/artcraft-webapp/src/pages/pagedraw/base-image-selector.tsx
@@ -148,8 +148,8 @@ export function BaseImageSelector({
         onDrop={onDrop}
         className={`flex h-full w-full cursor-pointer flex-col items-center justify-center gap-4 rounded-2xl border-2 border-dashed p-8 text-center transition-colors ${
           isDragging
-            ? "border-blue-400 bg-blue-500/10"
-            : "border-ui-panel-border bg-ui-background hover:border-blue-400/50"
+            ? "border-primary-400 bg-primary/10"
+            : "border-ui-panel-border bg-ui-background hover:border-primary-400/50"
         } ${busy ? "pointer-events-none opacity-60" : ""}`}
       >
         <input
@@ -159,7 +159,7 @@ export function BaseImageSelector({
           onChange={onFileInput}
           disabled={busy}
         />
-        <div className="flex h-14 w-14 items-center justify-center rounded-2xl border border-blue-400/30 bg-blue-500/30 text-blue-300">
+        <div className="flex h-14 w-14 items-center justify-center rounded-2xl border border-primary-400/30 bg-primary/30 text-primary-300">
           <FontAwesomeIcon
             icon={busy ? faSpinnerThird : faPencil}
             className={`text-xl ${busy ? "animate-spin" : ""}`}
diff --git a/frontend/apps/artcraft-webapp/src/pages/pagedraw/pagedraw.tsx b/frontend/apps/artcraft-webapp/src/pages/pagedraw/pagedraw.tsx
index eb9c17f92e..5adf2f4c7a 100644
--- a/frontend/apps/artcraft-webapp/src/pages/pagedraw/pagedraw.tsx
+++ b/frontend/apps/artcraft-webapp/src/pages/pagedraw/pagedraw.tsx
@@ -1,9 +1,16 @@
+import type { CSSProperties } from "react";
 import { PageDraw as PageDrawLib } from "@storyteller/ui-pagedraw";
 import Seo from "../../components/seo";
+import { useSidebar } from "../../components/ui/sidebar";
+import { TopBarActions } from "../../components/topbar/TopBarActions";
 import { useWebPageDrawAdapter } from "./web-adapter";
 
 export default function PageDraw() {
   const adapter = useWebPageDrawAdapter();
+  // The global top bar is hidden on this route (desktop) so the editor
+  // reclaims the full vertical strip — mirror Edit 3D / Video Editor. On
+  // mobile the global bar stays, so don't re-host the actions here.
+  const { isMobile } = useSidebar();
   return (
     <>
       <Seo
@@ -16,9 +23,35 @@ export default function PageDraw() {
           same technique the Edit 3D page uses for its lib overlays. */}
       <div
         className="relative h-full w-full overflow-hidden"
-        style={{ transform: "translateZ(0)" }}
+        style={
+          {
+            transform: "translateZ(0)",
+            // Recolors the lib's `.pegboard-bg` canvas backdrop (the surface
+            // behind the artboard) to the webapp's page color.
+            "--st-canvas": "#101014",
+            // With the global top bar hidden but the bottom prompt bar still
+            // present, the usable canvas area's center sits above the geometric
+            // center. Pull the side panels (toolbar + history) up by half the
+            // prompt-bar footprint so they read as centered in that area.
+            "--pd-bottom-reserve": "4rem",
+          } as CSSProperties
+        }
       >
-        <PageDrawLib adapter={adapter} />
+        <PageDrawLib
+          adapter={adapter}
+          backgroundClassName="bg-[#101014]"
+          fillParentHeight={!isMobile}
+          // Cost/help live in the webapp's own chrome, not over the canvas.
+          showBottomRightControls={false}
+        />
+        {/* With the global top bar hidden on desktop, float the same
+            credits / pricing / task-queue / profile cluster in the top-right
+            corner so those actions stay reachable while editing. */}
+        {!isMobile && (
+          <div className="pointer-events-auto fixed right-4 top-3 z-30">
+            <TopBarActions />
+          </div>
+        )}
       </div>
     </>
   );
diff --git a/frontend/apps/artcraft-webapp/src/pages/pagedraw/web-adapter.tsx b/frontend/apps/artcraft-webapp/src/pages/pagedraw/web-adapter.tsx
index ae316ce501..3ecee971c6 100644
--- a/frontend/apps/artcraft-webapp/src/pages/pagedraw/web-adapter.tsx
+++ b/frontend/apps/artcraft-webapp/src/pages/pagedraw/web-adapter.tsx
@@ -21,6 +21,7 @@ import {
   type BaseSelectorImage,
   useSceneStore,
 } from "@storyteller/ui-pagedraw";
+import { CommonAspectRatio, CommonResolution } from "@storyteller/model-list";
 import {
   OmniGenApi,
   StorytellerApiHostStore,
@@ -141,6 +142,29 @@ const uploadBlobAsImage = async (
   return mediaToken;
 };
 
+// The PromptBox UI emits resolution/aspect-ratio as display labels ("1k",
+// "wide", …); the omni-gen REST body wants the CommonResolution /
+// CommonAspectRatio enum values ("one_k", "wide", …). Mirror the desktop
+// PageDraw adapter's mappers so an unmapped "1k" doesn't 400 the request.
+const mapAspectRatio = (ratio?: string): CommonAspectRatio | undefined => {
+  switch (ratio) {
+    case "auto":   return CommonAspectRatio.Auto;
+    case "wide":   return CommonAspectRatio.Wide;
+    case "tall":   return CommonAspectRatio.Tall;
+    case "square": return CommonAspectRatio.Square;
+    default:       return undefined;
+  }
+};
+
+const mapResolution = (res?: string): CommonResolution | undefined => {
+  switch (res) {
+    case "1k": return CommonResolution.OneK;
+    case "2k": return CommonResolution.TwoK;
+    case "4k": return CommonResolution.FourK;
+    default:   return undefined;
+  }
+};
+
 // PageDrawEditRequest.model is an ImageModel object (or possibly a raw id);
 // the omni-gen REST body wants the string id.
 const modelIdOf = (model: unknown): string => {
@@ -177,8 +201,8 @@ export const useWebPageDrawAdapter = (): PageDrawAdapter => {
           model: modelIdOf(req.model),
           prompt: req.prompt ?? null,
           idempotency_token: crypto.randomUUID(),
-          aspect_ratio: req.aspectRatio ?? null,
-          resolution: req.imageResolution ?? null,
+          aspect_ratio: mapAspectRatio(req.aspectRatio) ?? null,
+          resolution: mapResolution(req.imageResolution) ?? null,
           image_batch_count: req.imageCount ?? 1,
           image_media_tokens: refTokens.length ? refTokens : null,
         };
diff --git a/frontend/libs/components/model-selector/src/lib/classy-model-selector.tsx b/frontend/libs/components/model-selector/src/lib/classy-model-selector.tsx
index dd4c35b0c8..aa87522920 100644
--- a/frontend/libs/components/model-selector/src/lib/classy-model-selector.tsx
+++ b/frontend/libs/components/model-selector/src/lib/classy-model-selector.tsx
@@ -34,6 +34,14 @@ interface ClassyModelSelectorProps {
    * provider-selection rows.
    */
   variant?: "floating" | "embedded";
+  /**
+   * Whether models that support multiple providers expose the provider-picker
+   * submenu (hover panel) and the per-row provider icon chips. Defaults to
+   * true. Pages locked to a single provider (e.g. PageDraw) pass false to show
+   * only the model name — the default provider is still resolved into the
+   * store so downstream generation calls keep working.
+   */
+  showProviderSelection?: boolean;
 }
 
 const DEFAULT_PROVIDER_OPTIONS: GenerationProvider[] = [GenerationProvider.Artcraft];
@@ -113,6 +121,7 @@ export function ClassyModelSelector({
   providerTooltipDelayMs = 300,
   maxListHeight = "60vh",
   variant = "floating",
+  showProviderSelection = true,
   ...popoverProps
 }: ClassyModelSelectorProps) {
   const { selectedModels, setSelectedModel, setSelectedProvider } =
@@ -159,7 +168,10 @@ export function ClassyModelSelector({
         const modelId = item.model?.id;
         const allowedProviders = item.model?.getProviders() || DEFAULT_PROVIDER_OPTIONS;
 
-        const hasMultipleProviders = allowedProviders.length >= 2;
+        // When provider selection is hidden, treat every model as
+        // single-provider so the submenu and provider chips never render.
+        const hasMultipleProviders =
+          showProviderSelection && allowedProviders.length >= 2;
 
         return {
           ...item,
@@ -213,6 +225,7 @@ export function ClassyModelSelector({
       page,
       providersByModel,
       providerTooltipDelayMs,
+      showProviderSelection,
     ],
   );
 
diff --git a/frontend/libs/components/pagedraw/src/lib/HistoryStack.tsx b/frontend/libs/components/pagedraw/src/lib/HistoryStack.tsx
index 856b9896f6..014ca2d00c 100644
--- a/frontend/libs/components/pagedraw/src/lib/HistoryStack.tsx
+++ b/frontend/libs/components/pagedraw/src/lib/HistoryStack.tsx
@@ -170,7 +170,7 @@ export const HistoryStack = ({
         <div className="mb-2 flex w-full items-center justify-center">
           <FontAwesomeIcon
             icon={faClockRotateLeft}
-            className="p-1 text-gray-400"
+            className="p-1 text-base-fg/50"
           />
         </div>
         <div
diff --git a/frontend/libs/components/pagedraw/src/lib/PageDraw.tsx b/frontend/libs/components/pagedraw/src/lib/PageDraw.tsx
index dab2741090..ae481401e4 100644
--- a/frontend/libs/components/pagedraw/src/lib/PageDraw.tsx
+++ b/frontend/libs/components/pagedraw/src/lib/PageDraw.tsx
@@ -154,7 +154,7 @@ const Edit3DButton = memo(function Edit3DButton({
 
   return (
     <button
-      className="pointer-events-auto fixed z-40 -translate-x-1/2 -translate-y-1/2 rounded-full bg-blue-600 px-3 py-1 text-xs font-semibold text-white shadow-lg hover:bg-blue-500"
+      className="pointer-events-auto fixed z-40 -translate-x-1/2 -translate-y-1/2 rounded-full bg-primary px-3 py-1 text-xs font-semibold text-white shadow-lg hover:bg-primary-400"
       style={{ left: btnLeft, top: btnTop }}
       onPointerDown={(e) => e.stopPropagation()}
       onClick={() => onEdit(nodeId)}
@@ -185,7 +185,7 @@ function DragScrubButton({
   return (
     <button
       title={title}
-      className="flex h-10 w-10 cursor-move items-center justify-center rounded-full bg-black/70 text-white shadow-lg hover:bg-black/90 active:bg-blue-600"
+      className="flex h-10 w-10 cursor-move items-center justify-center rounded-full bg-black/70 text-white shadow-lg hover:bg-black/90 active:bg-primary"
       onPointerDown={onPointerDown}
       onPointerMove={onPointerMove}
     >
@@ -254,7 +254,7 @@ const Edit3DScrubControls = memo(function Edit3DScrubControls({
       />
       <button
         onClick={() => overlayHandle.current?.commit()}
-        className="flex h-10 w-10 items-center justify-center rounded-full bg-blue-600 text-sm font-bold text-white shadow-lg hover:bg-blue-500"
+        className="flex h-10 w-10 items-center justify-center rounded-full bg-primary text-sm font-bold text-white shadow-lg hover:bg-primary-400"
         onPointerDown={(e) => e.stopPropagation()}
       >
         ✓
@@ -267,9 +267,32 @@ const Edit3DScrubControls = memo(function Edit3DScrubControls({
 
 interface PageDrawProps {
   adapter: PageDrawAdapter;
+  /**
+   * Tailwind class for the full-viewport canvas backdrop (and the base-image
+   * selector surface). Defaults to the app's `bg-ui-background`; hosts that
+   * embed PageDraw under their own page chrome can pass a matching color (e.g.
+   * the webapp's `bg-[#101014]`).
+   */
+  backgroundClassName?: string;
+  /**
+   * When true the base-image selector fills its parent box instead of
+   * reserving 56px for a global top bar. Hosts that hide their top bar on this
+   * route (so the editor reclaims the full vertical strip) should set this.
+   */
+  fillParentHeight?: boolean;
+  /**
+   * Show the bottom-right cost-calculator + help cluster. Defaults to true;
+   * hosts that surface those elsewhere (e.g. the webapp) pass false.
+   */
+  showBottomRightControls?: boolean;
 }
 
-const PageDraw = ({ adapter }: PageDrawProps) => {
+const PageDraw = ({
+  adapter,
+  backgroundClassName = "bg-ui-background",
+  fillParentHeight = false,
+  showBottomRightControls = true,
+}: PageDrawProps) => {
   const canvasWidth = useRef<number>(1024);
   const canvasHeight = useRef<number>(1024);
   const [isSelecting, setIsSelecting] = useState<boolean>(false);
@@ -1111,9 +1134,9 @@ const PageDraw = ({ adapter }: PageDrawProps) => {
   if (!baseImageInfo || (!baseImageBitmap && !baseImageInfo.isBlankCanvas)) {
     return (
       <div
-        className={
-          "bg-ui-panel-gradient flex h-[calc(100vh-56px)] w-full items-center justify-center p-8"
-        }
+        className={`${backgroundClassName} flex ${
+          fillParentHeight ? "h-full" : "h-[calc(100vh-56px)]"
+        } w-full items-center justify-center p-8`}
       >
         <div className="w-full max-w-5xl">
           <div className="aspect-video overflow-hidden rounded-2xl border border-ui-panel-border bg-ui-background shadow-lg">
@@ -1135,9 +1158,9 @@ const PageDraw = ({ adapter }: PageDrawProps) => {
 
   return (
     <>
-      <div className="fixed inset-0 -z-10 bg-ui-background" />
+      <div className={`fixed inset-0 -z-10 ${backgroundClassName}`} />
       <div
-        className={`preserve-aspect-ratio fixed right-4 top-1/2 z-10 -translate-y-1/2 transform ${
+        className={`preserve-aspect-ratio fixed right-4 top-[calc(50%_-_var(--pd-bottom-reserve,0px))] z-10 -translate-y-1/2 transform ${
           isSelecting ? "pointer-events-none" : "pointer-events-auto"
         }`}
       >
@@ -1167,8 +1190,12 @@ const PageDraw = ({ adapter }: PageDrawProps) => {
           selectedImageToken={baseImageInfo?.mediaToken}
         />
       </div>
+      {/* The page wrapper's `translateZ(0)` already scopes this fixed box to
+          the content area (right of the sidebar). It spans 0..right so the
+          promptbox's own `left-1/2 -translate-x-1/2` centers within the content
+          area — do NOT re-apply the sidebar offset or it double-shifts right. */}
       <div
-        className={`preserve-aspect-ratio fixed bottom-0 left-1/2 z-10 -translate-x-1/2 transform ${
+        className={`preserve-aspect-ratio fixed inset-x-0 bottom-0 z-10 ${
           isSelecting ? "pointer-events-none" : "pointer-events-auto"
         }`}
       >
@@ -1190,12 +1217,13 @@ const PageDraw = ({ adapter }: PageDrawProps) => {
               variant="embedded"
               items={CANVAS_2D_PAGE_MODEL_LIST}
               page={PAGE_ID}
+              showProviderSelection={false}
             />
           }
         />
       </div>
       <SideToolbar
-        className="fixed left-0 top-1/2 z-10 -translate-y-1/2 transform"
+        className="fixed left-0 top-[calc(50%_-_var(--pd-bottom-reserve,0px))] z-10 -translate-y-1/2 transform"
         onSelect={handleSelectTool}
         onActivateShapeTool={handleActivateShapeTool}
         onPaintBrush={handlePaintBrush}
@@ -1247,13 +1275,16 @@ const PageDraw = ({ adapter }: PageDrawProps) => {
             transformerRefs={transformerRefs}
             baseImageRef={baseImageKonvaRef}
             showMaskLayer={supportsMaskedInpainting}
+            fillParentHeight={fillParentHeight}
           />
         </ContextMenuContainer>
       </div>
-      <div className="absolute bottom-4 right-4 z-20 flex items-center gap-2">
-        <CostCalculatorButton modelPage={PAGE_ID} />
-        <HelpMenuButton />
-      </div>
+      {showBottomRightControls && (
+        <div className="absolute bottom-4 right-4 z-20 flex items-center gap-2">
+          <CostCalculatorButton modelPage={PAGE_ID} />
+          <HelpMenuButton />
+        </div>
+      )}
       {!editing3DNodeId && selectedNodeWithModel?.modelUrl && (
         <Edit3DButton
           nodeId={selectedNodeIds[0]}
diff --git a/frontend/libs/components/pagedraw/src/lib/PaintSurface.tsx b/frontend/libs/components/pagedraw/src/lib/PaintSurface.tsx
index e68d6460d8..e4a1df0322 100644
--- a/frontend/libs/components/pagedraw/src/lib/PaintSurface.tsx
+++ b/frontend/libs/components/pagedraw/src/lib/PaintSurface.tsx
@@ -50,6 +50,8 @@ export type MiraiProps = {
   transformerRefs: React.RefObject<{ [key: string]: Konva.Transformer }>;
   baseImageRef: React.RefObject<Konva.Image>;
   showMaskLayer: boolean;
+  /** Forwarded to SplitPane so the backdrop fills the parent (no 56px top-bar reserve). */
+  fillParentHeight?: boolean;
 };
 
 const InpaintingColor = "rgba(39, 187, 245, 0.54)";
@@ -74,6 +76,7 @@ export const PaintSurface = ({
   transformerRefs,
   baseImageRef,
   showMaskLayer = false,
+  fillParentHeight = false,
 }: MiraiProps) => {
   const singlePaneMode = true;
 
@@ -1616,6 +1619,7 @@ export const PaintSurface = ({
   return (
     <SplitPane
       singlePaneMode={singlePaneMode}
+      fillParentHeight={fillParentHeight}
       initialPercent={singlePaneMode ? 100 : 50}
       onChange={setLeftPct}
       left={
diff --git a/frontend/libs/components/pagedraw/src/lib/components/ui/ContextMenu.tsx b/frontend/libs/components/pagedraw/src/lib/components/ui/ContextMenu.tsx
index 0f1f141c74..cdc03d1b8b 100644
--- a/frontend/libs/components/pagedraw/src/lib/components/ui/ContextMenu.tsx
+++ b/frontend/libs/components/pagedraw/src/lib/components/ui/ContextMenu.tsx
@@ -41,7 +41,7 @@ export const ContextMenu: React.FC<ContextMenuProps> = ({ items, onAction, onClo
         left: `${position.x}px`,
         top: `${position.y}px`,
       }}
-      className="fixed z-[9999999] min-w-[220px] bg-[#1A1A1A] rounded-lg shadow-xl border border-[#333333] py-1 select-none"
+      className="fixed z-[9999999] min-w-[220px] bg-ui-panel rounded-lg shadow-xl border border-white/10 py-1 select-none"
     >
       {items.map((item, index) => (
         <React.Fragment key={index}>
@@ -50,14 +50,14 @@ export const ContextMenu: React.FC<ContextMenuProps> = ({ items, onAction, onClo
               onAction(item.action);  // Pass the action identifier up
               onClose();
             }}
-            className="w-full px-4 py-2.5 flex items-center gap-3 hover:bg-[#333333] text-[#ECECEC] text-[13px] transition-colors duration-75 ease-in-out"
+            className="w-full px-4 py-2.5 flex items-center gap-3 hover:bg-white/10 text-base-fg/90 text-[13px] transition-colors duration-75 ease-in-out"
           >
-            <span className="w-5 h-5 flex items-center justify-center text-[#ECECEC]">
+            <span className="w-5 h-5 flex items-center justify-center text-base-fg/90">
               {item.icon}
             </span>
             <span className="font-normal">{item.label}</span>
           </button>
-          {item.divider && <div className="h-[1px] bg-[#333333] mx-2 my-1" />}
+          {item.divider && <div className="h-[1px] bg-white/10 mx-2 my-1" />}
         </React.Fragment>
       ))}
     </div>,
diff --git a/frontend/libs/components/pagedraw/src/lib/components/ui/SideToolbar.tsx b/frontend/libs/components/pagedraw/src/lib/components/ui/SideToolbar.tsx
index da59324a0f..4cbe2fad03 100644
--- a/frontend/libs/components/pagedraw/src/lib/components/ui/SideToolbar.tsx
+++ b/frontend/libs/components/pagedraw/src/lib/components/ui/SideToolbar.tsx
@@ -169,7 +169,7 @@ const SideToolbar: React.FC<SideToolbarProps> = ({
     extra?: React.ReactNode,
   ) => (
     <div className={`glass relative w-fit rounded-2xl p-4 shadow-lg`}>
-      <button className="bg-zinc-700 text-zinc-300 hover:bg-zinc-600 absolute left-4 top-4 flex h-8 w-8 items-center justify-center rounded-full">
+      <button className="bg-ui-controls/60 text-base-fg hover:bg-ui-controls/80 absolute left-4 top-4 flex h-8 w-8 items-center justify-center rounded-full">
         <FontAwesomeIcon icon={faEyeDropper} size="sm" />
       </button>
 
@@ -377,7 +377,7 @@ const SideToolbar: React.FC<SideToolbarProps> = ({
             {open === "shape-color" && (
               <div
                 onMouseLeave={() => setOpen(null)}
-                className="absolute left-14 top-1/2 -translate-y-1/2 rounded-xl border border-[#404040] bg-[#303030] transition-all duration-200 ease-in-out"
+                className="absolute left-14 top-1/2 -translate-y-1/2 rounded-xl border border-white/10 bg-ui-panel transition-all duration-200 ease-in-out"
               >
                 {ShapePopout}
               </div>
@@ -546,7 +546,7 @@ const SideToolbar: React.FC<SideToolbarProps> = ({
                 onMouseLeave={() => {
                   setOpen(null);
                 }}
-                className="absolute left-14 top-1/2 -translate-y-1/2 rounded-xl border border-[#404040] bg-[#303030] transition-all duration-200 ease-in-out"
+                className="absolute left-14 top-1/2 -translate-y-1/2 rounded-xl border border-white/10 bg-ui-panel transition-all duration-200 ease-in-out"
               >
                 {popout}
               </div>
diff --git a/frontend/libs/components/pagedraw/src/lib/components/ui/SliderWithIndicator.tsx b/frontend/libs/components/pagedraw/src/lib/components/ui/SliderWithIndicator.tsx
index 07d41602d4..37ab63ad83 100644
--- a/frontend/libs/components/pagedraw/src/lib/components/ui/SliderWithIndicator.tsx
+++ b/frontend/libs/components/pagedraw/src/lib/components/ui/SliderWithIndicator.tsx
@@ -58,7 +58,7 @@ const SliderWithIndicator: React.FC<SliderWithIndicatorProps> = ({
               absolute
               top-6 -translate-x-1/2
               transform rounded
-              bg-[#5F5F68]
+              bg-ui-controls
               px-2 py-1
               text-xs font-medium
               text-white shadow-lg
diff --git a/frontend/libs/components/pagedraw/src/lib/components/ui/SplitPane.tsx b/frontend/libs/components/pagedraw/src/lib/components/ui/SplitPane.tsx
index d8a5a8f938..900effdd97 100644
--- a/frontend/libs/components/pagedraw/src/lib/components/ui/SplitPane.tsx
+++ b/frontend/libs/components/pagedraw/src/lib/components/ui/SplitPane.tsx
@@ -16,6 +16,12 @@ export type SplitPaneProps = {
   /** Extra classes for the outer wrapper */
   className?: string;
   singlePaneMode: boolean;
+  /**
+   * Fill the parent box instead of reserving 56px for a global top bar. Hosts
+   * that hide their top bar on this route pass true so the backdrop reaches
+   * every edge.
+   */
+  fillParentHeight?: boolean;
 };
 
 export default function SplitPane({
@@ -27,7 +33,9 @@ export default function SplitPane({
   onChange,
   className = "",
   singlePaneMode = true,
+  fillParentHeight = false,
 }: SplitPaneProps) {
+  const heightClass = fillParentHeight ? "h-full" : "h-[calc(100vh-56px)]";
   const rootRef = useRef<HTMLDivElement>(null);
   const [leftPct, setLeftPct] = useState(initialPercent);
 
@@ -65,7 +73,7 @@ export default function SplitPane({
   return singlePaneMode ? (
     <div
       ref={rootRef}
-      className={`pegboard-bg relative flex h-[calc(100vh-56px)] w-full items-center justify-center overflow-hidden ${className}`}
+      className={`pegboard-bg relative flex ${heightClass} w-full items-center justify-center overflow-hidden ${className}`}
     >
       <div style={leftStyle} className="h-full min-w-0 overflow-hidden">
         {left}
@@ -74,15 +82,15 @@ export default function SplitPane({
   ) : (
     <div
       ref={rootRef}
-      className={`pegboard-bg relative flex h-[calc(100vh-56px)] w-full overflow-hidden ${className}`}
+      className={`pegboard-bg relative flex ${heightClass} w-full overflow-hidden ${className}`}
     >
       <div style={leftStyle} className="h-full min-w-0 overflow-hidden">
         {left}
       </div>
 
       <div
-        className="w-1 cursor-col-resize select-none bg-gray-500/80
-                   transition hover:bg-gray-600"
+        className="w-1 cursor-col-resize select-none bg-white/20
+                   transition hover:bg-white/30"
         onMouseDown={beginDrag}
         onTouchStart={beginDrag}
       />
diff --git a/frontend/libs/components/pagedraw/src/lib/pagedraw.css b/frontend/libs/components/pagedraw/src/lib/pagedraw.css
index e6002b3ec2..2740dbe11f 100644
--- a/frontend/libs/components/pagedraw/src/lib/pagedraw.css
+++ b/frontend/libs/components/pagedraw/src/lib/pagedraw.css
@@ -3,7 +3,9 @@
 .pegboard-bg {
   inset: 0;
   z-index: 0;
-  background-color: #1b1b1b;
+  /* Themeable canvas backdrop; hosts may set --st-canvas, otherwise the
+     original dark grey is used. */
+  background-color: var(--st-canvas, #101014);
   background-size: 50px 50px;
   background-position:
     0 0,
diff --git a/frontend/libs/components/promptbox/src/lib/PromptBox2D.tsx b/frontend/libs/components/promptbox/src/lib/PromptBox2D.tsx
index 4142da259e..1c66983548 100644
--- a/frontend/libs/components/promptbox/src/lib/PromptBox2D.tsx
+++ b/frontend/libs/components/promptbox/src/lib/PromptBox2D.tsx
@@ -358,7 +358,7 @@ export const PromptBox2D = ({
       >
         {content}
       </Modal>
-      <div className="absolute bottom-4 left-1/2 flex -translate-x-1/2 flex-col gap-3">
+      <div className="absolute bottom-4 left-1/2 flex w-[90vw] max-w-5xl -translate-x-1/2 flex-col gap-3">
         {selectedImageModel?.canUseImagePrompt && isImageRowVisible && (
           <ImagePromptRow
             visible={true}
@@ -384,7 +384,7 @@ export const PromptBox2D = ({
         )}
         <div
           className={twMerge(
-            "glass relative w-[860px] rounded-2xl p-4",
+            "glass relative w-full rounded-2xl p-4",
             selectedImageModel?.canUseImagePrompt &&
               isImageRowVisible &&
               "rounded-t-none",
diff --git a/frontend/libs/components/promptbox/src/lib/PromptBox3D.tsx b/frontend/libs/components/promptbox/src/lib/PromptBox3D.tsx
index d21930a0d8..a0fe8a540f 100644
--- a/frontend/libs/components/promptbox/src/lib/PromptBox3D.tsx
+++ b/frontend/libs/components/promptbox/src/lib/PromptBox3D.tsx
@@ -606,7 +606,7 @@ export const PromptBox3D = ({
       >
         {content}
       </Modal>
-      <div className="absolute bottom-4 left-1/2 flex -translate-x-1/2 flex-col gap-3">
+      <div className="absolute bottom-4 left-1/2 flex w-[90vw] max-w-5xl -translate-x-1/2 flex-col gap-3">
         {aboveStackSlot}
         {selectedImageModel?.canUseImagePrompt && isImageRowVisible && (
           <ImagePromptRow
@@ -633,7 +633,7 @@ export const PromptBox3D = ({
         )}
         <div
           className={twMerge(
-            "glass relative w-[860px] rounded-2xl p-4",
+            "glass relative w-full rounded-2xl p-4",
             isPromptBoxFocused ? "!border !border-primary" : "",
             selectedImageModel?.canUseImagePrompt &&
               isImageRowVisible &&