feat: add PageFrame system for custom page layouts

quartz/components/frames/DefaultFrame.tsx

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+import { PageFrame, PageFrameProps } from "./types"
+import HeaderConstructor from "../Header"
+
+const Header = HeaderConstructor()
+
+/**
+ * The default page frame — three-column layout with left sidebar, center
+ * content (header + body + afterBody), and right sidebar, followed by a footer.
+ *
+ * This is the original Quartz layout, extracted from renderPage.tsx.
+ */
+export const DefaultFrame: PageFrame = {
+  name: "default",
+  render({
+    componentData,
+    header,
+    beforeBody,
+    pageBody: Content,
+    afterBody,
+    left,
+    right,
+    footer: Footer,
+  }: PageFrameProps) {
+    return (
+      <>
+        <div class="left sidebar">
+          {left.map((BodyComponent) => (
+            <BodyComponent {...componentData} />
+          ))}
+        </div>
+        <div class="center">
+          <div class="page-header">
+            <Header {...componentData}>
+              {header.map((HeaderComponent) => (
+                <HeaderComponent {...componentData} />
+              ))}
+            </Header>
+            <div class="popover-hint">
+              {beforeBody.map((BodyComponent) => (
+                <BodyComponent {...componentData} />
+              ))}
+            </div>
+          </div>
+          <Content {...componentData} />
+          <hr />
+          <div class="page-footer">
+            {afterBody.map((BodyComponent) => (
+              <BodyComponent {...componentData} />
+            ))}
+          </div>
+        </div>
+        <div class="right sidebar">
+          {right.map((BodyComponent) => (
+            <BodyComponent {...componentData} />
+          ))}
+        </div>
+        <Footer {...componentData} />
+      </>
+    )
+  },
+}

quartz/components/frames/FullWidthFrame.tsx

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+import { PageFrame, PageFrameProps } from "./types"
+import HeaderConstructor from "../Header"
+
+const Header = HeaderConstructor()
+
+/**
+ * Full-width page frame — no sidebars. The center content area spans the
+ * full width of the page. Header, beforeBody, body, afterBody, and footer
+ * are all rendered in a single column.
+ *
+ * Useful for page types like Canvas, presentations, or dashboards that
+ * need maximum horizontal space.
+ */
+export const FullWidthFrame: PageFrame = {
+  name: "full-width",
+  render({
+    componentData,
+    header,
+    beforeBody,
+    pageBody: Content,
+    afterBody,
+    footer: Footer,
+  }: PageFrameProps) {
+    return (
+      <>
+        <div class="center full-width">
+          <div class="page-header">
+            <Header {...componentData}>
+              {header.map((HeaderComponent) => (
+                <HeaderComponent {...componentData} />
+              ))}
+            </Header>
+            <div class="popover-hint">
+              {beforeBody.map((BodyComponent) => (
+                <BodyComponent {...componentData} />
+              ))}
+            </div>
+          </div>
+          <Content {...componentData} />
+          <hr />
+          <div class="page-footer">
+            {afterBody.map((BodyComponent) => (
+              <BodyComponent {...componentData} />
+            ))}
+          </div>
+        </div>
+        <Footer {...componentData} />
+      </>
+    )
+  },
+}

quartz/components/frames/MinimalFrame.tsx

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+import { PageFrame, PageFrameProps } from "./types"
+
+/**
+ * Minimal page frame — no sidebars, no header/footer chrome. Only the
+ * page body is rendered with a thin wrapper, plus the footer for legal/link
+ * obligations.
+ *
+ * Useful for immersive page types like full-screen canvases, kiosks,
+ * or custom landing pages that want complete control of the viewport.
+ */
+export const MinimalFrame: PageFrame = {
+  name: "minimal",
+  render({ componentData, pageBody: Content, footer: Footer }: PageFrameProps) {
+    return (
+      <>
+        <div class="center minimal">
+          <Content {...componentData} />
+        </div>
+        <Footer {...componentData} />
+      </>
+    )
+  },
+}

quartz/components/frames/index.ts

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+import { PageFrame } from "./types"
+import { DefaultFrame } from "./DefaultFrame"
+import { FullWidthFrame } from "./FullWidthFrame"
+import { MinimalFrame } from "./MinimalFrame"
+
+export type { PageFrame, PageFrameProps } from "./types"
+export { DefaultFrame } from "./DefaultFrame"
+export { FullWidthFrame } from "./FullWidthFrame"
+export { MinimalFrame } from "./MinimalFrame"
+
+/**
+ * Registry of built-in page frames. Page types can reference these by name
+ * via their `frame` property, and YAML config can override via
+ * `layout.byPageType.<name>.template`.
+ *
+ * The "default" frame reproduces the original three-column Quartz layout.
+ */
+const builtinFrames: Record<string, PageFrame> = {
+  default: DefaultFrame,
+  "full-width": FullWidthFrame,
+  minimal: MinimalFrame,
+}
+
+/**
+ * Resolve a frame by name. Returns the DefaultFrame if the name is not found,
+ * logging a warning for unknown frame names.
+ */
+export function resolveFrame(name: string | undefined): PageFrame {
+  if (!name || name === "default") {
+    return DefaultFrame
+  }
+  const frame = builtinFrames[name]
+  if (!frame) {
+    console.warn(
+      `Unknown page frame "${name}", falling back to "default". Available frames: ${Object.keys(builtinFrames).join(", ")}`,
+    )
+    return DefaultFrame
+  }
+  return frame
+}

quartz/components/frames/types.ts

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+import { JSX } from "preact"
+import { QuartzComponent, QuartzComponentProps } from "../types"
+
+/**
+ * Props passed to a PageFrame's render function.
+ * Contains the resolved layout components and the shared component data.
+ */
+export interface PageFrameProps {
+  /** Component data shared across all components on the page */
+  componentData: QuartzComponentProps
+  /** The Head component (rendered in <head>) — NOT used by frames, included for completeness */
+  head: QuartzComponent
+  /** Header slot components (rendered inside <header>) */
+  header: QuartzComponent[]
+  /** Components rendered before the page body */
+  beforeBody: QuartzComponent[]
+  /** The page body component (Content) */
+  pageBody: QuartzComponent
+  /** Components rendered after the page body */
+  afterBody: QuartzComponent[]
+  /** Left sidebar components */
+  left: QuartzComponent[]
+  /** Right sidebar components */
+  right: QuartzComponent[]
+  /** Footer component */
+  footer: QuartzComponent
+}
+
+/**
+ * A PageFrame defines the inner HTML structure of a page inside the
+ * `<div id="quartz-root">` shell. Different frames can produce completely
+ * different layouts (e.g. with/without sidebars, horizontal scroll, etc.)
+ * while the outer shell (html, head, body, quartz-root) remains stable
+ * for SPA navigation.
+ */
+export interface PageFrame {
+  /** Unique name for this frame (e.g. "default", "full-width", "minimal") */
+  name: string
+  /** Render the inner page structure. Returns a JSX tree to be placed inside Body > #quartz-body. */
+  render: (props: PageFrameProps) => JSX.Element
+  /** Optional CSS string to include when this frame is active */
+  css?: string
+}