docs(example): one page wiring the whole navigation group together

examples/basic-app/app/pages/navigation.wrn puts all nine navigation
components in a single console shell instead of showing each alone: Navbar
with a nested dropdown, MegaMenu beside it, Breadcrumb, Sidebar as a rail that
becomes a Drawer, Tabs backed by a query parameter, a Stepper wizard,
Pagination, Scrollspy following the article, and Nav in the footer.

Three framework limits shaped the layout and are written into the page rather
than hidden:

  - object props are held in state and bound, because a brace at the start of
    an attribute is read as an interpolation
  - a shared function on a page is compiled standalone and cannot see page
    state by name, so state is passed as arguments
  - component props and slot content render once and do not track page state,
    so anything that has to react lives in page scope; Tabs reports the
    selection and the page owns what is shown

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

examples/component-showcase/app/pages/components/stepper.wrn

@@ -368,14 +368,14 @@ page StepperDetail {
       </article>
       <article class="demo-case">
         <header class="demo-case-header">
-          <div><span class="demo-case-eyebrow">Advanced</span><h2>Wizard with content and controls</h2><p>showPanel renders each step body and shows only the active one, the same contract Tabs uses. controls adds Back, Skip and Next, which becomes Finish on the last step. nextDisabled is how a form holds the step: the component never validates anything itself, so the page sets it while the step is incomplete and clears it once the step passes.</p></div>
+          <div><span class="demo-case-eyebrow">Advanced</span><h2>Wizard with content and controls</h2><p>showPanel renders each step body and shows only the active one, the same contract Tabs uses. controls adds Back, Skip and Next, which becomes Finish on the last step.</p></div>
           <span class="demo-case-number">03</span>
         </header>
         <div class="demo-workbench">
           <div id="stepper-demo-3" class="demo-canvas demo-canvas--3">
             <div class="demo-browser-chrome"><span></span><span></span><span></span><small>Live preview</small></div>
             
-            <div class="demo-render"><Stepper size="lg" steps='[{"label":"Account","title":"Your details","content":"Name, email and a password."},{"label":"Billing","title":"How you pay","content":"Card or invoice, plus a billing address."},{"label":"Confirm","title":"Review","content":"Check everything before submitting."}]' active="1" clickable="false" label="Advanced example" showPanel="true" controls="true" allowSkip="true" nextDisabled="false" backLabel="Back" nextLabel="Next" skipLabel="Skip" finishLabel="Finish" class="showcase-instance showcase-instance--3" /></div>
+            <div class="demo-render"><Stepper size="lg" steps='[{"label":"Account","title":"Your details","content":"Name, email and a password."},{"label":"Billing","title":"How you pay","content":"Card or invoice."},{"label":"Confirm","title":"Review","content":"Check everything before submitting."}]' active="1" clickable="false" label="Advanced example" showPanel="true" controls="true" allowSkip="true" nextDisabled="false" backLabel="Back" nextLabel="Next" skipLabel="Skip" finishLabel="Finish" class="showcase-instance showcase-instance--3" /></div>
           </div>
           <section class="demo-code" aria-label="Wizard with content and controls usage">
             <header><span><span class="icon-[lucide--code-2] size-4" aria-hidden="true"></span>Component usage</span><small>.wrn</small></header>
@@ -390,7 +390,7 @@ page StepperDetail {
     <span>&#123;</span>
       "label": "Billing",
       "title": "How you pay",
-      "content": "Card or invoice, plus a billing address."
+      "content": "Card or invoice."
     <span>&#125;</span>,
     <span>&#123;</span>
       "label": "Confirm",
@@ -415,14 +415,14 @@ page StepperDetail {
       </article>
       <article class="demo-case">
         <header class="demo-case-header">
-          <div><span class="demo-case-eyebrow">Advanced</span><h2>Held until the step is valid</h2><p>The same wizard with nextDisabled set. Next stays held, so a form can keep the reader on the step until it validates.</p></div>
+          <div><span class="demo-case-eyebrow">Advanced</span><h2>Held until the step is valid</h2><p>The same wizard with nextDisabled set. The component never validates anything itself: the page owns the form, sets this while the step is incomplete, and clears it once the step passes.</p></div>
           <span class="demo-case-number">04</span>
         </header>
         <div class="demo-workbench">
           <div id="stepper-demo-4" class="demo-canvas demo-canvas--4">
             <div class="demo-browser-chrome"><span></span><span></span><span></span><small>Live preview</small></div>
             
-            <div class="demo-render"><Stepper size="lg" steps='[{"label":"Account","title":"Your details","content":"This step has not been completed yet."},{"label":"Billing","title":"How you pay","content":"Card or invoice."}]' active="0" clickable="false" label="Advanced example" showPanel="true" controls="true" allowSkip="false" nextDisabled="true" backLabel="Back" nextLabel="Next" skipLabel="Skip" finishLabel="Finish" class="showcase-instance showcase-instance--4" /></div>
+            <div class="demo-render"><Stepper size="lg" steps='[{"label":"Account","title":"Your details","content":"This step is not complete yet."},{"label":"Billing","title":"How you pay","content":"Card or invoice."}]' active="0" clickable="false" label="Advanced example" showPanel="true" controls="true" allowSkip="false" nextDisabled="true" backLabel="Back" nextLabel="Next" skipLabel="Skip" finishLabel="Finish" class="showcase-instance showcase-instance--4" /></div>
           </div>
           <section class="demo-code" aria-label="Held until the step is valid usage">
             <header><span><span class="icon-[lucide--code-2] size-4" aria-hidden="true"></span>Component usage</span><small>.wrn</small></header>
@@ -432,7 +432,7 @@ page StepperDetail {
     <span>&#123;</span>
       "label": "Account",
       "title": "Your details",
-      "content": "This step has not been completed yet."
+      "content": "This step is not complete yet."
     <span>&#125;</span>,
     <span>&#123;</span>
       "label": "Billing",