release: finalize 0.15.0 validation and companion materials

Run conversation capture acceptance in a visible focused Electron window
and report concrete focus state on failure. Trigger Continue pre-spawn
cancellation at its existing environment callback instead of racing a timer.
Product implementation and approved bilingual note text remain unchanged.

Include the user's companion article updates and three reviewed draft images
as authorized. Keep their draft status and unverified build provenance clear.
Set the release date to September 28 and record the final real Linux result:
5345 passed, 51 skipped; Windows focused, typecheck, lint, and notes passed.

tests/support/magic-notes-capture-main.ts

@@ -13,7 +13,7 @@ const directory = process.env.GB_CAPTURE_DIRECTORY!
 app.setPath('userData', join(directory, 'profile'))
 
 app.whenReady().then(async () => {
-  const win = new BrowserWindow({ show: false, width: 1280, height: 900, webPreferences: {
+  const win = new BrowserWindow({ show: true, width: 1280, height: 900, webPreferences: {
     sandbox: true, contextIsolation: true, nodeIntegration: false, backgroundThrottling: false,
     preload: join(directory, 'preload.cjs')
   } })
@@ -46,7 +46,16 @@ app.whenReady().then(async () => {
       if (await run(script)) return
       await new Promise(resolve => setTimeout(resolve, 50))
     }
-    throw new Error(`Timed out: ${label}`)
+    const focus = await run(`(() => {
+      const title = document.querySelector('#compact-note-title');
+      const active = document.activeElement;
+      return { documentFocused: document.hasFocus(), activeId: active?.id,
+        activeTag: active?.tagName, activeLabel: active?.getAttribute('aria-label'),
+        titlePresent: Boolean(title), titleDisabled: title?.disabled,
+        titleVisible: title?.checkVisibility(), titleInert: Boolean(title?.closest('[inert]')),
+        saving: document.querySelector('.magic-note-panel')?.getAttribute('aria-busy') };
+    })()`)
+    throw new Error(`Timed out: ${label}; focus=${JSON.stringify(focus)}`)
   }
   function button(name: string, root = 'document'): string {
     return `[...${root}.querySelectorAll('button,[role="menuitem"]')].find(e => (e.getAttribute('aria-label') || e.textContent.trim()) === ${JSON.stringify(name)} && e.getClientRects().length)`
@@ -71,6 +80,9 @@ app.whenReady().then(async () => {
   let closed = false
   try {
     await win.loadURL(process.env.GB_CAPTURE_URL!)
+    win.focus()
+    win.webContents.focus()
+    await wait('document.hasFocus()', 'visible capture window focus')
     await wait('document.body.innerText.includes("CAPTURE_HISTORY_501_END")', 'App persisted history')
     assert.equal(await run('document.body.innerText.includes("CAPTURE_HISTORY_0_END")'), false, 'old history must initially be folded')
     // The last assistant reply is rendered by the real ChatTimeline.