feat(desktop): Focus + Standup screens + burn-up cone (#16)

First real P3 screens, replacing the placeholders:
- FocusScreen — Now/Next/Later cards (Now = jade + Start/Defer footer),
  each with #id, label tags, steeping badge, agent-font rationale, and
  a title link that drives the shell issue drill-in. Milestone card
  wraps the burn-up cone.
- StandupScreen — typeset letter: overnight drift (dot + delta), per-
  person plan (initials avatars), warn-tint stale-blocker nag; sections
  settle in on a 90ms stagger, reduced-motion-safe.
- charts/chart.tsx — BurnUpCone (actual polyline, forecast cone with
  dashed 80% bounds, jade today rule) + RunwayBar (for P3-5). Fixed
  sample geometry until P2 feeds it.

Fixtures (today/focus/standup) mirrored from data.js. Shell routes
focus/standup to the real screens; the drill-in now starts from a Focus
card. Screenshot helper freezes animations so fade-in screens capture
settled. typecheck + 9 e2e green; light/standup/states verified.

Closes P3-3.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/desktop/e2e/pages/app.page.ts

@@ -37,10 +37,12 @@ export class AppPage {
     )
   }
 
-  /** Capture a full-page screenshot for visual review; returns the path. */
+  /** Capture a full-page screenshot for visual review; returns the path.
+   * `animations: 'disabled'` fast-forwards finite CSS animations to their end
+   * state, so fade-in screens (e.g. Standup) capture settled, not mid-fade. */
   async screenshot(name: string): Promise<string> {
     const path = join(SCREENS_DIR, `${name}.png`)
-    await this.page.screenshot({ path, fullPage: true })
+    await this.page.screenshot({ path, fullPage: true, animations: 'disabled' })
     return path
   }
 }