[uyujkk]

Summary

The first step of finishing stage J. 63bc706 records the inventory and a nine-step plan in UI-Structure-Plan.md; a9a9844 is step 1.

Inventory and new completion criteria (63bc706, docs only)

• Startup baseline: the window first appears at about 1,060 ms, and about 280 ms of that creates the window XAML and all six pages.
• The remaining 10,421 window lines are listed by area (state slots, combinations, install flow, updates and downloads, repositories and configuration, shortcut sending, previews, launcher, page wiring and the shell), with difficulty, risk and which host-interface members use each.
• Each step is one PR, lowest risk first.
• The completion criteria now read: no business logic in the window and about 4,000 lines or fewer, with 3,000 (step 9) optional. The maintainer approved this change.

Step 1: Settings, Dashboard, Updates and Shortcuts are created on first use (a9a9844)

• The four pages only talk to the window through services and view models, and draw from the current state when they're created, so a language, theme or data change made before then is picked up.
• The Dashboard's path boxes join the window's text-box tracking when the page is created.
• Navigation, the command palette, nav badges, the first-run guide and the tray all use the same page lookup, so they work before a page exists.
• The Online and workspace pages are still created with the window (steps 3 and 7).
• Settings balance fix (follow-up to Settings: even out the two columns on wide windows #119): the balance ran once and could run before the groups were laid out, so the English layout differed between light and dark. It now waits for the group heights and balances again once the panels settle, at most a few rounds per width.

Startup (startup.log, median of 7 runs each, from process start)

Start page	First window, before	After	Creating pages, before	After
Dashboard	1,065 ms	989 ms	280 ms	127 ms
Workspace	1,055 ms	936 ms	278 ms	126 ms

Test plan

• scripts\test-all.ps1: 1,788 Core tests, Release build 0 warnings, Core coverage 94.0% line / 88.2% branch
• UI tests 64/64 on the same build, including the page round-trip tests. The new PageHostTests:
  • start on each of the six pages, switch to English and the dark theme, then visit every page;
  • check each shows the English title and dark theme, whether it was created before or after the change.
• Code-style check
• Screenshots of Dashboard, Settings, Updates and Shortcuts (zh/en/ru × light/dark, 1400×900) match the build before the change. The only differences are a few edge pixels and the English dark Settings layout, which is the balance fix.
• Full package with the real mouse: started on Updates, Shortcuts and the Dashboard; each time changed language and theme from the lists and switched pages 12 times. No errors.

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