## Summary
The desktop browser suite can mount `InteractiveArea` before its utility
styles settle, then scroll history while the reply composer is still
expanding. A pending Virtua tail scroll can replace the message that the
test selected and make the scrollport assertion fail.
This addresses the pre-existing browser-test failure reported during
#2506 ([CI
failure](https://github.com/moeru-ai/airi/actions/runs/34448585692/job/102804067154)).
- Scan desktop and shared Vue components before the initial test
stylesheet is served. Load the desktop UnoCSS config explicitly so
config discovery does not replace the scan.
- Give each fixture a window-sized host, reset the viewport, and dispose
the component, host, and Pinia after each test.
- Wait for the reply transition and virtual-list measurements to settle
before scrolling. Cover both 200 ms and 1 s transitions, and assert the
requested scroll position throughout the existing message-mount checks.
Only browser tests and their configuration change.
## Validation
The complete desktop browser suite passed with three shuffled seeds: **6
files, 65 tests per run**, with no skipped tests.
```sh
for seed in 2508 2506 2507; do
npm_config_registry=https://registry.npmjs.org/ NODE_OPTIONS=--no-experimental-webstorage \
pnpm exec vitest run --config apps/stage-tamagotchi/vitest.config.ts \
--project browser --sequence.shuffle --sequence.seed="$seed" --bail=1
done
npm_config_registry=https://registry.npmjs.org/ pnpm run typecheck
npm_config_registry=https://registry.npmjs.org/ pnpm run lint
git diff --check
```
Typecheck passed all 52 tasks. Lint passed with existing repository
warnings. ResizeObserver loop warnings remain visible; this change does
not suppress them. Linux CI validation is pending.
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