[codex] align main content pages with AppPageShell

[D1a0y1bb]

What changed

• Routed history, report center, evidence collection, fingerprint, and whitelist main pages through the verified AppPageShell scroll-edge container.
• Removed duplicate outer padding and top safe-area handling from those pages so titlebar blur follows the same main-content structure as the already working screens.

Why

Several primary pages used custom top-level VStack layouts, so they did not participate in the same titlebar scroll-edge behavior as Workbench, New Audit, Workbench Map, and Settings.

Validation

• git diff --check
• swift test --package-path PitcherPlantApp
• xcodebuild -project PitcherPlantApp/PitcherPlantApp.xcodeproj -scheme PitcherPlantApp -destination 'platform=macOS' test
• ./PitcherPlantApp/script/build_and_run.sh --verify
• Live app smoke check for History, Report Center, All Evidence, Fingerprint Library, and Whitelist pages

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch D1a0y1bb/app-page-shell-pages

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