Keep Bismillah below the reader toolbar after swipe navigation

[Copilot]

When changing surahs by swipe, opening a surah with no remembered reading position could render the Bismillah/header content underneath the fullscreen title bar. This updates the initial reader layout so first-load content starts below the toolbar instead of relying on a fixed top offset.

• Reader layout

  • Apply the top safe-area inset to the reader canvas while keeping the fullscreen toolbar overlay behavior unchanged.
  • Preserve the existing bottom/side spacing and swipe-based surah navigation flow.

• Regression coverage

  • Add a widget test that simulates a device with extra top inset, swipes to the next surah with no saved resume position, and asserts that the Bismillah header appears below the toolbar controls.

• Relevant change

  SafeArea(
    left: false,
    right: false,
    bottom: false,
    child: Padding(
      padding: const EdgeInsets.fromLTRB(8, 8, 8, 20),
      child: _ReaderCanvas(...),
    ),
  )

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