Update snapshot tests after merge with v0.34.0

Regenerated from macOS CI run #23602213577.
56 snapshots updated to reflect both text shaping changes
and v0.34.0 visual updates (scroll fade, etc.).

crates/egui_demo_lib/tests/snapshots/tessellation_test/Additive rectangle.png

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crates/egui_demo_lib/tests/snapshots/tessellation_test/Blurred stroke.png

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crates/egui_demo_lib/tests/snapshots/tessellation_test/Minimal rounding.png

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crates/egui_demo_lib/tests/snapshots/tessellation_test/Normal.png

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crates/egui_demo_lib/tests/snapshots/tessellation_test/Thick stroke, minimal rounding.png

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crates/egui_demo_lib/tests/snapshots/tessellation_test/Thin filled.png

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crates/egui_demo_lib/tests/snapshots/tessellation_test/Thin stroked.png

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