fix: Argon skin corruption + ppy cherry-pick + surface format + safe-mode shader wipe - #343

…mode shader wipe

Changes:
- Cherry-pick ppy editor toolbox icons commit: new OsuIcon entries (EditorHit,
  EditorDrumRoll, EditorSwell, EditorFruit, EditorJuiceStream, EditorBananaShower,
  EditorNote, EditorHoldNote) and all 8 composition tools updated to use SpriteIcon
  instead of BeatmapStatisticIcon. Bump osu-resources to 2026.519.0.
- Fix Argon skin visual corruption (white circles, off-hue TrianglesV2 on buttons):
  Force-wipe the shader pipeline cache in ForceOpenGLRendererIfSafeMode(). When a
  Vulkan session dies mid-compile (ANR), the shader cache sentinel is already marked
  'done for v241' but partial/misaligned SPIR-V blobs remain on disk. The rescue
  OpenGL session then picks up these stale shaders which were compiled against the
  old GlobalUniformData layout (pre-UniformPadding12 alignment fix). Result: the
  masking uniform (CornerRadius clip) and gradient colour uniform are read from wrong
  struct offsets → Argon hit circles appear as white squares, button TrianglesV2
  shows wrong hues. Wiping unconditionally on every safe-mode entry fixes this.
- Make pre-SDL Window.SetFormat(RGBA8888) unconditional (remove IsVulkanConfigured
  guard). Ensures 32-bit colour in both Vulkan and OpenGL modes; prevents an RGB565
  initial surface allocation that causes colour-channel artefacts in early frames of
  the OpenGL rescue session.

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…per-dash colour tests

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…itExplosion null Drawable, fix iOS xcode-select

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…le properly nullable

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…sources (hasPear=true)

TestSkin was using null resource store, causing CatchLegacySkinTransformer
to see hasPear=false and return null for the fruit component. This caused
SkinnableDrawable to fall back to DefaultFruitPiece, which always uses
DEFAULT_HYPER_DASH_COLOUR regardless of skin config.

Fix: implement IStorageResourceProvider in the test scene and pass it to
TestSkin, which now uses a NamespacedResourceStore pointing to the built-in
legacy skin assets (Skins/Legacy). This makes hasPear=true, returning
LegacyFruitPiece, which correctly reads hyper-dash colours from skin config.

Also fix iOS CI workflow: resolve MacOSX.sdk symlink target to its canonical
path (via python3 os.path.realpath) to prevent ELOOP (too many symlink levels)
when the symlink target is itself a symlink chain.

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