Cursors: Krea-Grafiken in voller Auflösung, Blank-Cursor beim Malen, normalisierte Hotspots

- Cursor_Normal/Paint/Pipette: generierte Grafiken jetzt in Vollauflösung (766-829 px, Max Size im Importer steuert Anzeigegröße), Paint-Ring-Inneres freigestellt
- Neuer Cursor_Blank (transparent): wird während eines Strokes auf dem Mesh gesetzt statt Cursor.visible zu togglen (fixt Flicker-Kampf mit dem Orbit-Input)
- CursorController: Hotspots normalisiert (0-1, unabhängig von Import Max Size); Zustandskette Pipette > (Stroke ? Blank : Paint) > Normal; off-mesh während Stroke -> Normal
- MeshPainter: StrokeInProgress-Flag (Maustaste auf Paint-Pfad gehalten)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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Assets/Textures/Cursors/Cursor_Normal.png.meta

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Assets/Textures/Cursors/Cursor_Paint.png.meta

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Assets/Textures/Cursors/Cursor_Pipette.png.meta

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