feat: isometric SceneEditor, elements panel UX, image stamp#90

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feat/89-isometric-editor

Commits on May 3, 2026

feat: isometric SceneEditor, elements panel UX, image stamp on ground click

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Commits on May 4, 2026

feat: billboard stamps, collapsible elements, stamp→area toggler

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fix: disable New camera and Add model buttons until logic is implemented

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