Extract native image clipboard support to main - #222
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Current WebScene main handles native paste through
clipboard.readText(), so image-only clipboard data is successfully returned by AppScene and then discarded before a DOMpasteevent. This extracts the already-qualified image clipboard implementation from consolidation PR #76 onto current main.The runtime now requests any supported representation, exposes image bytes as a browser-shaped
DataTransferItem/File/FileList, preserves MIME and bytes, and rejects unsupported or non-text responses with the matching DOMException. Focused regressions cover the exact PNG metadata and bytes, unsupported MIME,readText()type safety, the 16 MiB bound, and the existing 10,000-operation clipboard budgets.Closes #86. Resolves the WebScene portion of SceneTech/AppScene#69.
Validation before merge: exact
portable-v8-contractrunner on this PR head. The final packaged application gate will be rebuilt and rerun after the focused merge.