New leaf crate op-util single-sources hex-color parsing (9 divergent
copies, one with a non-ASCII panic), JSON escaping (one copy was
lossy), and HTML/XML escaping (one copy missed the quote entity — an
attribute-injection gap). Desktop now delegates image generate/search,
settings payload serde, and the --mcp/--serve-web argv dispatch to
op-host-services / op-editor-host-core instead of carrying drifted
copies. Byte-identical widget_host twin files collapse into shared
op-editor-core host_ui_transitions. Auth routes, the MCP port, product
name, env-var names, service URLs, and status colors move to single
shared constants / theme tokens; the stale claude-sonnet-4-5 default
model id is corrected.
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