metal: fix updating of blob properties

[mahkoh]

No description provided.

[Copilot]

Pull request overview

This PR refactors object-id access by extending ObjWithId support to Rc<T> (and adding an Option helper), then uses those utilities in the Metal DRM backend to improve how blob-backed DRM properties (mode, gamma LUT, HDR metadata) are tracked and refreshed.

Changes:

• Add ObjWithId blanket impl for Rc<T> and introduce ObjWithIdOptExt::id_or_default() for Option<T>.
• Migrate several ObjWithId impls from Rc<...> wrappers to the underlying types, and make PropBlob implement ObjWithId.
• Update Metal backend blob-property handling to compare blob IDs against cached blob objects and adjust HDR metadata retrieval behavior.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/video/drm.rs	Makes PropBlob implement ObjWithId (removing the inherent id() method in favor of the trait).
src/utils/obj_and_id.rs	Adds ObjWithId for Rc<T> and an Option extension trait for defaulting IDs.
src/tree/workspace.rs	Moves ObjWithId impl to WorkspaceNode (leveraging new Rc<T> blanket impl).
src/tree/output.rs	Moves ObjWithId impl to OutputNode (leveraging new Rc<T> blanket impl).
src/state.rs	Moves ObjWithId impls to ConnectorData / DrmDevData (leveraging new Rc<T> blanket impl).
src/ifs/wl_surface/xdg_surface/xdg_toplevel/xdg_toplevel_icon_v1.rs	Moves ObjWithId impl to XdgToplevelIconV1 (leveraging new Rc<T> blanket impl).
src/ifs/wl_surface/commit_timeline.rs	Moves ObjWithId impl to Inner (leveraging new Rc<T> blanket impl).
src/cursor_user.rs	Moves ObjWithId impl to CursorUser (leveraging new Rc<T> blanket impl).
src/backends/metal/video.rs	Adjusts HDR metadata initialization and blob-id change detection for connector/crtc properties.
src/backends/metal/transaction.rs	Imports ObjWithId (needed now that PropBlob::id() is trait-based).
src/backend.rs	Moves ObjWithId impl to BackendGammaLut (leveraging new Rc<T> blanket impl).

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