The native runner outgrew the `examples/` slot — it owns DPI tracking,
caret-blink animation timer, panel-resize cursor, the full Cmd+wheel /
PinchGesture / Pixel/LineDelta dispatch table, etc. None of that is a
sample, so it's been promoted to a real crate.
* New crate `crates/openpencil-desktop/` with a single `[[bin]]`
target. Depends on `openpencil-shell-native` (lib) + winit +
skia-safe (gl), gated to macOS / Linux / Windows.
* `examples/inspector_window.rs` removed; equivalent code lives at
`crates/openpencil-desktop/src/main.rs` with the structs renamed
(DesktopApp / paint) and the doc-block rewritten as a runner spec.
* Run command: `cargo run -p openpencil-desktop --release`. Old
command (`--example inspector_window`) is gone.
* Workspace glob `crates/*` already picks up the new crate, no
Cargo.toml workspace edit needed.
* Docs: crates/CLAUDE.md updated with the new crate row and runner
section retitled "Desktop binary". Top-bar layout test renamed +
uses the TOP_BAR_HEIGHT constant so future height tweaks stop
breaking it.
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