fix(host): silence write-only cur_node_id on non-Linux encoder builds

cur_node_id (the capture 5-tuple's node id, added for the Linux dedicated-
game-exit check) is read only under #[cfg(target_os = "linux")], so on the
Windows nvenc/amf-qsv build it was assigned but never read — failing
`clippy -D warnings`. Read it on non-Linux platforms (the `let _ = &launch`
idiom already used in this file).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

crates/punktfunk-host/src/punktfunk1.rs

@@ -3387,6 +3387,11 @@ fn virtual_stream(ctx: SessionContext) -> Result<()> {
                 // library instead of surfacing a failure — rather than the capture-loss rebuild + 40 s
                 // timeout. Gated to the dedicated bare-spawn launch (`launch_is_nested`), so a normal
                 // Bazzite/desktop capture loss still rebuilds in place.
+                // `cur_node_id` (the capture 5-tuple's node id) is read only by the Linux
+                // dedicated-game-exit check below; keep it read on other platforms so it isn't a
+                // write-only variable under `-D warnings` (the `let _ = &launch` idiom above).
+                #[cfg(not(target_os = "linux"))]
+                let _ = &cur_node_id;
                 #[cfg(target_os = "linux")]
                 if launch.is_some()
                     && crate::vdisplay::launch_is_nested(compositor)