feat(host/windows): ViGEm rumble back-channel + Windows clippy clean

Wire the host→client rumble path on Windows, the analogue of the Linux
uinput EV_FF read loop: a game's force-feedback on the virtual Xbox 360
pad is delivered by ViGEm's notification API (`request_notification` →
`spawn_thread`, gated by the crate's `unstable_xtarget_notification`
feature). A per-pad background thread stores the latest motor levels;
`pump_rumble` relays changes to the client on the universal 0xCA plane
(motors scaled 0..255 → 0..65535). Dropping the target aborts the
notification, so the thread exits with the session. Live verification
still needs a physical pad.

Also fix the Windows backends' clippy debt — these modules are cfg-
excluded from Linux CI, so `clippy -D warnings` never saw them, and the
VM's rustc 1.96 clippy is stricter on shared code than the CI image:
- dxgi: manual checked division → checked_div().map_or
- sendinput: `x = x | y` → `x |= y`
- sudovda: `.then(|| ptr)` → `.then_some(ptr)`
- m3 pick_compositor: drop the needless early return (match form)
- m3 resolve_compositor: Windows arm is a tail expr, not `return`

All Windows backends now build + clippy clean (default and --features
nvenc); Linux unaffected (fmt/clippy/check green).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

crates/punktfunk-host/src/capture/dxgi.rs

@@ -152,11 +152,9 @@ impl DuplCapturer {
                 .filter(|&hz| hz > 0)
                 .unwrap_or_else(|| {
                     let r = dd.ModeDesc.RefreshRate;
-                    if r.Denominator > 0 {
-                        (r.Numerator / r.Denominator).max(1)
-                    } else {
-                        60
-                    }
+                    r.Numerator
+                        .checked_div(r.Denominator)
+                        .map_or(60, |hz| hz.max(1))
                 });
             let timeout_ms = std::env::var("PUNKTFUNK_CAPTURE_TIMEOUT_MS")
                 .ok()