feat(client/windows): invert scroll direction

The Apple client's toggle, wired through the shared session presenter:
Settings::invert_scroll -> SessionOpts -> Capture, applied at the single
seam where wheel deltas enter (before accumulation, so the fractional
remainders stay consistent with what was actually sent).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

clients/session/src/console.rs

@@ -158,6 +158,7 @@ pub fn run(target: Option<&str>) -> u8 {
             v => v,
         },
         touch_mode: settings_at_start.touch_mode(),
+        invert_scroll: settings_at_start.invert_scroll,
         json_status,
         on_connected: Some(Box::new(move |fingerprint: [u8; 32]| {
             let fp_hex = trust::hex(&fingerprint);

clients/session/src/main.rs

@@ -373,6 +373,7 @@ mod session_main {
                 v => v,
             },
             touch_mode: settings.touch_mode(),
+            invert_scroll: settings.invert_scroll,
             json_status: true,
             on_connected: Some(Box::new(|fingerprint: [u8; 32]| {
                 // This host's card carries the accent bar in the desktop client now.

clients/windows/src/app/settings.rs

@@ -380,6 +380,10 @@ pub(crate) fn settings_page(
     let touch_combo = setting_combo(ctx, "Touch input", touch_names, touch_i, |s, i| {
         s.touch_mode = TOUCH_MODES[i].0.to_string();
     });
+    let invert_scroll_toggle =
+        setting_toggle(ctx, "Invert scroll direction", s.invert_scroll, |s, on| {
+            s.invert_scroll = on
+        });
     let shortcuts_toggle = setting_toggle(
         ctx,
         "Capture system shortcuts (Alt+Tab, Win, \u{2026})",
@@ -523,11 +527,17 @@ pub(crate) fn settings_page(
             );
             out.extend(group(
                 Some("Keyboard & mouse"),
-                vec![described(
-                    shortcuts_toggle,
-                    "Alt+Tab, the Windows key and friends reach the host while the stream has \
-                     input captured. Off, they act on this machine instead.",
-                )],
+                vec![
+                    described(
+                        shortcuts_toggle,
+                        "Alt+Tab, the Windows key and friends reach the host while the stream \
+                         has input captured. Off, they act on this machine instead.",
+                    ),
+                    described(
+                        invert_scroll_toggle,
+                        "Reverses the wheel and trackpad scroll direction sent to the host.",
+                    ),
+                ],
                 None,
             ));
             ("Input", out)