Add mouse window controls and finer display scaling (#63)

Add configurable mouse and wheel bindings, window move and resize, tab drops, cross-output dragging, and device settings. Adjust display scaling in 0.05 increments.

Preserve opposite-edge positioning during scrolling resizes and show rows for edge drops into tabbed columns.

shell/ferese-settings/src/schema.rs

@@ -827,6 +827,69 @@ pub fn fields(page: Page) -> Vec<Field> {
                 "Avoid accidental pointer movement.",
                 true,
             ),
+            toggle(
+                "input.touchpad.disable_while_mouse_connected",
+                "Disable touchpad with a mouse",
+                "Pause the built-in touchpad while an external mouse is connected.",
+                false,
+            ),
+            range(
+                "input.touchpad.accel_speed",
+                "Touchpad speed",
+                "Adjust pointer acceleration for the touchpad.",
+                RangeSpec {
+                    default: 0.0,
+                    min: -1.0,
+                    max: 1.0,
+                    step: 0.05,
+                    suffix: "",
+                    integer: false,
+                },
+            ),
+            toggle(
+                "input.mouse.natural_scroll",
+                "Mouse natural scrolling",
+                "Reverse the direction of the mouse wheel.",
+                false,
+            ),
+            toggle(
+                "input.mouse.left_handed",
+                "Left-handed mouse",
+                "Swap the primary and secondary mouse buttons.",
+                false,
+            ),
+            toggle(
+                "input.mouse.middle_emulation",
+                "Emulate middle click",
+                "Press both mouse buttons together to middle-click.",
+                false,
+            ),
+            range(
+                "input.mouse.accel_speed",
+                "Mouse speed",
+                "Adjust pointer acceleration for connected mice.",
+                RangeSpec {
+                    default: 0.0,
+                    min: -1.0,
+                    max: 1.0,
+                    step: 0.05,
+                    suffix: "",
+                    integer: false,
+                },
+            ),
+            range(
+                "input.mouse.scroll_factor",
+                "Mouse scroll speed",
+                "Scale wheel scrolling in applications.",
+                RangeSpec {
+                    default: 1.0,
+                    min: 0.1,
+                    max: 5.0,
+                    step: 0.1,
+                    suffix: "×",
+                    integer: false,
+                },
+            ),
             range(
                 "input.touchpad.swipe_threshold",
                 "Swipe distance",