refactor: split every monolithic module into focused submodules

Each source file that had grown beyond a single concern is replaced by an identically-named directory containing focused submodules. `src/event_loop/mod.rs` (878 lines) becomes a directory with clipboard, context_menu, cursor_shape, drag, focus, handlers, invalidation, overlays_reconcile, repeat, run, surface, text_editing, and tooltip. Every widget, input handler, and theme component follows the same split. Public interfaces are unchanged — only the internal file layout moves.
image bumped from 0.25.2 to 0.25.9.

src/widget/anchored_overlay/tests.rs

@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: LGPL-2.1-only
+// Copyright (C) 2026 Liberux Labs, S. L. <info@liberux.net>
+
+use super::*;
+
+#[ test ]
+fn resolve_rect_uses_anchor_when_present()
+{
+	let anchor   = Rect { x: 100.0, y: 50.0, width: 200.0, height: 40.0 };
+	let fallback = Rect { x: 0.0, y: 0.0, width: 800.0, height: 600.0 };
+	let r = AnchoredOverlay::<()>::resolve_rect( Some( anchor ), 8.0, fallback );
+	assert_eq!( r.x, 100.0 );
+	assert_eq!( r.y, 98.0 );          // anchor.y + height + gap
+	assert_eq!( r.width, 200.0 );      // anchor width
+	assert_eq!( r.height, 600.0 );     // fallback height
+}
+
+#[ test ]
+fn resolve_rect_falls_back_when_anchor_missing()
+{
+	let fallback = Rect { x: 5.0, y: 6.0, width: 7.0, height: 8.0 };
+	let r = AnchoredOverlay::<()>::resolve_rect( None, 8.0, fallback );
+	assert_eq!( r, fallback );
+}