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/laid_out.rs

@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: LGPL-2.1-only
+// Copyright (C) 2026 Liberux Labs, S. L. <info@liberux.net>
+
+use crate::types::{ Rect, WidgetId };
+use super::handlers::WidgetHandlers;
+
+/// Result of laying out one *interactive* widget — i.e. a widget that should
+/// receive pointer / touch hit-testing. Captures both the *hit rect* (where
+/// input lands) and the *paint rect* (the bounding box of everything the
+/// widget actually paints, including hover circles, focus rings, shadows…).
+/// The paint rect is used by the partial-redraw path to know how much of the
+/// canvas must be invalidated when a widget transitions in/out of a given
+/// state — it is always `>= rect`.
+///
+/// `handlers` carries the snapshot of the widget's callbacks/values at layout
+/// time so input dispatch is O(1) instead of re-walking the [`super::Element`] tree.
+///
+/// `keyboard_focusable` snapshots whether the widget should participate in the
+/// Tab / Shift+Tab cycle. Most interactive widgets are also keyboard-focusable
+/// (`Button`, `TextEdit`, `Slider`, …) but window-decoration chrome
+/// (`WindowButton`) is interactive without taking keyboard focus by default —
+/// matching the convention of macOS / GNOME / Windows title bars.
+pub struct LaidOutWidget<Msg: Clone>
+{
+	pub rect:               Rect,
+	pub flat_idx:           usize,
+	pub id:                 Option<WidgetId>,
+	pub paint_rect:         Rect,
+	pub handlers:           WidgetHandlers<Msg>,
+	pub keyboard_focusable: bool,
+	/// Cursor shape this widget wants to show on hover. Snapshotted
+	/// from [`super::Element::cursor_shape`] at layout time so the input
+	/// dispatch can pick the right shape without re-walking the
+	/// element tree.
+	pub cursor:             crate::types::CursorShape,
+	pub tooltip:            Option<String>,
+}
+
+impl<Msg: Clone> Clone for LaidOutWidget<Msg>
+{
+	fn clone( &self ) -> Self
+	{
+		Self
+		{
+			rect:               self.rect,
+			flat_idx:           self.flat_idx,
+			id:                 self.id,
+			paint_rect:         self.paint_rect,
+			handlers:           self.handlers.clone(),
+			keyboard_focusable: self.keyboard_focusable,
+			cursor:             self.cursor,
+			tooltip:            self.tooltip.clone(),
+		}
+	}
+}