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/separator/mod.rs

@@ -0,0 +1,113 @@
+// SPDX-License-Identifier: LGPL-2.1-only
+// Copyright (C) 2026 Liberux Labs, S. L. <info@liberux.net>
+
+use crate::types::{ Color, Rect };
+use crate::render::Canvas;
+use super::Element;
+
+mod theme;
+
+/// A horizontal divider line.
+///
+/// Renders a 1 px (default) line across the full width of its layout rect,
+/// with vertical padding above and below. Use to break a column into
+/// visual sections — between settings groups, list categories or content
+/// blocks. The line takes the divider colour from the active theme by
+/// default; override with [`Self::color`] for custom palettes.
+///
+/// ```rust,no_run
+/// # use ltk::{ column, separator, text, Element };
+/// # #[ derive( Clone ) ] enum Msg {}
+/// # fn _ex() -> Element<Msg> {
+/// // In view():
+/// column()
+///     .push( text( "General" ) )
+///     .push( separator() )
+///     .push( text( "Network" ) )
+/// .into()
+/// # }
+/// ```
+pub struct Separator
+{
+	/// Stroke colour. Defaults to the theme's `divider` palette slot.
+	pub color:     Color,
+	/// Line thickness in logical pixels.
+	pub thickness: f32,
+	/// Vertical padding above and below the line, baked into
+	/// `preferred_size` so the divider visually centres in the row a
+	/// parent column allocates.
+	pub pad_v:     f32,
+}
+
+impl Separator
+{
+	/// Create a separator with the theme's default divider colour and
+	/// 1 px thickness.
+	pub fn new() -> Self
+	{
+		Self
+		{
+			color:     theme::color(),
+			thickness: theme::THICKNESS,
+			pad_v:     theme::PAD_V,
+		}
+	}
+
+	/// Override the stroke colour. Useful for emphasised dividers between
+	/// destructive actions.
+	pub fn color( mut self, color: Color ) -> Self
+	{
+		self.color = color;
+		self
+	}
+
+	/// Override the line thickness. Defaults to 1 logical pixel.
+	pub fn thickness( mut self, t: f32 ) -> Self
+	{
+		self.thickness = t;
+		self
+	}
+
+	/// Return the preferred `(width, height)`. Width is `max_width`;
+	/// height is `thickness + 2 × pad_v`.
+	pub fn preferred_size( &self, max_width: f32 ) -> (f32, f32)
+	{
+		( max_width, self.thickness + self.pad_v * 2.0 )
+	}
+
+	/// Draw the divider line into `canvas` at `rect`.
+	pub fn draw( &self, canvas: &mut Canvas, rect: Rect )
+	{
+		let y = rect.y + rect.height / 2.0;
+		canvas.draw_line( rect.x, y, rect.x + rect.width, y, self.color, self.thickness );
+	}
+}
+
+/// Create a default [`Separator`] (theme divider colour, 1 px thickness).
+///
+/// ```rust,no_run
+/// # use ltk::{ column, separator, text, Element };
+/// # #[ derive( Clone ) ] enum Msg {}
+/// # fn _ex() -> Element<Msg> {
+/// column()
+///     .push( text( "Section A" ) )
+///     .push( separator() )
+///     .push( text( "Section B" ) )
+/// .into()
+/// # }
+/// ```
+pub fn separator() -> Separator
+{
+	Separator::new()
+}
+
+impl<Msg: Clone> From<Separator> for Element<Msg>
+{
+	fn from( s: Separator ) -> Self
+	{
+		Element::Separator( s )
+	}
+}
+
+#[cfg(test)]
+mod tests;