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/text/tests.rs

@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: LGPL-2.1-only
+// Copyright (C) 2026 Liberux Labs, S. L. <info@liberux.net>
+
+use super::*;
+use crate::render::Canvas;
+
+fn make_canvas() -> Canvas { Canvas::new( 800, 600 ) }
+
+#[ test ]
+fn new_uses_documented_defaults()
+{
+	let t = Text::new( "hello" );
+	assert_eq!( t.content, "hello" );
+	assert_eq!( t.size,    16.0 );
+	assert_eq!( t.color,   Color::WHITE );
+	assert_eq!( t.align,   TextAlign::Left );
+}
+
+#[ test ]
+fn size_builder_overrides_default()
+{
+	let t = Text::new( "" ).size( 32.0 );
+	assert_eq!( t.size, 32.0 );
+}
+
+#[ test ]
+fn color_builder_overrides_default()
+{
+	let t = Text::new( "" ).color( Color::rgb( 1.0, 0.0, 0.0 ) );
+	assert_eq!( t.color, Color::rgb( 1.0, 0.0, 0.0 ) );
+}
+
+#[ test ]
+fn align_builder_can_target_each_variant()
+{
+	assert_eq!( Text::new( "" ).align( TextAlign::Left   ).align, TextAlign::Left   );
+	assert_eq!( Text::new( "" ).align( TextAlign::Center ).align, TextAlign::Center );
+	assert_eq!( Text::new( "" ).align( TextAlign::Right  ).align, TextAlign::Right  );
+}
+
+#[ test ]
+fn align_center_shorthand_matches_explicit_align()
+{
+	let a = Text::new( "" ).align_center();
+	let b = Text::new( "" ).align( TextAlign::Center );
+	assert_eq!( a.align, b.align );
+}
+
+#[ test ]
+fn preferred_size_returns_non_negative_dimensions()
+{
+	let canvas = make_canvas();
+	let ( w, h ) = Text::new( "ltk" ).preferred_size( 200.0, &canvas );
+	assert!( w >= 0.0 );
+	assert!( h >  0.0, "non-empty text reports a positive line height" );
+}
+
+#[ test ]
+fn preferred_size_caps_width_at_max_width()
+{
+	// A long string must not exceed the parent-supplied bound — text
+	// elides at draw time, so the layout pass needs to see at most
+	// `max_width`.
+	let canvas = make_canvas();
+	let long  = "the quick brown fox jumps over the lazy dog";
+	let ( w, _ ) = Text::new( long ).size( 24.0 ).preferred_size( 64.0, &canvas );
+	assert!( w <= 64.0, "preferred width must be clamped to max_width (got {w})" );
+}
+
+#[ test ]
+fn preferred_size_height_scales_with_font_size()
+{
+	let canvas = make_canvas();
+	let ( _, h_small ) = Text::new( "x" ).size( 12.0 ).preferred_size( 200.0, &canvas );
+	let ( _, h_large ) = Text::new( "x" ).size( 48.0 ).preferred_size( 200.0, &canvas );
+	assert!( h_large > h_small, "larger font must report taller line height" );
+}
+
+#[ test ]
+fn empty_content_still_reports_a_line_height()
+{
+	let canvas = make_canvas();
+	let ( _, h ) = Text::new( "" ).preferred_size( 200.0, &canvas );
+	// Even an empty string keeps the baseline metrics so a hidden field
+	// keeps its row height inside a column.
+	assert!( h > 0.0 );
+}
+
+#[ test ]
+fn text_align_enum_implements_partial_eq()
+{
+	// Compile-time guard: TextAlign must keep deriving PartialEq so
+	// downstream theming code can compare alignments.
+	assert_eq!( TextAlign::Left, TextAlign::Left );
+	assert_ne!( TextAlign::Left, TextAlign::Right );
+}