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/input/pointer/release.rs

@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: LGPL-2.1-only
+// Copyright (C) 2026 Liberux Labs, S. L. <info@liberux.net>
+
+use smithay_client_toolkit::seat::pointer::PointerEvent;
+use smithay_client_toolkit::reexports::client::
+{
+	protocol::wl_pointer::WlPointer,
+	Connection, QueueHandle,
+};
+
+use crate::app::App;
+use crate::event_loop::{ AppData, SurfaceFocus };
+
+impl<A: App> AppData<A>
+{
+	pub( super ) fn on_pointer_release(
+		&mut self,
+		_conn:    &Connection,
+		_qh:      &QueueHandle<Self>,
+		_pointer: &WlPointer,
+		event:    &PointerEvent,
+	)
+	{
+		let focus = self.focus_for_surface( &event.surface )
+			.unwrap_or( SurfaceFocus::Main );
+		let pos = self.surface( focus ).to_physical( event.position.0, event.position.1 );
+		self.pointer_pos = pos;
+		self.app.on_pointer_move( pos.x, pos.y );
+		self.app.on_pointer_button( pos.x, pos.y, false );
+		let global_drag = self.has_active_long_press_drag();
+		let swipe       = self.swipe_config( focus );
+		let events_out =
+		{
+			let ss = self.surface_mut( focus );
+			ss.needs_redraw = true;
+			ss.gesture.on_release( pos, &ss.widget_rects, &swipe, global_drag )
+		};
+		self.apply_release_events( focus, events_out );
+		// Cancel any held-button repeat — the press is
+		// over, so the timer no longer has anything to
+		// fire against.
+		self.stop_button_repeat();
+		// Slider drag (if any) just ended — cursor reverts
+		// from `Grabbing` to whatever the hovered widget
+		// asks for.
+		self.dispatch_cursor_shape( focus );
+	}
+}