Switch stages up and down

[OpenSauce]

Must be a better way of doing this but kept hitting issues

[Copilot]

Pull Request Overview

This PR introduces stage reordering functionality by adding move-up and move-down buttons to various stage widgets. Key changes include the addition of new messages (MoveStageUp and MoveStageDown), updating all stage widget functions to accept a total_stages parameter, and refactoring the header UI elements to use the new icon_button.

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/gui/widgets/tonestack.rs	Added up/down buttons to reorder ToneStack stages and updated header text.
src/gui/widgets/preamp.rs	Added up/down buttons for Preamp stages with total stage count parameter.
src/gui/widgets/poweramp.rs	Introduced stage reordering and adjusted header alignment styling.
src/gui/widgets/filter.rs	Updated Filter widget with move-stage buttons and new total_stages parameter.
src/gui/widgets/compressor.rs	Integrated move-stage buttons into Compressor widget, similar to others.
src/gui/widgets/mod.rs	Added a reusable icon_button helper and ICONS_FONT constant.
src/gui/amp.rs	Added handling for MoveStageUp and MoveStageDown messages in the stage update logic.

Comments suppressed due to low confidence (1)

src/gui/widgets/tonestack.rs:19

• [nitpick] Consider reviewing the case and spacing in the header text for consistency; either use 'ToneStack' or 'Tonestack' uniformly across all widgets.

let mut header = row![text(format!("Tonestack {}", idx + 1))].spacing(5);