fixes the appearance of the start button

[tomjemmett]

if the browser was resized the start button can exhibit strange behaviour. this change makes the button sit inside its own div and then be right aligned. this prevents the button from filling the whole width of the container

[Copilot]

Pull request overview

This PR adjusts the Shiny UI layout so the dynamically-rendered “Start” button stays right-aligned and doesn’t behave oddly (or appear to stretch) after browser resize events.

Changes:

• Wraps the start_button uiOutput() in a right-aligned container in the UI.
• Simplifies the server-side start_button rendering by removing the bslib::layout_columns() wrapper and returning only the <a> button element.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
R/app_ui.R	Wraps uiOutput("start_button") in a right-aligned div to control layout on resize.
R/app_server.R	Removes layout_columns() around the Start link so the UI can handle alignment without column hacks.

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