Add Windows 98 inspired app skin

[JZauner]

Motivation

• Provide a purely cosmetic Windows 98-style skin for the Shiny app to give the UI a retro look while leaving functionality unchanged.

Description

• Add a new stylesheet inst/app/www/windows-98.css implementing Win98 colors, chrome, fonts, and rules for navbars, cards, accordions, buttons, forms, tables, tooltips, and value boxes.
• Wire the stylesheet into the app UI by adding a header link in R/LightLogWeb-app.R that references the resource at extr/windows-98.css.
• Reuse the existing resource path registration addResourcePath("extr", system.file("app/www", package = "LightLogWeb")) so assets are served locally, and avoid adding new dependencies or JS.

Testing

• Ran git diff --check to validate whitespace/patch issues and it succeeded.
• Ran a Python check script to count CSS braces for basic syntax balance ({/}) and it succeeded.
• Attempted R CMD check --no-manual --no-build-vignettes . but it could not run in this environment because R is not installed, so package checks and an interactive app launch were not performed.

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Codex Task

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Exclude modal close buttons from global button skin

Because this selector applies the Win98 button background to every button, it also matches Bootstrap 5 modal close controls (button.btn-close). The background: ... !important in this rule resets the close control's built-in background image, so Shiny modals such as no_dataset_modal()/import_modal_successfull() lose their visible “X” close affordance; scope the skin to .btn/.action-button or explicitly exclude/restore .btn-close.

Useful? React with 👍 / 👎.