shiny-bslib-theming

# Theming Shiny Apps with bslib Customize Shiny app appearance using bslib's Bootstrap 5 theming system. From quick Bootswatch themes to advanced Sass customization and dynamic color mode switching. ## Quick Start **"shiny" preset (recommended starting point):** ```r page_sidebar( theme = bs_theme(), # "shiny" preset by default — polished, not plain Bootstrap ... ) ``` **Bootswatch theme (for a different visual style):** ```r page_sidebar( theme = bs_theme(preset = "zephyr"), # or "cosmo", "minty", "darkly", etc. ... ) ``` **Custom colors and fonts:** ```r page_sidebar( theme = bs_theme( version = 5, bg = "#FFFFFF", fg = "#333333", primary = "#2c3e50", base_font = font_google("Lato"), heading_font = font_google("Montserrat") ), ... ) ``` **Auto-brand from `_brand.yml`:** If a `_brand.yml` file exists in your app or project directory, `bs_theme()` automatically discovers and applies it. No code changes needed. Requires the `brand.yml` R package. ```r bs_theme(brand = FALSE) # Disable auto-discovery bs_theme(brand = TRUE) # Require _brand.yml (error if not found) bs_theme(brand = "path/to/brand.yml") # Explicit path ``` ## Theming Workflow 1. Start with the `"shiny"` preset (default) or a Bootswatch theme close to your desired look 2. Customize main colors (`bg`, `fg`, `primary`) 3. Adjust fonts with `font_google()` or other font helpers 4. Fine-tune with Bootstrap Sass variables via `...` or `bs_add_variables()` 5. Add c...