Port improvements from statsExpressions v1.7.3

## Changes

### New Files
- Add `.github/copilot-instructions.md` with package-specific guidance

### Dependency Updates (in DESCRIPTION)
- statsExpressions: >= 1.7.2 -> >= 1.7.3
- dplyr: >= 1.1.4 -> >= 1.2.0
- ggplot2: >= 4.0.1 -> >= 4.0.2
- insight: >= 1.4.3 -> >= 1.4.6
- paletteer: >= 1.6.0 -> >= 1.7.0
- performance: >= 0.15.3 -> >= 0.16.0
- purrr: >= 1.2.0 -> >= 1.2.1
- rlang: >= 1.1.6 -> >= 1.1.7
- tidyr: >= 1.3.1 -> >= 1.3.2
- testthat: >= 3.3.0 -> >= 3.3.2

### GitHub Workflows
- Remove `r-version: "devel"` from check-no-warnings, html-5-check, pkgdown
- Update actions/setup-python from v6.1.0 to v6.2.0 in pre-commit
- Update test-coverage.yaml to display percentage and enforce 100% coverage

### Code Coverage
- Update codecov.yaml to enforce 100% coverage (target: 100%, threshold: 0%)

### Accessibility
- Add alt text to images in README.Rmd
- Add fig.alt attributes to all code chunks with figures

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: IndrajeetPatil

.github/copilot-instructions.md

@@ -0,0 +1,145 @@
+# Copilot Instructions for ggstatsplot
+
+## Package Overview
+
+`ggstatsplot` is an R package that creates `ggplot2`-based plots with statistical details included in the plots themselves. It serves as a visualization frontend for `statsExpressions`.
+
+## Architecture
+
+### Main Functions (R/)
+
+- **Visualization functions**: `ggbetweenstats()`, `ggwithinstats()`, `gghistostats()`, `ggdotplotstats()`, `ggscatterstats()`, `ggcorrmat()`, `ggpiestats()`, `ggbarstats()`, `ggcoefstats()`
+- **Grouped variants**: `grouped_ggbetweenstats()`, etc. - repeat same analysis across grouping variable
+- **Each function supports 4 types** via `type` parameter: `"parametric"`, `"nonparametric"`, `"robust"`, `"bayes"`
+- **Output**: All functions return ggplot objects with statistical annotations
+
+### Key Helper Functions
+
+- `extract_stats()`: Extract statistical details from a ggstatsplot object
+- `extract_subtitle()`: Extract expression from subtitle
+- `extract_caption()`: Extract expression from caption
+- `theme_ggstatsplot()`: Default theme for plots
+- `combine_plots()`: Combine multiple plots using patchwork
+
+### Dependencies
+
+Core: `ggplot2`, `statsExpressions`, tidyverse stack (`dplyr`, `purrr`, `tidyr`, `rlang`), `patchwork`, `paletteer`, easystats ecosystem (`insight`, `parameters`, `performance`, `datawizard`, `correlation`)
+
+## Developer Workflow
+
+### Common Commands (via Makefile)
+
+```bash
+make document     # Generate documentation (roxygen2)
+make build        # Build package tarball
+make check        # Run R CMD check
+make install      # Install package locally
+make lint         # Run lintr checks
+make format       # Format code with styler
+make install_deps # Install/update dependencies
+```
+
+### Testing
+
+- Framework: `testthat` (edition 3) with parallel execution
+- Run tests: `devtools::test()` or `make check`
+- **Snapshot tests**: Used for plot output verification via `vdiffr`
+- Test files mirror source files: `R/ggbetweenstats.R` -> `tests/testthat/test-ggbetweenstats.R`
+- Coverage requirement: **100%** (enforced by codecov)
+
+### Adding New Tests
+
+```r
+test_that("descriptive name", {
+  set.seed(123)
+  p <- function_under_test(data = dataset, x = var1, y = var2)
+  expect_s3_class(p, "ggplot")
+  vdiffr::expect_doppelganger("descriptive-name", p)
+})
+```
+
+## Code Conventions
+
+### Style
+
+- **Linting**: Uses `lintr::all_linters()` with exceptions in `.lintr`
+- **Formatting**: `styler::style_pkg()` (run via `make format`)
+- **Naming**: snake_case for functions and variables
+- **Pipes**: Use base R `|>` pipe (NOT magrittr `%>%`)
+
+### Roxygen Documentation
+
+- Uses `roxygen2` with markdown support (`Roxygen: list(markdown = TRUE)`)
+- Uses `@autoglobal` annotation from `roxyglobals` for global variables
+- Template files in `man-roxygen/` for shared documentation
+- Run `make document` after modifying roxygen comments
+
+### Function Parameters
+
+Common parameters across functions:
+
+- `data`: Input dataframe
+- `x`, `y`: Column names (unquoted, uses tidy evaluation)
+- `type`: One of `"parametric"`, `"nonparametric"`, `"robust"`, `"bayes"`
+- `paired`: Logical for paired/within-subjects designs
+- `results.subtitle`: Whether to show statistical results in subtitle
+- `centrality.plotting`: Whether to show centrality measure
+- `bf.message`: Whether to show Bayes factor message in caption
+- `ggtheme`: ggplot2 theme to use
+- `palette`, `package`: Color palette specifications
+
+## Important Patterns
+
+### Plot Construction
+
+Functions build plots layer by layer using ggplot2:
+
+```r
+ggplot(data, aes(x = x, y = y)) +
+  geom_violin() +
+  geom_boxplot() +
+  labs(subtitle = stats_expression, caption = bf_expression) +
+  theme_ggstatsplot()
+```
+
+### Statistical Analysis Delegation
+
+All statistical computations are delegated to `statsExpressions`:
+
+```r
+statsExpressions::two_sample_test(data, x, y, type = type)
+```
+
+### Grouped Functions
+
+Use `purrr::pmap()` to apply function across groups:
+
+```r
+purrr::pmap(list_of_args, ggbetweenstats) |>
+  patchwork::wrap_plots()
+```
+
+## Testing Tips
+
+- Set seeds before tests: `set.seed(123)`
+- Use `skip_if_not_installed()` for optional dependencies
+- Use `vdiffr::expect_doppelganger()` for visual regression tests
+- Use `suppressWarnings()` when tests intentionally trigger warnings
+
+## Files to Update Together
+
+When modifying a function:
+
+1. `R/<function>.R` - Source code
+2. `man/<function>.Rd` - Will auto-generate from roxygen
+3. `tests/testthat/test-<function>.R` - Tests
+4. `vignettes/web_only/<function>.Rmd` - Vignette (if exists)
+5. `NEWS.md` - Document user-facing changes
+
+## CI/CD
+
+- GitHub Actions workflows in `.github/workflows/`
+- Automated R CMD check on multiple platforms
+- Code coverage uploaded to Codecov (100% required)
+- Visual regression tests with vdiffr
+- Dependency updates via Dependabot

.github/workflows/check-no-warnings.yaml

@@ -18,7 +18,6 @@ jobs:
 
       - uses: r-lib/actions/setup-r@v2
         with:
-          r-version: "devel"
           use-public-rspm: true
 
       - uses: r-lib/actions/setup-r-dependencies@v2

.github/workflows/html-5-check.yaml

@@ -19,7 +19,6 @@ jobs:
 
       - uses: r-lib/actions/setup-r@v2
         with:
-          r-version: "devel"
           use-public-rspm: true
 
       - uses: r-lib/actions/setup-r-dependencies@v2

.github/workflows/pkgdown.yaml

@@ -28,7 +28,6 @@ jobs:
 
       - uses: r-lib/actions/setup-r@v2
         with:
-          r-version: "devel"
           use-public-rspm: true
 
       - uses: r-lib/actions/setup-r-dependencies@v2

.github/workflows/pre-commit.yaml

@@ -14,7 +14,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
 
-      - uses: actions/setup-python@v6.1.0
+      - uses: actions/setup-python@v6.2.0
         with:
           python-version: "3.13"
 

.github/workflows/test-coverage.yaml

@@ -31,5 +31,11 @@ jobs:
       - name: Test coverage
         run: |
           options(crayon.enabled = TRUE)
-          covr::codecov(quiet = FALSE)
+          cov <- covr::package_coverage()
+          pct <- covr::percent_coverage(cov)
+          cat(sprintf("\nCode coverage: %.2f%%\n", pct))
+          covr::codecov(coverage = cov, quiet = FALSE)
+          if (pct < 100) {
+            stop(sprintf("Code coverage is %.2f%%, which is below the required 100%%", pct))
+          }
         shell: Rscript {0}

DESCRIPTION

@@ -25,23 +25,23 @@ Depends:
 Imports:
     correlation (>= 0.8.8),
     datawizard (>= 1.3.0),
-    dplyr (>= 1.1.4),
+    dplyr (>= 1.2.0),
     ggcorrplot (>= 0.1.4.1),
-    ggplot2 (>= 4.0.1),
+    ggplot2 (>= 4.0.2),
     ggrepel (>= 0.9.6),
     ggside (>= 0.4.1),
     ggsignif (>= 0.6.4),
     glue (>= 1.8.0),
-    insight (>= 1.4.3),
+    insight (>= 1.4.6),
     magrittr (>= 2.0.4),
-    paletteer (>= 1.6.0),
+    paletteer (>= 1.7.0),
     parameters (>= 0.28.3),
     patchwork (>= 1.3.2),
-    performance (>= 0.15.3),
-    purrr (>= 1.2.0),
-    rlang (>= 1.1.6),
-    statsExpressions (>= 1.7.2),
-    tidyr (>= 1.3.1),
+    performance (>= 0.16.0),
+    purrr (>= 1.2.1),
+    rlang (>= 1.1.7),
+    statsExpressions (>= 1.7.3),
+    tidyr (>= 1.3.2),
     utils
 Suggests:
     afex,
@@ -59,13 +59,15 @@ Suggests:
     rstantools,
     stats,
     survival,
-    testthat (>= 3.3.0),
+    testthat (>= 3.3.2),
     tibble,
     vdiffr (>= 1.0.8),
     withr,
     WRS2
 VignetteBuilder: 
     knitr
+Remotes:
+    IndrajeetPatil/statsExpressions
 Config/Needs/check: anthonynorth/roxyglobals
 Config/roxyglobals/unique: TRUE
 Config/testthat/edition: 3