feat: Support configurable priority colors#814
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Improve accessibility and UX by giving administrators an option to configure the colors used for issue priorities on the dashboard. This allows admins to choose colors according to their issue priority order and the need of their team members. Furthermore, enhance accessibility by giving overdue issues a distinct shape too, not only color. This ensures that users with color vision deficiencies can easily identify overdue issues on the dashboard. The colors can be chosen from a palette of 10 colors with 5 shades each, so that themes can adjust these colors e.g. for dark mode, high contrast, or matching the theme better. All colors are defined as CSS variables, and chosen based on a oklch color palette for visual distinction. Note: This is first feature that heavily patches into Redmine's core and requires a database migration. This will need some serious testing and feedback to ensure it works well across different Redmine versions and setups, including other plugins. Closes #802
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This PR adds two improvements for accessibility and UX:
Color customization for issue priority indicator
An administrator can choose a color from a palette for 65 color shades, for example, to change colors due to a different issue priority order or the preferences of the team members.
I've implemented a color palatte approach, vs. a free color input, so that the theme can define the colors and shades, and adjust them to the needs of the theme, for example, a dark theme, high contrast, or to better match the overall theme coloring.
The palette is implemented using CSS variables using visually distinctive oklch-based color and shade schemes. The text and background colors have been checked for WCAG color contrast compliance.
Distinct overdue shape
OVerdue tickets are no longer marked by color only, but have a distinct outline shape now too. This eases identifying overdue issues independently of the color.
Examples
Note: This is first feature that heavily patches into Redmine's core and requires a database migration. It might interfere with other plugins patching enumerations too, since ther is no hook to extend that view (yet).
When upgrading, remember to migrate the database:
Closes #802