Roadmap: Release a stable version of Calendar 8.x-1.x

Problem/Motivation

The 8.x-1.x branch is missing several key features and fixes that existed in the D7
version. To prepare for a stable release, these features need to be restored or
modernized, outdated settings removed, and regression coverage expanded to ensure
parity and reliability for Drupal 10+.

Proposed resolution

• Port session default-date handling so track_date works; add regression coverage for contextual filter defaults.
• Rebuild Views templates to restore mini block, upcoming list, and optional iCal feed, documenting configuration and dependencies.
• Remove obsolete Colorbox and “provide templates” settings; clean up admin form and config schema.
• Remove unused OG-based colouring options; prune config defaults and related UI.
• Repair week display structure and CSS; add PHPUnit tests for week display rendering and overlapping events.
• Reintroduce hyphenated contextual arguments and granularity guessing to match legacy Date URLs.
• Expand test suite to cover legend block logic and rendering.
• Evaluate action-link workflow (row option, local tasks, node links) before implementation.
• Add Smart Date integration for templates, row processing, and tests.