fix(calendar): hash calendar IDs in the events cache key (1.2.12)

[ChuckBuilds]

Problem

On hdpi the calendar logs this warning on every update:

WARNING - src.cache_manager - Could not create temp file in /var/cache/ledmatrix, using direct write for calendar_events_<email>_en.usa#holiday@group.v.calendar.google.com_family...@group.calendar.google.com_ncaaf_-m-07kbp5_%47eorgia+%42ulldogs+football#sports@...
WARNING - src.cache_manager - Direct write failed ...
WARNING - src.cache_manager - Could not write cache ...

The events cache key was calendar_events_ + every selected calendar ID joined with _, and the cache manager uses the key as the filename. With five calendars, including Google's long holiday and sports calendar IDs, the name is longer than the 255-byte filename limit. Every write fails, so the events are never cached and the plugin asks Google for them again on every update.

Fix

The key is now calendar_events_ + the first 16 hex characters of a sha256 of the sorted calendar IDs (manager.py). It's still unique per set of calendars and stays the same length however many calendars are selected.

Version 1.2.11 → 1.2.12 (patch), with a new versions[0] entry. plugins.json was regenerated with update_registry.py. Core floor is unchanged.

Testing

• All 3 calendar tests pass: test_display_does_not_blank_the_panel, test_no_interactive_auth, test_without_google_libraries.
• check_version_bump.py --base main calendar: PASS (1.2.11 → 1.2.12).
• update_registry.py --check: PASS.
• Not yet checked on hdpi. It still runs calendar 1.2.9, so the warning stays until the update is installed there.

🤖 Generated with Claude Code

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