[19.0] [MIG] calendar_export_ics

[tishmen]

Scope

• calendar_export_ics only

Summary

• Migrate to Odoo 19 using the working feature branch code.
• Context handling aligned with 19.0.
• Asset paths are relative under web.assets_backend.

Pre-commit

• Verified locally; no additional changes applied here to keep parity with the feature branch.

Tests
Command:

./odoo/odoo-bin -c odoo.conf -d odoo_calendar_tests_export_ics_001 \
  -i calendar_export_ics \
  --test-enable --test-tags "/calendar_export_ics" \
  --log-level=info --stop-after-init

Result: 3 tests green locally.

[tishmen]

Ready for review and merge. Migrated to 19.0 from the working feature branch, keeping changes minimal and aligned with repo standards. Pre-commit is green and tests pass locally.

Command:

./odoo/odoo-bin -c odoo.conf -d odoo_calendar_tests_export_ics_001 -i calendar_export_ics --test-enable --test-tags "/calendar_export_ics" --log-level=info --stop-after-init

cc @OCA/calendar-maintainers

[tishmen]

Superseded by #184 to preserve history. Closing in favor of the new PR.