feat(calendar): unit calendar and iCal feeds

[Clupai8o0]

What this is

Extends the existing WebCal feed. A student can opt in to having their unit sessions, such as HelpHubs and classes with join links, in the same calendar as their task dates.

What is in it

• app/models/webcal.rb adds published learning sessions for enrolled, active units when include_learning_sessions is on. It uses UnitLearningSession from the Unit Hub PR.
• Task events now use each task's effective deadline date.
• webcal_api.rb and webcal_entity.rb accept and return the new include_learning_sessions option.
• The feed refresh hint changes from 1D to PT4H.
• webcal_public_api.rb sends Cache-Control: private, no-store on the public feed.
• Tests in test/api/webcal_api_test.rb and the calendar model tests.

How this set of PRs works

This is one of 24 PRs from the Thoth Tech T2 2026 Features team (9 api, 14 web, 1 deploy), one per feature per repo. Each one carries that feature's files, taken from our team org's 11.0.x branch, and applied straight onto thoth-tech 11.0.x. Every file is in exactly one PR. Some files are shared between features, so a PR on its own may not build. The demo PR in each repo (api #127, web doubtfire-lms#544) is imported by earlier PRs too, so it has to go in with the rest, not be dropped. Merged in the order below, the set equals our org 11.0.x minus team docs, evidence files, org-only CI and dev setup files. No app code or tests are left out.

On 28 Sep 2026 the set was brought up to our org's latest merges (api ontrack-features-t2-2026#178, web ontrack-features-t2-2026/doubtfire-web#281 and ontrack-features-t2-2026/doubtfire-web#282, deploy ontrack-features-t2-2026/doubtfire-deploy#41). Most PRs got one more commit for that. Two web PRs are new, panels (thoth-tech/doubtfire-web#546) and celebrate (thoth-tech/doubtfire-web#547), for files that were in no PR before.

Merge order, api first, then web, then deploy. In web, panels goes before the pages that use it, and celebrate goes after a11y, whose confetti service it needs.

• api: chore: T2 2026 platform, CI and dependency updates #119 platform, fix(security): T2 2026 permission and security fixes #120 security, fix: T2 2026 task, comment and user fixes #121 core, feat(notifications): in-app, email and push notifications #122 notifications, feat(submissions): submission processing, DOCX feedback and upload rules #123 submissions, feat(unit-hub): unit hub and Teams sync #124 unit-hub, feat(calendar): unit calendar and iCal feeds #125 calendar, feat(ppi): peer progress and cross-unit dashboard #126 ppi-cpd, feat(demo): demo scenarios and sample data tasks #127 demo
• web: chore: T2 2026 platform, CI and dependency updates doubtfire-web#534 platform, fix(security): T2 2026 permission and security fixes doubtfire-web#535 security, feat(panels): shared collapsible and resizable panel layout doubtfire-web#546 panels, feat(theme): theme foundation and dark mode doubtfire-web#536 theme, fix(a11y): accessibility fixes doubtfire-web#543 a11y, feat(celebrate): submission, sign-off and portfolio confirmations doubtfire-web#547 celebrate, feat(ui): shared UI wiring, layout fixes and Angular moves doubtfire-web#537 ui, feat(notifications): in-app, email and push notifications doubtfire-web#538 notifications, feat(submissions): submission processing, DOCX feedback and upload rules doubtfire-web#539 submissions, feat(unit-hub): unit hub and Teams sync doubtfire-web#540 unit-hub, feat(calendar): unit calendar and iCal feeds doubtfire-web#541 calendar, feat(ppi): peer progress and cross-unit dashboard doubtfire-web#542 ppi-cpd, feat(demo): demo mode and demo tools doubtfire-web#544 demo, feat(theme): page redesign and dark mode for every page doubtfire-web#545 redesign
• deploy: chore(deploy): T2 2026 deploy and dev stack updates doubtfire-deploy#43 deploy

Built against

• api: thoth-tech 11.0.x @ dc76a5a0e, taken from org 11.0.x @ a9589b302
• web: thoth-tech 11.0.x @ 20d1f380c, taken from org 11.0.x @ 0b8a20344
• deploy: thoth-tech 11.0.x @ 58905969e, taken from org 11.0.x @ 8e560f7e0

Testing

Checked on 28 Sep 2026 with all the branches merged together. This PR was not tested on its own, see above.

• web: with all 14 web branches merged onto thoth-tech 11.0.x, npm run test:ci runs 2603 tests in 290 files, all passing, and npm run lint and ng build pass. The merged set's app code is the same as our org 11.0.x after fix(profile): save a changed summary email cadence ontrack-features-t2-2026/doubtfire-web#282, where CI passed test, lint (22) and build (22).
• api: the full Minitest suite passes on the nine api PRs merged onto thoth-tech 11.0.x. 1799 tests, 20182 assertions, 0 failures, 0 errors, 0 skips. It ran through our CI on branch check/upstream-combined-28sep (run), and the database schema check and RuboCop pass there too. The set differs from our org 11.0.x only by the left-out docs, evidence, CI and dev setup files, none of them app code.
• deploy: production/tests/validate_test.sh, verify_pwa_test.py, publish_release_test.py and nginx_upload_test.py pass. The production compose file loads with docker compose config against .env.production.example, and the development and .devcontainer ones load as they are.

Contributors

Samridh Limbu, Maple Fox, dylancleal, blankb0t