fix: ics calendar export dates (#535)

* feat: academicCalendars object

* feat: seemingly working start, end, and until dates

* feat: seemingly working everything

* style: removed unnecessary deps, reorganized code

* style: code comments yay

* chore: old version of pnpm?

* ci: force github actions to rerun

* feat: list instructors in ics string, basic tests

* feat: testable code for ICS, tests for ICS, filter excluded dates

* style: eslint autofix

* test: check for graceful handling of errors in ICS

* fix: actually use scheduleToIcsString

* chore: eslint didn't include a space where it should've

* fix: ensure tz everywhere

* refactor: move string util to string util file

* feat: em dash in calendar event title

* feat: academic calendars 22-23 and 23-24

* fix: en dash instead of em dash

package.json

@@ -27,6 +27,7 @@
         "prepare": "husky"
     },
     "dependencies": {
+        "@date-fns/tz": "^1.2.0",
         "@dnd-kit/core": "^6.3.1",
         "@dnd-kit/modifiers": "^9.0.0",
         "@dnd-kit/sortable": "^10.0.0",
@@ -40,6 +41,7 @@
         "chrome-extension-toolkit": "^0.0.54",
         "clsx": "^2.1.1",
         "conventional-changelog": "^6.0.0",
+        "date-fns": "^4.1.0",
         "highcharts": "^11.4.8",
         "highcharts-react-official": "^3.2.1",
         "html-to-image": "^1.11.13",