Initial commit: year overview app for Google Calendar ICS feeds

Local Node app that fetches a Google Calendar ICS URL server-side (to avoid
browser CORS restrictions) and renders a two-year overview with each day
split into morning/afternoon/evening segments, colored by emoji found at
the start of event titles (configured in tags.json).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

test_days.js

@@ -0,0 +1,111 @@
+'use strict';
+const assert = require('node:assert/strict');
+const { buildOverview } = require('./days.js');
+
+const ICS = `BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//test//test//EN
+BEGIN:VEVENT
+UID:standup-1@test
+DTSTAMP:20260101T000000Z
+DTSTART;TZID=UTC:20260105T090000
+DTEND;TZID=UTC:20260105T093000
+SUMMARY:Standup
+RRULE:FREQ=WEEKLY;BYDAY=MO;COUNT=5
+EXDATE;TZID=UTC:20260119T090000
+END:VEVENT
+BEGIN:VEVENT
+UID:standup-1@test
+RECURRENCE-ID;TZID=UTC:20260126T090000
+DTSTAMP:20260101T000000Z
+DTSTART;TZID=UTC:20260127T140000
+DTEND;TZID=UTC:20260127T143000
+SUMMARY:Standup (moved)
+END:VEVENT
+BEGIN:VEVENT
+UID:trip-1@test
+DTSTAMP:20260101T000000Z
+DTSTART;VALUE=DATE:20260110
+DTEND;VALUE=DATE:20260112
+SUMMARY:💜 Weekend trip
+END:VEVENT
+BEGIN:VEVENT
+UID:flight-1@test
+DTSTAMP:20260101T000000Z
+DTSTART;TZID=UTC:20260106T100000
+DTEND;TZID=UTC:20260106T103000
+SUMMARY:✈️ Flight to Spain
+END:VEVENT
+BEGIN:VEVENT
+UID:party-1@test
+DTSTAMP:20260101T000000Z
+DTSTART;TZID=UTC:20260108T200000
+DTEND;TZID=UTC:20260108T220000
+SUMMARY:🎉 Party
+END:VEVENT
+BEGIN:VEVENT
+UID:combo-1@test
+DTSTAMP:20260101T000000Z
+DTSTART;TZID=UTC:20260115T090000
+DTEND;TZID=UTC:20260115T093000
+SUMMARY:✈️💜 Trip with Tessa
+END:VEVENT
+BEGIN:VEVENT
+UID:combo-2@test
+DTSTAMP:20260101T000000Z
+DTSTART;VALUE=DATE:20260122
+DTEND;VALUE=DATE:20260123
+SUMMARY:✈️ 💜 Madeira
+END:VEVENT
+END:VCALENDAR
+`;
+
+const tagsConfig = {
+  '💜': { label: 'Partner Tessa', color: 'magenta' },
+  '✈️': { label: 'Holidays', color: 'aqua' },
+};
+
+const overview = buildOverview(ICS, tagsConfig, '2026-01-01', '2026-01-31');
+
+// plain weekly recurrence: morning segment, untagged -> muted
+assert.deepEqual(overview['2026-01-05'].segments, ['muted', null, null]);
+assert.match(overview['2026-01-05'].tooltip, /09:00 Standup/);
+
+// EXDATE removes this occurrence entirely (nothing else touches this day)
+assert.equal(overview['2026-01-19'], undefined);
+
+// RECURRENCE-ID moved the Jan 26 occurrence away
+assert.equal(overview['2026-01-26'], undefined);
+
+// ...to Jan 27, 14:00 -> afternoon segment
+assert.deepEqual(overview['2026-01-27'].segments, [null, 'muted', null]);
+assert.match(overview['2026-01-27'].tooltip, /14:00 Standup \(moved\)/);
+
+// all-day multi-day event with a known leading emoji lights every segment, both spanned days
+assert.deepEqual(overview['2026-01-10'].segments, ['magenta', 'magenta', 'magenta']);
+assert.deepEqual(overview['2026-01-11'].segments, ['magenta', 'magenta', 'magenta']);
+assert.match(overview['2026-01-10'].tooltip, /All day 💜 Weekend trip/);
+
+// DTEND is exclusive: Jan 12 is NOT part of the trip, but it IS a Monday standup
+assert.deepEqual(overview['2026-01-12'].segments, ['muted', null, null]);
+
+// leading emoji that IS in tagsConfig takes that entry's color, not re-prefixed in tooltip
+assert.deepEqual(overview['2026-01-06'].segments, ['aqua', null, null]);
+assert.equal(overview['2026-01-06'].tooltip, '10:00 ✈️ Flight to Spain');
+
+// leading emoji NOT in tagsConfig still stands out (not muted) via the fallback color
+assert.deepEqual(overview['2026-01-08'].segments, [null, null, 'blue']);
+assert.equal(overview['2026-01-08'].tooltip, '20:00 🎉 Party');
+
+// two consecutive leading emoji (no space between) split the segment into both colors
+assert.deepEqual(overview['2026-01-15'].segments, [['aqua', 'magenta'], null, null]);
+assert.equal(overview['2026-01-15'].tooltip, '09:00 ✈️💜 Trip with Tessa');
+// single-emoji case (Jan 6, asserted above) still resolves to a plain string, not an array —
+// the split path only triggers for a genuine two-emoji run.
+assert.equal(Array.isArray(overview['2026-01-06'].segments[0]), false);
+
+// two leading emoji WITH a space between them (how this calendar actually types combos) still split
+assert.deepEqual(overview['2026-01-22'].segments, [['aqua', 'magenta'], ['aqua', 'magenta'], ['aqua', 'magenta']]);
+assert.equal(overview['2026-01-22'].tooltip, 'All day ✈️ 💜 Madeira');
+
+console.log('all assertions passed');