fix(frontend): RFC 5545-correct calendar export with tests (#65)

[sandrawillow001-afk]

Coordination note. Issue #65 is currently assigned to @Paulotoide. This PR implements the same subject matter; please coordinate with them before merging so the effort is not duplicated.

Closes #65.

What already existed

The feature was largely present: lib/generateICS.ts, an Add to Calendar button, milestone dates and .ics download — so three of the four acceptance criteria were met. Re-checking the implementation turned up real defects and zero tests.

Defects fixed

1. allDay was silently ignored. The localized page passed allDay: true, but ICSEvent had no such field, so the intent was dropped and the event was serialised as a timed event.
2. TEXT values were never escaped. A title such as Redesign, phase 2 produced SUMMARY:Redesign, phase 2, which most clients truncate at the comma. Now escaped per RFC 5545 §3.3.11 (\, ;, ,, newlines).
3. No line folding. Long descriptions exceeded the 75-octet limit (RFC 5545 §3.1). Now folded with CRLF + space, without splitting UTF-8 sequences.
4. Invalid dates produced unparseable output. A bad deadline emitted DTSTART:NaNundefinedZ, corrupting the whole calendar. Such events are now skipped.
5. The two project pages had drifted. They used different UIDs and descriptions for the same milestone. Both now call one shared builder, and UIDs stay stable so re-imports update rather than duplicate.

Acceptance criteria

• Include project deadlines — Project now exposes the on-chain deadline (via formatProjectData), and a dedicated deadline event is emitted.
• Include milestone dates — one event per milestone due date.
• The deadline event is skipped when a milestone already falls on that same UTC day, because the contract currently maps the deadline onto a single milestone; this keeps the calendar duplicate-free.

Verification

cd frontend
npx vitest run lib/__tests__          # generateICS 26 + project-calendar 17 passed
npx tsc --noEmit | grep -cE 'generateICS|project-calendar|projects/\[id\]|lib/types|useAgenticPay'  # 0
npx eslint lib/generateICS.ts lib/project-calendar.ts lib/__tests__  # clean

lib/api.test.ts (2 tests) fails both before and after this change — pre-existing and unrelated.

Note

Changing the non-localized page's UIDs to the shared scheme means events previously added from that page will appear once more if re-added; the two pages now agree, which is the point.

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