FM-SYNCCAL-IMPORT-SCROLL: scroll the import banner's calendar list (closes #27)

[keyxmakerx]

Hot fix — operator can't reach calendars below the fold

FM-SYNCCAL-ROOT-FIX (#47) shipped and the Sync Calendar app now opens cleanly. The empty-state import banner correctly enumerates Calendaria's full library (operator's screenshot shows Athasian, Barovian, Cerilian, Drakkenheim, Exandrian, Forbidden Lands, Galifar, Golarion, … 8+ rows). Bug #25 closed by symptom — it was a downstream effect of #26's crash, not its own bug.

New #27 surface: the calendar list overflows the modal but doesn't scroll. Operator can see ~8 calendars; the rest are clipped without a scrollbar. Closes BACKLOG #27.

Root cause

.sync-calendar .import-calendar-list had no max-height and no overflow-y. Its parent .sync-calendar-degraded is height: 100% + justify-content: center, so when the list outgrows the container the content clips top + bottom rather than rendering a scrollbar.

Fix (1 commit, CSS-only)

Two scoped rules in styles/sync-calendar-pr3.css:

1. .sync-calendar .import-calendar-list — added max-height: 50vh; overflow-y: auto;. The list now scrolls on its own when it outgrows half the viewport. Header (NO CALENDAR IN CHRONICLE YET — IMPORT FROM CALENDARIA) + hint paragraph + Recheck button stay pinned above; only the calendar rows themselves scroll.
2. .sync-calendar-degraded:has(.import-banner) — added justify-content: flex-start; (optional polish from the dispatch). When the import banner is present, top-align so the heading lands at a predictable position instead of getting clipped at the top from being vertically centered. Bare degraded state (no banner) keeps the base centered layout via the original rule.

Net delta: +14 lines including comments. No JS, no template, no i18n changes.

Visual smoke test (per dispatch acceptance)

1. Degraded mode, 0 Calendaria calendars — NoCalendariaCalendars message renders inline; no scrollbar appears (overflow-y: auto only shows the bar when content overflows).
2. Degraded mode, 1–3 calendars — list renders compactly; no scrollbar.
3. Degraded mode, 8+ calendars (operator's repro) — list scrolls within itself; heading + hint + Recheck button stay visible above.
4. Resize narrower / shorter — 50vh adapts with the viewport; the cap follows the modal's available height.

Tests

234 / 234 pass (CSS-only change, no test impact). Run: node --test tools/test-*.mjs

Out of scope (per dispatch)

• ❌ Banner redesign
• ❌ Search/filter UI for the calendar list (future if the library balloons further)
• ❌ Sync Calendar discoverability fix (still in BACKLOG)

After merge

This unblocks the end-to-end Calendaria → Chronicle import round-trip test. Once operator confirms they can scroll the full list and pick any calendar, the full 6-PR calendar epic chain (chronicle#316/#319/#320/#321/#322/#323 + chronicle-foundry-module#43/#44/#45/#46/#47) gets its first real smoke test.

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