Phase 5b slice C. Mirror of slice B for the timeline cache:
timelineCache + cachedTimeline + newTimelineCache deleted. The Server's
timeline field is now `*cache.TTLCache[*TimelinePayload]` constructed
via `cache.NewTTL[*TimelinePayload](timelineCacheTTL)`. Call sites
across web/{timeline,caldav,dashboard,links}.go renamed:
- s.timeline.get(k) → s.timeline.Get(k)
- s.timeline.set(k, p) → s.timeline.Set(k, p)
- s.timeline.invalidateAll → s.timeline.InvalidateAll
- (timeline never used keyed invalidate, so no .Invalidate rename)
Removes the unused `sync` import from web/timeline.go. The 50-line
timelineCache struct + four methods are gone; the file shrinks by
~50 lines.
All web/timeline_*test.go pass unmodified.
Task: t-projax-5b-cache
mAi
d518978edb