feat: polish offline history, book metadata, and live activities

[everpcpc]

What changed

• fixed offline reading history relative-time copy so the last-read timestamp includes direction semantics
• refined download and reader Live Activity layouts in Dynamic Island, including spacing, title handling, and duplicate progress readouts
• treated oneshot reader/download activities as single-title presentations
• showed completed books' last-read time in book cards and rows instead of repeating page-count metadata
• bumped the build number to 384

Why

These regressions were all presentation issues in the current UI layer:

• offline reading history used a relative fragment without the surrounding directional phrasing
• Dynamic Island expanded layouts were crowding the island edges and rendering redundant information
• oneshot content was still being rendered with a two-line series/book structure even when only one title should be shown
• completed book surfaces were still emphasizing page count instead of the more relevant last-read timestamp

Impact

• offline sync status reads more naturally
• reader/download Live Activities are cleaner and less cramped in Dynamic Island expanded mode
• oneshot titles render correctly as a single-title experience
• completed books show more useful recency metadata in browse surfaces

Validation

• make build-ios
• make build-macos