fix(reader): read position from the API at open; never write a restored position

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The reader page embedded a snapshot of reading state (position,
bookmarks) server-side at render time. Browsers may reuse that HTML
(heuristic caching, bfcache), so opening a book could restore a stale
position — and worse, the restore's relocate auto-saved it back,
overwriting a newer device push minutes later. A KOReader sync followed
by opening the web reader would silently revert the row to the old web
position; the row's source and the rendered page disagreed.

The web reader is intrinsically tied to the server, so it has no business
preserving reading state client-side:

- The rendered page now carries only immutable book metadata. The reader
  fetches progress fresh (cache: no-store) from the existing progress
  API at open and restores with the same priority as before (page for
  fixed-layout, CFI, percentage, fresh start); a failed fetch opens at
  the start and writes nothing. Initial bookmarks likewise come from
  their endpoint instead of the embed; annotations already did.
- Progress saves are gated on deliberate navigation only (page turns,
  keys, slider, search/TOC/bookmark/back-stack jumps, tap zones — each
  marks the session as user-moved). Restores and section-load
  relocations never write, so displaying a position can no longer
  clobber a newer one. A bfcache-resurrected page resets the flag and
  cannot write its frozen position either. This replaces the old
  five-second post-init suppression, which a stale page bypassed.
- The server-rendered initial progress badges render a neutral
  placeholder until the first relocate fills them (sub-second).

No API, schema, or sync-engine changes. Normal reading saves exactly as
before — the first save now simply waits for the first real page turn.

...

This commit is contained in:

john-okeefe

2026-09-09 14:52:30 -04:00

parent 75c1d9bb95

commit ce3ae31ced

4 changed files with 130 additions and 272 deletions

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templates/reader_templ.go

+39 -128

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