feat(history): share one HistoryList across desktop and mobile

The desktop /profile/history page and the mobile Library "History" tab
each hand-rendered reading history with separate markup, which had drifted:
the Library tab was a read-only 2-column list with no date and no
removed-chapter / whole-manga fallbacks, while /profile/history was a
3-column list with a per-row clear button. Extract a shared HistoryList
component so the two can't diverge again.

- New HistoryList.svelte owns row rendering, the optimistic-removal UX
  (instant remove, rollback + inline error on failure), and the empty
  state. Clear is opt-in via an `onClear` prop so a caller can render
  read-only, but both surfaces now pass it.
- The mobile Library History tab gains the clear action, the "Read {date}"
  line, and the (chapter removed) / whole-manga fallbacks it was missing.
- Continue label is built in script (was inline) so the " — page N" suffix
  keeps its spaces — Svelte trimmed them at the {#if} edge, rendering
  "Chapter 3— page 7". Both surfaces now read "Continue Chapter N".

Net -204 lines across the two pages. Uploads parity on the mobile tab is
left as a follow-up (it needs the library loader to fetch uploads).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

backend/Cargo.lock

@@ -1517,7 +1517,7 @@ checksum = "c41e0c4fef86961ac6d6f8a82609f55f31b05e4fce149ac5710e439df7619ba4"
 
 [[package]]
 name = "mangalord"
-version = "0.88.0"
+version = "0.89.0"
 dependencies = [
  "anyhow",
  "argon2",

backend/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mangalord"
-version = "0.88.0"
+version = "0.89.0"
 edition = "2021"
 default-run = "mangalord"