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user1823 1f51c40a05 feat: expose explicit fsrsEnabled in card stats (#5660 )

## Linked issue (required)

Fixes https://github.com/ankitects/anki/issues/5285
- Follow up to https://github.com/ankitects/anki/pull/5277

Also allows forgetting curve to appear when the memory states are
absent.

## Summary / motivation (required)

The frontend was inferring FSRS state from indirect signals such as
memoryState or desiredRetention. This can be incorrect and it's better
to rely on the actual bool from the Rust backend instead.

## Steps to reproduce (required, use N/A if not applicable)

1. Have a card with no memory states and no desired retention but FSRS
enabled (e.g. by setting "Ignore reviews before" to a date later than
its latest review)
2. Open card info
3. Ease is shown and forgetting curve is not shown.

## How to test (required)

On repeating the above steps,
- ease is not shown
- forgetting curve is shown (to show the forgetting curve, you need to
follow the steps with a memory-state-less card from an earlier Anki
version by changing deck. If you set "ignore reviews before" to a later
date, there will be no forgetting curve)

### Checklist (minimum)

- [x] I ran `./ninja check` or an equivalent relevant check locally.
- [x] I added or updated tests when the change is non-trivial or
behavior changed.

### Details

One test is removed because it's not possible to have memory states with
FSRS disabled.

## Before / after behavior (optional)

<!-- For bugfixes: behavior before vs after. For other types: N/A or a
short note. -->

## Risk / compatibility / migration (optional)

<!-- Breaking changes, rollout notes, or N/A for small / low-risk PRs
-->

## UI evidence (required for visual changes; otherwise N/A)

<!-- Screenshot or short video -->

## Scope

- [x] This PR is focused on one change (no unrelated edits).

2026-09-25 17:39:43 +01:00