feat(ratings): "Didn't use it" feedback in the rating UI [Rating page for assets (My Downloads)]

[PetrDlouhy]

What

The My downloads page's "I didn't use this asset" feedback, now in the add-on: a "Didn't use it" dropdown at the bottom of every ratings UI (fast-rate popup, sidebar ratings panel, asset detail card). Server API: Blendkit-server#3674; Client proxy: bk_client#49 (submodule bumped to that commit).

• One menu for every state — pick a reason to flag (the server's shared admin-managed choice set, fetched once per session), the current reason wears a checkmark, "Undo" lives at the bottom.
• Mutual exclusivity, drawn not explained — a rated asset's menu warns "This replaces your rating"; the pick deletes the scores server-side (replace_rating) and remembers them session-locally. The hint over the now-disabled rating rows names the numbers ("Your 8★ / 4 h rating was cleared - Undo restores it") and "Undo - restore my rating" re-rates, which also drops the flag server-side (rating wins). Rating a flagged asset clears the flag; the local store mirrors it.
• Errors land where the eyes are — server refusals ("Only downloaded assets can be flagged.") show as red text inline under the control instead of only the corner report overlay; the server's detail sentence is extracted even from a Client that passes the raw JSON body through.
• Bugfix: handle_get_rating_task skips unknown rating types (historic competition-2022-votes / nodevember-votes) instead of crashing the task-handling timer — hit on devel with a validator account.

Testing

tests/test_didnt_use.py (23 tests): task handlers, dispatch routing, operator flows (flag/undo/replace/restore, partial memory), inline-error extraction incl. the raw-JSON regression, and the unknown-rating-type crash reproduction. Full suite in headless Blender 5.2: 513 tests pass (one pre-existing test_init bl_info failure exists on clean main in local extension-mode runs). Exercised manually end-to-end against devel.

Release note

Real users need a bk_client release + client version pin bump after bk_client#49 merges; dev builds (--client-source local) work as-is.

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