Backport bug fixes from NemesisHubris/litfinder (addresses #999, #956, #1010, #1021, #1025, #1040)

[spin-drift]

Backport bug fixes from NemesisHubris/litfinder

Forwards a curated set of bug fixes from NemesisHubris/litfinder — a community fork of this project — that address open issues here. All commits preserve original authorship via git cherry-pick; this PR is a backport rather than original work. Each fix has been reviewed locally, lint/format-cleaned to match this repo's existing ruff config, and verified with the test suite. Rebrand strings, license switches, and features have been deliberately excluded.

Upstream issues addressed

• [BUG] Mirror URLs with query params break search requests #999 — Mirror URLs with query params no longer break search requests (strip query string/fragment in normalize_http_url)
• [BUG] Proxy settings ignored for notifications #956 — Apprise notifications now respect the configured proxy (proxy env vars injected before dispatch)
• [BUG] No setting to set audiobook torrent label #1025 — rTorrent: separate RTORRENT_AUDIOBOOK_LABEL setting, falls back to book label if unset
• [BUG] Clicking the red Stop square in Activity causes screen to disappear #1010 — Stop button in Activity no longer makes the panel disappear (snapshot refresh on cancel)
• [BUG] Tor loops on 1.3.0 #1021 — Anna's Archive slow-download countdown now caps retries instead of looping forever
• [BUG] Empty Folder with broken permissions #1040 — Empty destination directory cleaned up when write probe fails
• PR Added language detection throught the distant path of AA. #1031 — Language detection from Anna's Archive distant path when listing metadata is missing

Additional fixes (no open issue but clear bugs)

• fix: Python 2 except syntax across 27 files — except X, Y: is a SyntaxError in Python 3 and prevents affected modules from importing at runtime. Mechanical sweep to except (X, Y):.
• fix(abb): info hash validation with magnet fallback — adds SHA-1/SHA-256 hex validation on extracted info hashes; falls back to scanning the full page for a magnet link (e.g. posted in comments) when the table value is malformed. Also extends the exact-phrase fallback to manual queries and defaults the ABB listing language to en when missing, preventing valid results from being hidden by the language filter. Includes a small test-fixture fix (test(abb): use valid hex info hashes in scraper test fixtures) since the existing fixtures used non-hex placeholders that the new validation correctly rejects.
• fix: Anna's Archive title parser — handles nested edition spans and filters lgli catalog descriptor entries (e.g. "Book/Online Audio") that were polluting search results.

Deliberately not included

• LitFinder rebranding (UI strings, Apprise app ID, logo). The fix: three upstream bugs commit ([BUG] Mirror URLs with query params break search requests #999/[BUG] Proxy settings ignored for notifications #956/[BUG] No setting to set audiobook torrent label #1025) was cherry-picked with Apprise app-id, description, and logo-URL strings reverted from "LitFinder" back to "Shelfmark"; noted in the commit body.
• Features from the LitFinder fork (multi-variant title search, multi-book flat-folder grouping, fuzzy text matching, "Leave in Place" output handler, admin display name, custom-source plugin system). These are larger behavior changes that each warrant their own focused review — happy to send any of them separately if of interest.
• LitFinder-specific test environment and CI infrastructure.

Verification

• Backend: 1879 passed, 96 skipped (1 preexisting failure on seleniumbase-dependent test in local venv; runs fine in the standard Docker image with the browser extra)
• Lint, format, dead-code: all clean against this repo's existing ruff/vulture config
• One follow-up cleanup commit (style: ruff lint and format fixes for ported commits) brings the cherry-picked code into compliance with this repo's ruff settings — no behavior changes there

Etiquette / credit

Per-commit authorship preserved by cherry-pick. The only edits to the original commits are:

• fix: three upstream bugs — Apprise rebrand strings reverted to "Shelfmark" (noted in commit body, original author retained as Co-Authored-By via cherry-pick)
• One follow-up style: commit for ruff config alignment

Big thanks to @NemesisHubris for the original work in LitFinder; this PR exists to make sure these fixes reach Shelfmark's wider user base. Happy to revise scope, split into smaller PRs, or split off the Py2 cleanup separately if that's preferable.

[calibrain]

Thank you so much for the contribution !
Great work on the backport !