Add live duplicate check to the new-entry dialog

[myieye]

Searches existing entries as you type in the new-entry dialog and surfaces likely duplicates before you save.

Resolves #1752. Supersedes #2411 (same feature, this branch = #2411 + latest develop + review fixes below; the review didn't change the feature's direction, UI, or architecture).

What it does

• duplicate-check.ts — debounced multi-field search (headword/citation/gloss) via the existing FTS searchEntries; results classified as same word / similar word / similar meaning and ranked strongest-first. Cross-field coincidences (a typed vernacular value that only hit a gloss, or vice versa) are dropped as noise. Classification mirrors the backend match semantics — every parity claim in the file's comments was re-verified against the actual backend code this round (invariant case fold + diacritics significant only when typed, EntrySearchService.StripMorphTokens exact mirror incl. scoring and the postfix-length guard, FwData's no-strip behavior, the <3-char FTS fallback). Collation equivalences (ß≈ss, ligatures, ICU-ignorables) are not replicated, as documented in the file.
• DuplicateCheck.svelte — collapsible strip in NewEntryDialog.svelte (amber when the word already exists); auto-expands on an exact word match; rows expand in place for "Add sense" / "Go to entry"; "Show N more" for long lists; quiet green "Looks like a new word" when nothing matches.
• DuplicateSummaryPill.svelte — sticky pill shown when the strip scrolls out of view; click jumps back and expands; dismissible.
• Per-row rescue: add the typed sense to the existing entry instead of creating a duplicate (only the meaning is saved — the word already exists).
• Keyboard: Enter inside the duplicate UI never submits the dialog; double-Enter can no longer double-create (pre-existing race, fixed in passing).
• No backend changes.

Changes since #2411

1. Merged latest develop, absorbing the E2e test fw lite #1866 E2E-test restructure: the feature's Playwright suite moved to tests/ui/ and now uses the new DemoProjectPage page object (the old BrowsePage it imported was deleted on develop — Add live duplicate check to the new-entry dialog #2411 as-is no longer runs its tests).
2. Jump pill capped at 32rem — with a long headword preview it stretched across the whole (up to 50rem) dialog. Truncation + the "N+" badge take over past the cap:
   
3. Search failures are no longer silent. duplicatesResource.error was never read: a failed searchEntries (e.g. connection loss on a server-hosted session) made the widget silently go blank. Now an inline status line says "Could not check for similar entries"; typing again retries. Deliberately not an AppNotification.error toast (the EditEntryDialog/ActivityView precedent): this search re-fires on every typing pause, and a toast per failure would bury the dialog — the strip already owns a status line.
4. "Show N more..." uses $plural so translators get per-language plural forms (matches the SyncDialog convention).
5. New tests for previously uncovered behavior at the heart of the feature's promise: trapEnter unit test; Enter pressed inside the strip expands the row and does not create the entry (asserted via entry count); add-sense asserts no duplicate entry was created alongside the rescued sense; pill dismissal persists while matches keep changing.
6. i18n re-extracted with translator context comments for the new strings.

The CodeRabbit race on #2411 (go-to-entry clickable during a pending add-sense) was already fixed there in ad8bfa5 — re-verified here: both row actions disable on busy, and the dialog's Create honors it.

Screenshots

Exact match (amber strip, auto-expanded, light/dark verified):

Row expanded in place with rescue actions:

Jump pill when the strip is out of view (now width-capped):

New word / similar-only (collapsed, muted):

Dark mode spot-checks: exact match · row actions

(Screenshots were committed in d267bd1 and reverted in the next commit, so they don't live on the branch.)

Test evidence

• vitest --project unit duplicate-check.test.ts: 34/34 pass
• playwright -c tests/ui new-entry-duplicates: 9/9 pass (7 ported + 2 new)
• svelte-check: 0 errors / 0 warnings; eslint on all touched files: clean
• i18n extraction re-run; catalogs consistent across all 8 locales, no duplicate msgids after the develop merge

Reviewer notes / merge interactions

• Add variant support to FwLite (backend + viewer UI) #2410 (variants) also touches DictionaryEntry.svelte; this PR adds the inline prop there. Whoever merges second gets a small conflict in the props block + sense-separator markup — keep both changes.
• Display pictures in senses #2412 (pictures) touches all src/locales/*.po → guaranteed extraction conflicts. Resolution: take either side, re-run pnpm run i18n:extract, commit.
• The demo/in-memory API ignores SortField.SearchRelevance (sorts alphabetically) — the UI tests exercise classification, not backend ranking. Real ranking is covered by the backend's own tests.
• Deferred follow-ups: Storybook stories for the two new components (Playwright covers behavior); collation-level fold equivalences if the backend fold ever changes (documented in duplicate-check.ts).

Considered and rejected (carried over from #2411)

• Wizard-style duplicate step — adds a click to the common no-duplicate case
• Post-submit interstitial — warns only after the duplicate is typed in full; inline is cheaper to act on
• Combobox under the headword field — ties the check to one field; duplicates can hide in citation form or gloss

🤖 Generated with Claude Code

https://claude.ai/code/session_01R49zrCE7hPgm9QJ5bfugaV

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Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No changes detected	-	Jul 12, 2026, 10:12 AM
e2e (Inspect)	⚠️ Changes detected (Review)	5 changed	Jul 12, 2026, 10:19 AM