`CreateListModal.svelte` is the new entry point for "New list" — opens on the masthead button click, prefills the input with `currentCollective.default_list_title` (Fase 18.3.1), shows an inline autocomplete dropdown via `fetchTitleSuggestions`, and renders a "Sugerencia: Compra #6" chip when (a) the typed value exactly matches a catalog-curated prefix case-insensitively and (b) `computeNextNumber` resolves a value (Fase 18.3.2). Submit is disabled while the trimmed value is empty or creation is in flight (Fase 18.3.3). On submit, if the catalog match still holds, the modal auto-suffixes "#N" before inserting and the lists page shows a transient toast confirming the final name (Fase 18.3.4). The prefill effect is gated by a `wasOpen` edge-tracker — a naive `$effect(() => { if (open) value = default })` re-runs whenever `$currentCollective` updates (e.g. a realtime UPDATE landing after the user typed something), which clobbered the typed value and froze the submit button as disabled. The edge guard limits the prefill to the false→true transition. `/lists/+page.svelte`: the masthead "New list" button now opens the modal instead of calling `createList(collective, '', user)` and goto-ing to the detail page for inline rename. The legacy flow was nice for quick creates but couldn't enforce a required title or surface the catalog. Existing per-list actions are unchanged. 15 new i18n strings (en + es) for the modal, the suggestion chip, the auto-numbered toast, and the manage-page subsection that ships in the next commit. Updated existing e2e specs: `lists.test.ts`'s `createList()` helper + the C-13 guest path now drive the modal instead of the legacy placeholder input; `session.test.ts` S-03 uses the modal for the fresh-list setup. New `tests/e2e/list-title-flow.test.ts` adds LTF-01 (default prefill end-to-end with a Supabase-driven setDefaultListTitle since the manage UI lands in the next commit) and LTF-03 (empty input keeps submit disabled, even with whitespace). Tests: 4 lists + 3 session + 2 new LTF specs all green (9/9). Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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