Italian interface (it) #1293

We ship DeckCraft's web build in Aura (a self-hosted assistant, MIT), beside PdfCraft, WordCraft, PhotoCraft, FilmCraft and GridCraft. At their current releases all five have an Italian catalog. DeckCraft 0.10.0 is the one our Italian users see in English.

docs/localization-parity.md says the interface is English-only. It has no catalog yet, and it is tracked in #15, #30 and PR #34. Italian is among PowerPoint for Mac's 26 languages, but not among DeckCraft's twelve key languages.

Two questions:

1. Is the catalog in PR Add Ukrainian interface translation and language selection #34 the shape you mean to merge? That is crates/ui-egui/src/i18n.rs plus a TSV keyed by the English string. It is one commit on f448576, now 928 commits behind v0.10.0.
2. Once a catalog lands, would you take an it.tsv from us? We would write the translation, and an Italian speaker would review it.

On the web build the language would follow navigator.languages (#15), as PdfCraft 0.13.0's does.