4K support in video downloads

Purpose

Add 4K (2160p) and 2K (1440p) as selectable download quality tiers, and update marketing copy that currently caps the advertised resolution at 1080p.

Context

The download pipeline already resolves quality generically:

src/lib/ytdlp-options.ts exports QUALITIES, a fixed list consumed by the probe (src/lib/ytdlp-probe.ts) to compute which qualities are actually available for a given source video (filtered against the max height yt-dlp reports), and by the UI (src/components/SubmitForm.tsx, via capabilities.availableQualities) to render the quality <select>.
src/lib/ytdlp.ts (buildYtdlpArgs) turns the selected quality string into a yt-dlp format selector via height<=?${quality.replace('p', '')}, with no hardcoded ceiling.

Because both the filtering and the format-selector logic are already generic over the quality string, no logic changes are required — only the QUALITIES list itself, its tests, and marketing copy need to change.

Changes

1. Quality list — `src/lib/ytdlp-options.ts`

export const QUALITIES = ['best', '2160p', '1440p', '1080p', '720p', '480p', '360p'] as const

2. Tests

src/lib/__tests__/ytdlp-probe.test.ts: add a case with a 4K-height fixture (height: 2160) asserting availableQualities includes '2160p' and '1440p'. The existing 1080p-source case is unaffected (2160p/1440p correctly excluded since maxHeight there is 1080).
src/lib/__tests__/ytdlp.test.ts: add a case for quality: '2160p' asserting the built args contain height<=?2160, mirroring the existing 1080p case.

3. Marketing copy — `messages/{en,fr,es,it}.json`

Replace the "up to 1080p" claim (and localized equivalents) with "up to 4K" in the 5 affected keys, in each of the 4 locale files: formatsDesc, step2Desc, a4, and the two faqA2 occurrences (home FAQ + platform-page FAQ). Only the resolution figure changes; surrounding wording stays identical.

Out of scope

No change to the download pipeline, worker, or database schema — the format selector and probe filtering are already resolution-agnostic.
No change to per-platform SEO page copy (src/lib/downloader-platforms.ts) — it does not mention a specific resolution ceiling.

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