feat(about): rebuild the About box as a conversion surface

Creator: the About box was "shitty" — an unreadable logo, a version number nobody asked for, copy that
insulted the creator, and buttons that looked like text. Rebuilt around one job: convert.

- **820×860 modal** (was 650×700) with a scrollable hub, and the logo at **520 px wide** instead of
  125 — the asset is 2816×1536, so it was being drawn as a thumbnail, not an icon problem.
- **Pre-Release pill** replaces "Version 1.0.0" (the assembly version stays in log lines). The pill is a
  button: it opens llamacasty.com until a Steam store page exists, so the link changes in one place.
- Tagline: "1-2-3, and go live to the world on YouTube!" The old "simple enough that even the most
  right-brained person can intuit it" is gone, and a test asserts it stays gone.
- The offer in three short blocks (free 30 fps · paid 60 fps · one-time, lifetime, no account /
  subscription / tracking), then the launch price and **one primary CTA**: "Unlock 60 fps — $79".
- Price: $79 until **April 1, 2027**, then $99 locked for life. The numbers live once, in
  `MainViewModel.Overlays`, and are recorded in `docs/ai/commercial.md`.
- **A paying customer is never sold to**: ownership collapses the price/CTA block and shows
  "Licence: owned via Steam — thank you."
- Secondary destinations (channel, Mastodon, coffee, licences) are one quiet row; footer is
  `© Llama Chile Shop`; the "Made by gramps" line is removed.
- `YtButtonSecondary` now carries a higher surface, a hairline border and a keyboard focus ring — they
  were the same tone as the panel behind them, which is why they read as plain text.

Test: `AboutHubTests.About_ShowsTheOfferToFreeUsers_AndNothingToSellToOwners` — tagline, pill, price,
CTA text, copyright, the removed lines stay removed, and the CTA block collapses when owned.
FAST gate: 540 passed, 0 failed, 0 warnings.

ViewModels/MainViewModel.Overlays.cs

@@ -29,6 +29,27 @@ public partial class MainViewModel : ViewModelBase
     public const string CoffeeUrl = "https://buymeacoffee.com/llamachiley";
     public static string AppVersionLabel => $"Version {typeof(MainViewModel).Assembly.GetName().Version?.ToString(3)}";
 
+    // ── About box copy (creator ruling, 2026-11-05). The price and its end date live HERE, once, so
+    // the app, the site and docs/commercial.md cannot drift apart. ──
+    public const string LaunchPrice = "$79";
+    public const string StandardPrice = "$99";
+    public const string LaunchPriceEndsLabel = "April 1, 2027";
+
+    /// <summary>The release state shown as a badge. Not the assembly version — that number is for
+    /// log lines, not for the creator.</summary>
+    public static string AppReleaseLabel => "Pre-Release";
+
+    public string UpgradeCtaLabel => $"Unlock 60 fps — {LaunchPrice}";
+    public string PriceLine => $"Launch price {LaunchPrice}";
+    public string PriceNote => $"Until {LaunchPriceEndsLabel} — after that {StandardPrice}, locked for life.";
+    public string FreeOfferText => "Livestream and record at 30 fps.";
+    public string PaidOfferText => "Unlocks 60 fps for streaming and recording.";
+    public string TrustLine => "One-time purchase · lifetime licence · no account, no subscription, no tracking.";
+
+    /// <summary>Shown instead of the price and CTA once ownership is verified: a paying customer is
+    /// never sold to.</summary>
+    public string LicenceStateLabel => IsAppOwned ? "Licence: owned via Steam — thank you." : string.Empty;
+
     /// <summary>The About hub's optional product-information link.</summary>
     public bool IsPremiumAvailable => PremiumUrl.Length > 0;