feat: facts widget v61 + OS widget

[pwltr]

Description

This PR:

1. Adds small and medium Bitcoin Facts home screen widgets.
2. Updates the in-app Bitcoin Facts widget to match the new text-and-logo design, including small and wide previews.
3. Removes obsolete Bitcoin Facts customization state now that the source row is no longer part of the design.
4. Reuses the existing localization files for the home screen widget metadata.

Screenshot / Video

Simulator.Screen.Recording.-.iPhone.17.-.2026-05-15.at.21.21.15.mov

QA Notes

Manual Tests

• 1. Widgets → Bitcoin Facts: small and wide in-app previews render with fact text and Bitcoin logo.
• 2. Widgets → Bitcoin Facts → Save Widget: widget can be added and removed without edit options.
• 3. Home screen → add Bitcoin Facts small widget: fact text and logo render correctly in normal mode.
• 4. Home screen → add Bitcoin Facts medium widget: fact text and top-right logo render without overlap.
• 5. Home screen → switch to tinted widget mode: Bitcoin Facts logo remains visible.
• 6. regression: widget gallery: Bitcoin Facts name and description are localized instead of showing raw keys.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Avoid shipping unresolved localization keys in widget metadata

Using localization keys directly in the widget configuration causes raw keys to appear for locales where these entries are missing in Bitkit/Resources/Localization/*/Localizable.strings (for example ar, el, and pt for widgets__facts__name, plus several locales for widgets__facts__description). Unlike the app’s t(...) helper, WidgetKit doesn’t apply your English fallback logic here, so affected users will see widgets__facts__... in the system widget gallery instead of readable text.

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