feat: blocks widget v61 + OS widget

[jvsena42]

This PR:

1. Redesigns the in-app Bitcoin Blocks widget to match Figma v61.
2. Adds a native iOS Home Screen Bitcoin Blocks widget supporting Small and Medium families.
3. Restructures the Blocks edit screen and adds a v61 preview screen.
4. Reduces the Blocks option set to seven fields (Block, Time, Date, Transactions, Size, Fees, Source) and adds Fees fetched from mempool.space.

Description

The in-app Bitcoin Blocks widget gets the v61 layout: a vertical list of icon + label + value rows where each icon is rendered in brand orange. The compact (small) variant drops the label column and only renders icon + value rows so the small card stays readable.

The option set drops weight, difficulty, hash, and merkleRoot and adds a new fees field that surfaces total block fees. Defaults are now Block, Time, Date, and Transactions. BlocksWidgetOptions keeps a custom Codable shim so existing on-disk preferences from older builds decode without losing the four still-supported fields. The mempool fetcher moves to /api/v1/block/{hash} so it can read extras.totalFees.

A new Bitcoin Blocks home-screen widget ships as BitkitBlocksWidget, supporting .systemSmall and .systemMedium families. Both sizes cap rendering at four rows using the same default-priority logic — Block, Time, Date, Transactions take precedence; Size, Fees, and Source fill any remaining slot only when one of the defaults is toggled off. The widget mirrors the in-app options through the existing group.bitkit App Group via a new BlocksHomeScreenWidgetOptionsStore, and the timeline provider refreshes every ~15 minutes (with cache fallback when the network call fails). Rendering honors widgetRenderingMode so the widget reads correctly in full-color, accented (Liquid Glass / StandBy), and lock-screen modes.

The edit screen is restructured into a single DATA section, with each row showing the brand-orange field icon next to its label and live value. The WidgetEditView now treats .blocks like .price — the navigation bar shows the widget name and the description block is hidden.

The preview screen is rewritten to mirror the price/headlines preview: description, "Widget Settings" cell, Compact↔Wide carousel, size label and dot indicator, and Save Widget / Delete buttons.

While in there: copied the seven Blocks-widget icons (cube, clock, calendar, arrow-up-down, file-text, coins, globe) into the widget extension's asset catalog so the home-screen widget can render them, and updated WidgetsBackupConverter to map the Android showFees preference into the new iOS field.

Mirrors the v61 redesign shipped on Android in bitkit-android#922.

Linked Issues/Tasks

N/A

Screenshot / Video

Simulator.Screen.Recording.-.iPhone.16.-.2026-05-07.at.16.01.54.mp4

QA Notes

Manual Tests

• 1. Wallet home → in-app Bitcoin Blocks widget renders v61 layout: icon + label + value rows in brand orange.
• 2a. Widget feed → Bitcoin Blocks → preview: centered "Bitcoin Blocks" top bar (no menu/drawer button), description, "Widget Settings" cell, Compact↔Wide carousel, size label, dot indicator, Save Widget button.
  • 2b. Preview → swipe carousel: size label flips between Small and Wide.
  • 2c. If widget already saved: Delete and Save Widget buttons both appear.
• 3a. Preview → Widget Settings → edit screen: centered "Bitcoin Blocks" top bar (no menu/drawer button, no description block), DATA section header, seven toggle rows in order Block / Time / Date / Transactions / Size / Fees / Source, each with brand-orange icon + label + live value.
  • 3b. Toggle defaults off → Reset enabled, Preview disabled when all toggles are off.
  • 3c. Toggle Fees on → save → in-app widget shows the Fees row with the live value.
• 4. Home screen long-press → + → search "Bitkit": Bitcoin Blocks appears with Small and Medium previews (no Large).
• 5a. Add Blocks at Medium → wide layout renders only the four highest-priority enabled rows (Block, Time, Date, Transactions by default).
  • 5b. Toggle Time off + Size on → Medium shows Block, Date, Transactions, Size (defaults still take priority, Size fills the remaining slot).
• 6a. Add Blocks at Small → compact layout renders icon + value rows, capped at 4 with the same priority logic.
  • 6b. Toggle Date off + Fees on + Source on → Small shows Block, Time, Transactions, Fees (Source dropped because the cap is 4 and Fees is declared first among extras).
• 7. Edit toggles in app → home-screen widget reloads within ~1s and reflects new toggles (verify on Medium and Small).

[jvsena42]

feature implemented, pending a code cleanup