feat: home screen redesign with vertical pager

[jvsena42]

FIGMA

Description

This PR:

1. Redesigns the home screen from a single continuous scroll into a two-page vertical pager layout (Page 0: wallet + activity, Page 1: widgets + suggestions)
2. Converts the suggestions section from a horizontal list into a 2-column grid with dismiss animations
3. Simplifies ActivityListSimple by removing the empty state row
4. Adds a "Bitkit Suggestions" entry to the Add Widgets screen with a preview screen
5. Adds a widgets onboarding hint on the wallet page to guide users to swipe down
6. Pixel-perfect alignment with Figma (spacing, padding, typography, icon sizing)
7. Default widgets configuration for new installs
8. Balance section displayed on empty wallet state
9. Widget edit mode preserves widget order
10. Various UI polish (banner padding/icons, divider colors, letter spacing, font weights)

Preview

Screen recording

Screen_recording_20260305_094625.webm

Android vs Figma comparison

State	Android	Figma
Empty wallet (onboarding)
With balance
Widgets & suggestions

QA Notes

1. Vertical Pager

• Open the app and navigate to the home screen
• Swipe down to see the widgets page (Page 1)
• Swipe up to return to the wallet page (Page 0)
• Verify pull-to-refresh only works on the wallet page

2. Widgets Onboarding Hint

• On a fresh install or after clearing settings, verify a swipe hint appears below the activity list
• Swipe to the widgets page and verify the hint disappears
• Verify the hint does not reappear after dismissal

3. Suggestions Grid

• On the widgets page, verify suggestions display as a 2-column grid (max 4 items)
• Dismiss a suggestion card and verify the animation is smooth (fade + reposition)
• Verify remaining cards rearrange properly after dismissal

4. Add Widgets - Suggestions Entry

• Navigate to Settings > Widgets > Add Widget
• Verify "Bitkit Suggestions" appears at the top of the list
• Tap it and verify the preview screen shows correctly with sample cards and an "Add Widget" button

5. Responsive Activity Count

• On smaller screens, verify fewer activity items are shown
• On larger screens, verify more activity items are shown

6. Shop Discover

• Navigate to Shop > Discover
• Verify the suggestion cards display correctly (no layout regressions from the card sizing change)

[claude]

Code review

Found 5 issues: 2 bugs and 3 CLAUDE.md violations. See inline comments below.