feat: update funding screen to match v60 design

[jvsena42]

Closes #873

FIGMA

This PR:

1. Replaces the Advanced button with a Manual Setup shortcut on the Funding screen, navigating directly to the external node connection flow
2. Updates the funding screen description text to match the latest Figma design
3. Updates all 15 locale translations accordingly

Preview

Screen_recording_20260403_073030.webm

QA Notes

1. Navigate to the Funding screen (Spending Balance → Fund)
2. Verify the third button now shows "Manual Setup" with a pencil icon instead of "Advanced" with a share icon
3. Tap "Manual Setup" and confirm it navigates directly to the External Node connection screen (skipping the old Advanced screen)
4. Verify the description text reads "The easiest option is to use your Bitkit savings or send bitcoin from a different wallet."
5. Switch device language to a supported locale (e.g., Spanish, Portuguese, German) and verify the updated text and button label are translated

[claude]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.