Onboarding wizard with beginner/expert setup paths

[thibistaken]

Rework the onboarding flow to include a setup wizard with two paths:

Beginner path (post wallet creation):

• Default currency selection
• Basic settings

Expert path (pre wallet creation, optional):

• Autoswap config
• Log reports opt-in/out (migration logs always on)
• Electrum server selection

Also includes:

• Error reporting opt-in wizard (user can opt out of reports but NOT migration logs)
• Reworked error screen — less alarming, more reassuring

Open question: single wizard with "Advanced settings" button at the end, or two separate wizards. Discuss with Francis.

Acceptance criteria:

• Fresh install shows beginner vs expert setup choice
• Beginner path: wallet creation → basic settings (currency, etc.)
• Expert path: advanced options wizard before wallet creation
• Error reporting wizard with migration log toggle locked on
• Redesigned error screen with friendlier UI (undraw illustrations)

[BullishNode]

specs not approved yet*