LaunchWizard OOBE: timezone-only region, password UX, async Wi-Fi scan

[eggfly]

Summary

• #111 / #98: Drop the country-selection step; go straight from Welcome to a concise list of common international time zones (IANA names).
• #99: Block advancing (OK/TAB) when password and confirmation differ, showing an inline "Passwords do not match" error instead of silently doing nothing; the error clears on edit/focus change.
• #94: Scan Wi-Fi asynchronously so the list screen appears immediately with a loading spinner and refreshes as soon as results arrive.
• Codex/update app time timer #80: Show the focused password field in plaintext and mask it once focus moves away (no separate reveal button).

Test plan

• Cross-compiled LaunchWizard (arm64 docker) and deployed to device 192.168.50.150; wizard runs, Welcome goes straight to the timezone list (country step gone).
• Enter mismatched passwords; confirm OK/TAB is blocked with the inline error.
• Enter the Wi-Fi step; confirm the spinner shows and the list fills in when the scan returns.
• Confirm the focused password field is plaintext and becomes masked when focus moves to the next field.

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