feat(onboarding): let a user pick any country, badged as limited support

[suiramdev]

Summary

The onboarding country step listed 196 countries but let a user select France only: every other row was a disabled button badged "Not supported yet", so a reader outside France could not finish onboarding. Every country is now selectable, and a country Freenary does not support fully keeps a badge — now Limited support — in its label and in its accessible name. Look first at country-option.tsx, where the disabled prop and its dead disabled:* classes are gone.

Motivation

• A non-French user reached a dead end, and onboarding gates every other screen.
• Nothing outside that button needed the gate: completeOnboarding takes any country string, listInstitutions already asks the provider per country.
• The badge already carried the honest part; only "you cannot select this" was wrong.
• packages/api's SUPPORTED_COUNTRIES is a different axis (keyword and parser layers) and stays untouched.

Drawbacks

• A user whose provider covers no bank now reaches the bank step and sees an empty list. Previously unreachable, now documented.
• Categorisation is weaker outside France, and one badge is all the interface says about it.
• The two message keys were renamed, not redefined, so an external catalog copy loses those strings.
• France stays hoisted to the top; this PR does not revisit that.

Prior art

• The bank step already offers what the provider returns and reports an empty list rather than hiding itself.
• Country gates in banking apps usually encode regulation; this one only encoded rule coverage.
• Keeping the sort hoist and dropping the block matches how the search box ranks instead of blocking.

Notes

• Visual change: yes. Every row is interactive; the badge reads "Limited support" / "Prise en charge limitée". Checked in light and dark mode.
• Verified in the running stack: 196 rows, 0 disabled; Germany → Continue → bank step → Finish → Home, country=DE in Postgres. Both new strings checked in French.
• No test added: one predicate plus a removed prop, proven against the app. bun run check, check-types and build pass.
• Docs updated: guides/first-steps.mdx and self-hosting/bank-providers.mdx.
• Review: the reviewer agent requested changes on three docs claims, then returned approved with no findings.
• No migration, no breaking change, no merge-order constraint.

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