fix(eid-wallet): show the identity verification screens in the app's language

[Bekiboo]

Description of change

The identity verification screens come from Didit's hosted UI, so the translations in #1145 never reached them: a Russian or Ukrainian user saw English from the moment verification started.

Didit takes a language on session creation and supports ru and uk under the same ISO 639-1 codes the app already uses. We were omitting it, and Didit's fallback — detecting the browser language — does not work inside the Tauri webview.

The locale has to travel from the wallet through the provisioner, so this touches both sides. The wallet sends its active locale on the four calls that open a session; evault-core forwards it to Didit.

Issue Number

Closes #1153

Type of change

Fix (a change which fixes an issue)

How the change has been tested

pnpm check in eid-wallet (0 errors, 5 pre-existing warnings) and tsc in evault-core both pass. 12 new unit tests cover the code validation.

Not tested against Didit's API. The language field is documented and the codes are confirmed supported, but nobody has watched a real session come up in Russian — worth one manual pass before this is relied on.

Change checklist

• I have ensured that the CI Checks pass locally
• I have removed any unnecessary logic
• My code is well documented
• I have signed my commits
• My code follows the pattern of the application
• I have self reviewed my code

Notes

• Four call sites open a session: ePassport, onboarding, the KYC upgrade overlay and account recovery. Recovery goes through /recovery/start-session rather than /verification/v2, so it needed handling separately.
• Anything that is not a plausible ISO 639-1 code falls back to en instead of being handed to Didit as-is. Format is checked rather than matched against a fixed list, so adding a wallet locale needs no change here.
• Recovery is the one that mattered most: someone recovering an account is already in trouble, and that was the worst place to drop them into English.

Docs: https://docs.didit.me/sessions-api/create-session

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📥 Commits

Reviewing files that changed from the base of the PR and between 955bcaf and 374462d.

📒 Files selected for processing (8)

• infrastructure/eid-wallet/src/routes/(app)/ePassport/+page.svelte
• infrastructure/eid-wallet/src/routes/(app)/main/legacy/KycUpgradeOverlay.svelte
• infrastructure/eid-wallet/src/routes/(auth)/onboarding/+page.svelte
• infrastructure/eid-wallet/src/routes/(public)/recover/+page.svelte
• infrastructure/evault-core/src/controllers/RecoveryController.ts
• infrastructure/evault-core/src/controllers/VerificationController.ts
• infrastructure/evault-core/src/utils/verificationLanguage.spec.ts
• infrastructure/evault-core/src/utils/verificationLanguage.ts

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