Kotlin Client SDK: Update sign-into-mobile-app-redirect guide to the 2.x SDK

[brentschaus-okta]

Description:

• What's changed?

1. Update the Android (Kotlin) guide to the 2.x SDK

Updates the Android (Kotlin) version of the "Sign into mobile app redirect" guide to the current okta-mobile-kotlin 2.x SDK (BOM 2.0.3). This is the Kotlin counterpart to the Swift refresh in #5953. The guide previously targeted the 1.x SDK (CredentialBootstrap, OidcClient, OidcClientResult), which was removed or renamed in 2.x and no longer compiles against today's SDK.

• addconfigpkg: BOM 1.0.0 → 2.0.3; auth-foundation-bootstrap → auth-foundation + oauth2 (kept web-authentication-ui).
• configmid: discoveryUrl/DISCOVERY_URL → issuer/ISSUER in the properties list, placeholder table, and buildConfigField block; dropped the /.well-known/openid-configuration suffix (2.x derives this automatically).
• opensignin: SDK init now uses AuthFoundation.initializeAndroidContext(this) + OidcConfiguration.default; sign-in/sign-out use WebAuthentication(), OAuth2ClientResult, and Credential.store/setDefaultAsync/getDefaultAsync/delete. Sign-in state is now a null-check on the default credential (a Credential can no longer hold a null token in 2.x).
• getuserinfo, usetoken: CredentialBootstrap.defaultCredential() → Credential.getDefaultAsync().
• samplecode: repointed to the SDK repo's own sample (okta-mobile-kotlin/tree/master/app), mirroring the Swift PR.
• index (shared): fixed the to user an → to use an title typo introduced in Swift Client SDK: Update "sign in to mobile - redirect" guide #5953 (also corrects the iOS page, since the title is shared).

Every code snippet was verified against the okta-mobile-kotlin@master sample app (SampleApplication.kt, BrowserViewModel.kt, DashboardViewModel.kt) and the Credential source.

2. Cross-link cleanup (related to the above)

• Journeys: the mobile-redirect bullets in the OCI-mobile and OCI-secure-your-first-web-app journeys linked only to the iOS guide. Repointed them to the framework-neutral guide path so the updated Kotlin/Android version is surfaced too.
• Stale anchor fix: keep-user-signed-in related links (android + ios) pointed to a #check-for-a-session-at-startup anchor that no longer exists in the redirect guide. Repointed to the standalone check-for-session guide, matching how the redirect guide now references it.

3. Inline naming StackSnippet

What's changed?

• Names the platform SDK per framework in the Sign into a mobile app using the redirect model guide, so readers see their own platform's SDK named in the prose rather than a generic "Okta SDK."

• Adds an inline sdkname StackSnippet that resolves to Okta Client SDK for Swift (iOS) / Okta Client SDK for Kotlin (Android).

• Wires that snippet into the three generic SDK references in the shared main/index.md (Add packages, Define a callback route, Open the sign-in page).

• Names the SDK explicitly in the per-framework dependency snippets (addconfigpkg.md): "Okta Mobile Kotlin library" → "Okta Client SDK for Kotlin"; "Okta OIDC package" → "Okta Client SDK for Swift package". This matches the dominant "Okta Client SDK for " phrasing already used across the docs, and mirrors the same change made to the sign-users-in-mobile-self-hosted guide.

• Is this PR related to a Monolith release? No.

Resolves:

• OKTA-1089674

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[okta-prod-github-app]

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✅ packages/@okta/vuepress-site/docs/guides/sign-into-mobile-app-redirect/main/android/configmid.md	89	100	79	100
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✅ packages/@okta/vuepress-site/docs/guides/sign-into-mobile-app-redirect/main/android/samplecode.md	85	100	14	100
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✅ packages/@okta/vuepress-site/docs/guides/sign-into-mobile-app-redirect/main/index.md	94	100	80	93
✅ packages/@okta/vuepress-site/docs/guides/sign-into-mobile-app-redirect/main/ios/addconfigpkg.md	82	100	100	55
✅ packages/@okta/vuepress-site/docs/guides/sign-into-mobile-app-redirect/main/ios/sdkname.md	100	100	100	100
✅ packages/@okta/vuepress-site/docs/journeys/OCI-mobile/main/index.md	95	100	100	85
✅ packages/@okta/vuepress-site/docs/journeys/OCI-secure-your-first-web-app/main/index.md	97	100	100	100

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