fix(api): recover initialization after prolonged network failures

[swolfand]

What & why

Keep initialization retrying with backoff capped at one minute so offline cold starts can recover without a connectivity callback. Retry refresh timeouts and cancel superseded retries.

Fixes #853.

What to focus on

Retry cancellation after recovery, reset, and configuration changes.

Screenshots / video

Not applicable (API-only change).

Summary by CodeRabbit

• Bug Fixes
  • Initialization now retries automatically during extended connectivity issues, using exponential backoff capped at one minute.
  • Restored connectivity triggers an immediate retry.
  • Manual reinitialization starts an immediate retry and can replace pending retry attempts.
  • Retry operations are cancelled appropriately when resetting or switching configurations.

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📥 Commits

Reviewing files that changed from the base of the PR and between f9f13f1 and 8fbc0f1.

📒 Files selected for processing (3)

• source/api/src/main/kotlin/com/clerk/api/Clerk.kt
• source/api/src/main/kotlin/com/clerk/api/configuration/ConfigurationManager.kt
• source/api/src/test/java/com/clerk/api/configuration/ConfigurationManagerInitializationRetryTest.kt

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