[sophiecarreras]

Fixes seven edge-case bugs found in a review of master, and adds or strengthens tests. Each fix has a test.

Fixes

• B2AccountAuthorizationCache: no longer caches an authorization for a different account after the account-id mismatch check fails.
• B2WebApiHttpClientImpl.getContent: honors the timeouts configured on the HttpClientFactory. Adds a default HttpClientFactory.getRequestConfig(), overridden by HttpClientFactoryImpl.
• B2LargeFileStorer: part index and start byte come from the sorted part list, so progress events are correct for out-of-order parts.
• B2CancellableContentSource: the wrapped stream is closed even when close() reports the cancellation.
• B2EventNotificationRule: isSuspended() and compareTo() no longer throw NullPointerException when suspension fields are not provided.
• B2InputStreamExcerpt.skip(): no longer advances the position twice.
• JSON handlers for LocalDate, ConcurrentMap and EnumSet: throw B2JsonException for invalid dates and null elements instead of unchecked exceptions.

Tests

• New tests for each fix.
• Stronger tests for the finish-large-file request payload, content writer sha1 handling, ranged content sources, unverified sha1 headers, JSON field handling and BigInteger, and the resume path.
• Error-path download tests now fail if getContent does not throw.

Notes for reviewers

• HttpClientFactory gains a default method; custom factories keep the default timeouts unless they override it.
• Verified with ./gradlew test (core 703, httpclient 4, 0 failures) and check_code. The fail-before proofs were run on the individual changes earlier, not re-run on this combined branch.
• The findings came from an automated review and have not been confirmed by a maintainer yet; please treat the fixes as proposals.

🤖 Generated with Claude Code

[sophiecarreras]

Review request from Sofia (drafted with Claude). Nothing in this review has been checked by a human yet; the numbers come from an agent review of whole main. Please verify, in this order:

1. For each new or changed test, revert the production line it covers (or the named fix) and confirm the test fails. A test that still passes is a finding.
2. No production behavior changed beyond what the description says.
3. The decision or check listed for this PR below.
   Reply on the linked issue if a finding is a real bug, not a bug, or already known.

This PR: nothing open besides the review. CI is green. Ready for sign-off.

[sophiecarreras]

@jeronimodeleon: you are the sign-off for this PR once Felipe, Gonzalo and Eduardo have reviewed it. GitHub would not let me add you as a reviewer (you have read access on this repo), so this is your request. What to confirm is in the comment above.