Replace unsupported Anthropic image blocks with an [Unsupported Image] marker when routed models are text-only or upstream rejects image input.
Add rectifier settings for media fallback and heuristic model detection, wire the controls into the settings UI, and cover the sanitizer and forwarder gates with regression tests.
* feat(proxy): add thinking signature rectifier for Claude API
Add automatic request rectification when Anthropic API returns signature
validation errors. This improves compatibility when switching between
different Claude providers or when historical messages contain incompatible
thinking block signatures.
- Add thinking_rectifier.rs module with trigger detection and rectification
- Integrate rectifier into forwarder error handling flow
- Remove thinking/redacted_thinking blocks and signature fields on retry
- Delete top-level thinking field when assistant message lacks thinking prefix
* fix(proxy): complete rectifier retry path with failover switch and chain continuation
- Add failover switch trigger on rectifier retry success when provider differs from start
- Replace direct error return with error categorization on rectifier retry failure
- Continue failover chain for retryable errors instead of terminating early
* feat(proxy): add rectifier config with master switch
- Add RectifierConfig struct with enabled and requestThinkingSignature fields
- Update should_rectify_thinking_signature to check master switch first
- Add tests for master switch functionality
* feat(db): add rectifier config storage in settings table
Store rectifier config as JSON in single key for extensibility
* feat(commands): add get/set rectifier config commands
* feat(ui): add rectifier config panel in advanced settings
- Add RectifierConfigPanel component with master switch and thinking signature toggle
- Add API wrapper for rectifier config
- Add i18n translations for zh/en/ja
* feat(proxy): integrate rectifier config into request forwarding
- Load rectifier config from database in RequestContext
- Pass config to RequestForwarder for runtime checking
- Use should_rectify_thinking_signature with config parameter
* test(proxy): add nested JSON error detection test for thinking rectifier
* fix(proxy): resolve HalfOpen permit leak and RectifierConfig default values
- Fix RectifierConfig::default() to return enabled=true (was false due to derive)
- Add release_permit_neutral() for releasing permits without affecting health stats
- Fix 3 permit leak points in rectifier retry branches
- Add unit tests for default values and permit release
* style(ui): format ProviderCard style attribute
* fix(rectifier): add detection for signature field required error
Add support for detecting "signature: Field required" error pattern
in the thinking signature rectifier. This enables automatic request
rectification when upstream API returns this specific validation error.
Jason