feat: add Opus 4.7 as default model and fix alias/thinking bugs (#928)

- Add CLAUDE_OPUS_4_7_CONFIG and register it in ALL_MODEL_CONFIGS
- Set Opus 4.7 as default for firstParty in getDefaultOpusModel() (3P stays on 4.6 until rollout)
- Fix sonnet[1m] → 404 bug: query.ts was passing raw alias to API without resolving via parseUserSpecifiedModel
- Add opus-4-7 to modelSupportsAdaptiveThinking so it uses { type: 'adaptive' } not { type: 'enabled' }
- Fix duplicate opus47 case and wrong opus46[1m] fallthrough in getPublicModelDisplayName switch
- Update user-facing display strings (picker labels, plan mode description) to reference Opus 4.7
- Add 3P fallback suggestion chain for opus-4-7 → opus-4-6 in validateModel

Co-authored-by: OpenClaude <openclaude@gitlawb.com>

src/utils/model/validateModel.ts

@@ -202,6 +202,9 @@ function get3PFallbackSuggestion(model: string): string | undefined {
     return undefined
   }
   const lowerModel = model.toLowerCase()
+  if (lowerModel.includes('opus-4-7') || lowerModel.includes('opus_4_7')) {
+    return getModelStrings().opus46
+  }
   if (lowerModel.includes('opus-4-6') || lowerModel.includes('opus_4_6')) {
     return getModelStrings().opus41
   }