feat: google gemini provider, adaptive thinking for opus 4.7, model search filter

- Added Google (Gemini) as a provider: add-key UI, env var resolution via resolveApiKey, usage tracking via native models endpoint + gemini.google.com cookie scraping
- @ai-sdk/anthropic upgraded to v3 (adaptive thinking support) with LanguageModelV1 cast for ai v4 compat
- Claude Opus 4.7 uses adaptive thinking (type: adaptive); all other models keep explicit budget tokens
- Model selector modal: search filter with space matching dash/underscore
- Copy button: all tool results truncated at 300 chars
- Sidebar layout fix: Claude Reset panel removed from flex-1 fill to prevent overlap

1 files changed, 7 insertions, 3 deletions

diff --git a/packages/core/src/credentials/api-keys.ts b/packages/core/src/credentials/api-keys.ts
index af5aa0e..ef30400 100644
--- a/packages/core/src/credentials/api-keys.ts
+++ b/packages/core/src/credentials/api-keys.ts
@@ -40,10 +40,14 @@ export function getApiKey(keyId: string): string | null {
 }
 
 /**
- * Resolve an API key from the database. Returns null if not found.
+ * Resolve an API key from the database, with env var fallback.
+ * Pass the env var name (e.g. "GOOGLE_API_KEY") to check process.env as well.
  */
-export function resolveApiKey(keyId: string): string | null {
-	return getApiKey(keyId);
+export function resolveApiKey(keyId: string, envVar?: string): string | null {
+	const dbKey = getApiKey(keyId);
+	if (dbKey) return dbKey;
+	if (envVar) return process.env[envVar] ?? null;
+	return null;
 }
 
 /**