fix: improve Kimi K2.5 image support logic and add tests

- Only block kimi-k2 specifically, not all Kimi models
- Add unit test for kimi-k2.5 image support

lib/ai-providers.ts

@@ -1161,8 +1161,15 @@ export function supportsImageInput(modelId: string): boolean {
         lowerModelId.includes("vision") || lowerModelId.includes("vl")
 
     // Models that DON'T support image/vision input (unless vision variant)
-    // Kimi K2 models don't support images
-    if (lowerModelId.includes("kimi") && !hasVisionIndicator) {
+    // Kimi K2 doesn't support images, but K2.5 does
+    // Only block kimi-k2 specifically, not other Kimi models
+    if (
+        (lowerModelId.includes("kimi-k2") ||
+            lowerModelId.includes("kimi_k2")) &&
+        !hasVisionIndicator &&
+        !lowerModelId.includes("2.5") &&
+        !lowerModelId.includes("k2.5")
+    ) {
         return false
     }
 

tests/unit/ai-providers.test.ts

@@ -168,6 +168,11 @@ describe("supportsImageInput", () => {
         expect(supportsImageInput("moonshot/kimi-k2")).toBe(false)
     })
 
+    it("returns true for Kimi K2.5 models (supports vision)", () => {
+        expect(supportsImageInput("kimi-k2.5")).toBe(true)
+        expect(supportsImageInput("moonshotai/kimi-k2.5")).toBe(true)
+    })
+
     it("returns false for DeepSeek text models", () => {
         expect(supportsImageInput("deepseek-chat")).toBe(false)
         expect(supportsImageInput("deepseek-coder")).toBe(false)