fix(app): wrap unprotected JSON.parse calls in try/catch

SSE stream callbacks and AI response parsing now handle malformed data
gracefully instead of throwing unhandled exceptions.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/app/src/adapters/claude-adapter.ts

@@ -51,12 +51,14 @@ export const claudeAdapter: AIAdapter = {
     }
 
     await readSSE(res, (data) => {
-      const parsed = JSON.parse(data)
-      if (parsed.type === 'content_block_delta' && parsed.delta?.text) {
-        onToken(parsed.delta.text)
-      } else if (parsed.type === 'error') {
-        onError(parsed.error?.message ?? 'Claude stream error')
-      }
+      try {
+        const parsed = JSON.parse(data)
+        if (parsed.type === 'content_block_delta' && parsed.delta?.text) {
+          onToken(parsed.delta.text)
+        } else if (parsed.type === 'error') {
+          onError(parsed.error?.message ?? 'Claude stream error')
+        }
+      } catch { /* malformed SSE chunk */ }
     }, onError, options.signal)
   },
 }

packages/app/src/adapters/openrouter-adapter.ts

@@ -60,9 +60,11 @@ export const openrouterAdapter: AIAdapter = {
 
     await readSSE(res, (data) => {
       if (data === '[DONE]') return
-      const parsed = JSON.parse(data)
-      const delta = parsed.choices?.[0]?.delta?.content
-      if (delta) onToken(delta)
+      try {
+        const parsed = JSON.parse(data)
+        const delta = parsed.choices?.[0]?.delta?.content
+        if (delta) onToken(delta)
+      } catch { /* malformed SSE chunk */ }
     }, onError, options.signal)
   },
 }

packages/app/src/composables/useAI.ts

@@ -209,12 +209,14 @@ async function streamClaude(
   }
 
   await readSSE(res, (data) => {
-    const parsed = JSON.parse(data)
-    if (parsed.type === 'content_block_delta' && parsed.delta?.text) {
-      onToken(parsed.delta.text)
-    } else if (parsed.type === 'error') {
-      onError(parsed.error?.message ?? 'Claude stream error')
-    }
+    try {
+      const parsed = JSON.parse(data)
+      if (parsed.type === 'content_block_delta' && parsed.delta?.text) {
+        onToken(parsed.delta.text)
+      } else if (parsed.type === 'error') {
+        onError(parsed.error?.message ?? 'Claude stream error')
+      }
+    } catch { /* malformed SSE chunk */ }
   }, onError, signal)
 }
 
@@ -261,9 +263,11 @@ async function streamOpenRouter(
 
   await readSSE(res, (data) => {
     if (data === '[DONE]') return
-    const parsed = JSON.parse(data)
-    const delta = parsed.choices?.[0]?.delta?.content
-    if (delta) onToken(delta)
+    try {
+      const parsed = JSON.parse(data)
+      const delta = parsed.choices?.[0]?.delta?.content
+      if (delta) onToken(delta)
+    } catch { /* malformed SSE chunk */ }
   }, onError, signal)
 }
 

packages/app/src/composables/useSimilarContent.ts

@@ -78,7 +78,10 @@ export function useSimilarContent() {
       // Extract JSON array from response
       const match = text.match(/\[[\s\S]*\]/)
       if (match) {
-        const parsed = JSON.parse(match[0]) as { title: string; reason: string }[]
+        let parsed: { title: string; reason: string }[]
+        try {
+          parsed = JSON.parse(match[0]) as { title: string; reason: string }[]
+        } catch { return }
         const items: SimilarItem[] = parsed.slice(0, 3).map(p => ({
           title: p.title,
           type,