diff --git a/src/components/ThemeSwitcher.tsx b/src/components/ThemeSwitcher.tsx
index e2e2073e..8dc67b09 100644
--- a/src/components/ThemeSwitcher.tsx
+++ b/src/components/ThemeSwitcher.tsx
@@ -46,7 +46,7 @@ function getStoredTheme(): Theme {
       return stored as Theme;
     }
   } catch {
-    // localStorage unavailable
+    // localStorage unavailable (e.g. private browsing, SSR)
   }
   return 'app';
 }
@@ -55,7 +55,7 @@ function storeTheme(theme: Theme): void {
   try {
     localStorage.setItem(STORAGE_KEY, theme);
   } catch {
-    // localStorage unavailable
+    // localStorage unavailable (e.g. private browsing, SSR)
   }
 }
 
diff --git a/src/lib/llm/kilo.ts b/src/lib/llm/kilo.ts
index 22156a6e..bbf27890 100644
--- a/src/lib/llm/kilo.ts
+++ b/src/lib/llm/kilo.ts
@@ -101,7 +101,7 @@ export class KiloGatewayProvider implements LLMProvider {
             yield { content, done: false };
           }
         } catch {
-          // Skip invalid JSON
+          // Expected: SSE chunk not yet complete or invalid JSON
         }
       }
     }
diff --git a/src/lib/llm/openrouter.ts b/src/lib/llm/openrouter.ts
index e24864c2..2395a11b 100644
--- a/src/lib/llm/openrouter.ts
+++ b/src/lib/llm/openrouter.ts
@@ -101,7 +101,7 @@ export class OpenRouterProvider implements LLMProvider {
             yield { content, done: false };
           }
         } catch {
-          // Skip invalid JSON
+          // Expected: SSE chunk not yet complete or invalid JSON
         }
       }
     }
diff --git a/src/lib/perf/core.ts b/src/lib/perf/core.ts
index 308541b7..5330b5f9 100644
--- a/src/lib/perf/core.ts
+++ b/src/lib/perf/core.ts
@@ -52,7 +52,7 @@ export const perf = {
     try {
       performance.mark(`${PERF_PREFIX}${name}`);
     } catch {
-      // silently ignore in unsupported environments
+      // Performance API unavailable (e.g. SSR, older browsers)
     }
   },
 
@@ -86,7 +86,7 @@ export const perf = {
       performance.clearMarks();
       performance.clearMeasures();
     } catch {
-      // ignore
+      // Performance API unavailable
     }
   },