diff --git a/src/components/search/SearchWithSuggestions.tsx b/src/components/search/SearchWithSuggestions.tsx
index 561001fc3..e01e82400 100644
--- a/src/components/search/SearchWithSuggestions.tsx
+++ b/src/components/search/SearchWithSuggestions.tsx
@@ -197,10 +197,3 @@ export function SearchWithSuggestions({
     </div>
   );
 }
-
-// Add type declaration for SpeechRecognition
-declare global {
-  interface Window {
-    webkitSpeechRecognition: typeof SpeechRecognition;
-  }
-}
diff --git a/src/hooks/intelligence/useSpeechRecognition.ts b/src/hooks/intelligence/useSpeechRecognition.ts
index 75fcf53da..b8d8ad567 100644
--- a/src/hooks/intelligence/useSpeechRecognition.ts
+++ b/src/hooks/intelligence/useSpeechRecognition.ts
@@ -15,55 +15,6 @@ interface SpeechRecognitionResult {
   error: string | null;
 }
 
-// TypeScript declarations for Web Speech API
-interface SpeechRecognitionEvent extends Event {
-  results: SpeechRecognitionResultList;
-  resultIndex: number;
-}
-
-interface SpeechRecognitionResultList {
-  length: number;
-  item(index: number): SpeechRecognitionResultItem;
-  [index: number]: SpeechRecognitionResultItem;
-}
-
-interface SpeechRecognitionResultItem {
-  isFinal: boolean;
-  length: number;
-  item(index: number): SpeechRecognitionAlternative;
-  [index: number]: SpeechRecognitionAlternative;
-}
-
-interface SpeechRecognitionAlternative {
-  transcript: string;
-  confidence: number;
-}
-
-interface SpeechRecognitionErrorEvent extends Event {
-  error: string;
-  message: string;
-}
-
-declare global {
-  interface Window {
-    SpeechRecognition: new () => SpeechRecognition;
-    webkitSpeechRecognition: new () => SpeechRecognition;
-  }
-}
-
-interface SpeechRecognition extends EventTarget {
-  continuous: boolean;
-  interimResults: boolean;
-  lang: string;
-  start(): void;
-  stop(): void;
-  abort(): void;
-  onresult: ((event: SpeechRecognitionEvent) => void) | null;
-  onerror: ((event: SpeechRecognitionErrorEvent) => void) | null;
-  onend: (() => void) | null;
-  onstart: (() => void) | null;
-}
-
 export function useSpeechRecognition({
   onResult,
   onError,
diff --git a/src/types/browser.d.ts b/src/types/browser.d.ts
index afc8d0da1..b890ece52 100644
--- a/src/types/browser.d.ts
+++ b/src/types/browser.d.ts
@@ -6,8 +6,8 @@
 interface Window {
   webkitAudioContext?: typeof AudioContext;
   /** Web Speech API (standard + webkit prefix) */
-  SpeechRecognition?: typeof SpeechRecognition;
-  webkitSpeechRecognition?: typeof SpeechRecognition;
+  SpeechRecognition: typeof SpeechRecognition;
+  webkitSpeechRecognition: typeof SpeechRecognition;
   /** Safari standalone mode detection */
   navigator: Navigator & {
     standalone?: boolean;
@@ -20,3 +20,40 @@ interface Navigator {
   /** Safari standalone mode */
   standalone?: boolean;
 }
+
+/**
+ * Web Speech API recognizer types.
+ * Absent from lib.dom in the TypeScript version used here, so declared once
+ * globally as the single source of truth (replaces scattered, conflicting
+ * per-file `declare global` blocks). Shape is a superset compatible with every
+ * consumer's local usage (maxAlternatives, onspeechend, permissive onerror).
+ */
+interface SpeechRecognitionEvent extends Event {
+  results: SpeechRecognitionResultList;
+  resultIndex: number;
+}
+
+interface SpeechRecognitionErrorEvent extends Event {
+  error: string;
+  message?: string;
+}
+
+interface SpeechRecognition extends EventTarget {
+  continuous: boolean;
+  interimResults: boolean;
+  lang: string;
+  maxAlternatives: number;
+  start(): void;
+  stop(): void;
+  abort(): void;
+  onresult: ((event: SpeechRecognitionEvent) => void) | null;
+  onerror: ((event: SpeechRecognitionErrorEvent) => void) | null;
+  onend: (() => void) | null;
+  onstart: (() => void) | null;
+  onspeechend: (() => void) | null;
+}
+
+declare var SpeechRecognition: {
+  prototype: SpeechRecognition;
+  new (): SpeechRecognition;
+};