fix(chat): restrict thinking prefix to claude

Initialize the composer thinking mode from localStorage so reloads keep the user's

selected mode instead of falling back to Standard.

Keep the chosen mode after sending because the selector behaves like a

preference, not a one-shot modifier for a single prompt.

package-lock.json

@@ -39,6 +39,7 @@
         "cmdk": "^1.1.1",
         "cors": "^2.8.5",
         "cross-spawn": "^7.0.3",
+        "dompurify": "^3.4.7",
         "express": "^4.18.2",
         "fuse.js": "^7.0.0",
         "gray-matter": "^4.0.3",
@@ -4580,6 +4581,13 @@
         "@types/node": "*"
       }
     },
+    "node_modules/@types/trusted-types": {
+      "version": "2.0.7",
+      "resolved": "https://registry.npmjs.org/@types/trusted-types/-/trusted-types-2.0.7.tgz",
+      "integrity": "sha512-ScaPdn1dQczgbl0QFTeTOmVHFULt394XJgOQNoyVhZ6r2vLnMLJfBPd53SB52T/3G36VI1/g2MZaX0cwDuXsfw==",
+      "license": "MIT",
+      "optional": true
+    },
     "node_modules/@types/unist": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/@types/unist/-/unist-3.0.3.tgz",
@@ -7485,6 +7493,15 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/dompurify": {
+      "version": "3.4.7",
+      "resolved": "https://registry.npmjs.org/dompurify/-/dompurify-3.4.7.tgz",
+      "integrity": "sha512-2jBxDJY4RR06tQNy4w5FlFH7kfxsQZlufd0sbv+chfHCxeJwrFw2baUDsSwvBISD4K4RDbd0PTfy3uNXsR6siA==",
+      "license": "(MPL-2.0 OR Apache-2.0)",
+      "optionalDependencies": {
+        "@types/trusted-types": "^2.0.7"
+      }
+    },
     "node_modules/dot-prop": {
       "version": "5.3.0",
       "resolved": "https://registry.npmjs.org/dot-prop/-/dot-prop-5.3.0.tgz",

package.json

@@ -96,6 +96,7 @@
     "cmdk": "^1.1.1",
     "cors": "^2.8.5",
     "cross-spawn": "^7.0.3",
+    "dompurify": "^3.4.7",
     "express": "^4.18.2",
     "fuse.js": "^7.0.0",
     "gray-matter": "^4.0.3",

src/components/chat/hooks/useChatComposerState.ts

@@ -143,6 +143,21 @@ const createFakeSubmitEvent = () => {
   return { preventDefault: () => undefined } as unknown as FormEvent<HTMLFormElement>;
 };
 
+const THINKING_MODE_STORAGE_KEY = 'chat-thinking-mode';
+
+const getInitialThinkingMode = () => {
+  if (typeof window === 'undefined') {
+    return 'none';
+  }
+
+  const savedMode = safeLocalStorage.getItem(THINKING_MODE_STORAGE_KEY);
+  if (!savedMode) {
+    return 'none';
+  }
+
+  return thinkingModes.some((mode) => mode.id === savedMode) ? savedMode : 'none';
+};
+
 const getNotificationSessionSummary = (
   selectedSession: ProjectSession | null,
   fallbackInput: string,
@@ -204,7 +219,7 @@ export function useChatComposerState({
   const [uploadingImages, setUploadingImages] = useState<Map<string, number>>(new Map());
   const [imageErrors, setImageErrors] = useState<Map<string, string>>(new Map());
   const [isTextareaExpanded, setIsTextareaExpanded] = useState(false);
-  const [thinkingMode, setThinkingMode] = useState('none');
+  const [thinkingMode, setThinkingMode] = useState(getInitialThinkingMode);
   const [commandModalPayload, setCommandModalPayload] = useState<CommandModalPayload | null>(null);
 
   const textareaRef = useRef<HTMLTextAreaElement>(null);
@@ -564,7 +579,7 @@ export function useChatComposerState({
 
       let messageContent = currentInput;
       const selectedThinkingMode = thinkingModes.find((mode: { id: string; prefix?: string }) => mode.id === thinkingMode);
-      if (selectedThinkingMode && selectedThinkingMode.prefix) {
+      if (provider === 'claude' && selectedThinkingMode && selectedThinkingMode.prefix) {
         messageContent = `${selectedThinkingMode.prefix}: ${currentInput}`;
       }
 
@@ -749,7 +764,6 @@ export function useChatComposerState({
       setUploadingImages(new Map());
       setImageErrors(new Map());
       setIsTextareaExpanded(false);
-      setThinkingMode('none');
 
       if (textareaRef.current) {
         textareaRef.current.style.height = 'auto';
@@ -795,6 +809,10 @@ export function useChatComposerState({
     inputValueRef.current = input;
   }, [input]);
 
+  useEffect(() => {
+    safeLocalStorage.setItem(THINKING_MODE_STORAGE_KEY, thinkingMode);
+  }, [thinkingMode]);
+
   useEffect(() => {
     if (!selectedProjectId) {
       return;

src/components/plugins/view/PluginIcon.tsx

@@ -1,4 +1,6 @@
 import { useState, useEffect } from 'react';
+import DOMPurify from 'dompurify';
+
 import { authenticatedFetch } from '../../../utils/api';
 
 type Props = {
@@ -10,6 +12,48 @@ type Props = {
 // Module-level cache so repeated renders don't re-fetch
 const svgCache = new Map<string, string>();
 
+const FORBIDDEN_SVG_TAGS = [
+  'script',
+  'foreignObject',
+  'iframe',
+  'object',
+  'embed',
+  'link',
+  'meta',
+  'style',
+  'animate',
+  'set',
+  'animateTransform',
+  'animateMotion',
+];
+
+const FORBIDDEN_SVG_ATTRS = [
+  'href',
+  'xlink:href',
+  'src',
+  'style',
+];
+
+function sanitizeSvg(svgText: string): string | null {
+  const sanitized = DOMPurify.sanitize(svgText, {
+    USE_PROFILES: { svg: true, svgFilters: true },
+    FORBID_TAGS: FORBIDDEN_SVG_TAGS,
+    FORBID_ATTR: FORBIDDEN_SVG_ATTRS,
+  });
+
+  if (!sanitized) return null;
+
+  try {
+    const doc = new DOMParser().parseFromString(sanitized, 'image/svg+xml');
+    const root = doc.documentElement;
+    if (!root || root.nodeName.toLowerCase() !== 'svg') return null;
+    if (doc.querySelector('parsererror')) return null;
+    return sanitized;
+  } catch {
+    return null;
+  }
+}
+
 export default function PluginIcon({ pluginName, iconFile, className }: Props) {
   const url = iconFile
     ? `/api/plugins/${encodeURIComponent(pluginName)}/assets/${encodeURIComponent(iconFile)}`
@@ -24,9 +68,11 @@ export default function PluginIcon({ pluginName, iconFile, className }: Props) {
         return r.text();
       })
       .then((text) => {
-        if (text && text.trimStart().startsWith('<svg')) {
-          svgCache.set(url, text);
-          setSvg(text);
+        if (!text) return;
+        const sanitized = sanitizeSvg(text);
+        if (sanitized) {
+          svgCache.set(url, sanitized);
+          setSvg(sanitized);
         }
       })
       .catch(() => {});
@@ -35,10 +81,6 @@ export default function PluginIcon({ pluginName, iconFile, className }: Props) {
   if (!svg) return <span className={className} />;
 
   return (
-    <span
-      className={className}
-      // SVG is fetched from the user's own installed plugin — same trust level as the plugin code itself
-      dangerouslySetInnerHTML={{ __html: svg }}
-    />
+    <span className={className} dangerouslySetInnerHTML={{ __html: svg }} />
   );
 }