Enable thinking selector in MessageEditor

- Import Select component from mini-lit and Brain icon from lucide
- Add thinkingLevel property to track current thinking level (off/minimal/low/medium/high)
- Enable showThinkingSelector (was disabled before)
- Add onThinkingChange callback for thinking level changes
- Render Select component with thinking level options when model supports reasoning
- Position thinking selector on left side next to attachment button
- Add i18n translations for Off/Minimal/Low/Medium/High in English and German
- Rename showThinking → showThinkingSelector in AgentInterface and ChatPanel for consistency
- Remove showDebugToggle property from AgentInterface (unused)
- Clean up browser-javascript tool output message (remove CSP note)

packages/browser-extension/src/tools/browser-javascript.ts

@@ -309,9 +309,7 @@ This ensures reliable execution.`,
 				);
 
 				return {
-					output:
+					output: output.trim() || "Code executed successfully (no output)",
-						output.trim() ||
-						"Code executed successfully (no output)\n\n⚠️ Note: CSP blocked direct execution. Code ran via JailJS interpreter.",
 					isError: false,
 					details: { files },
 				};

packages/web-ui/src/ChatPanel.ts

@@ -168,7 +168,7 @@ export class ChatPanel extends LitElement {
 							.session=${this.session}
 							.enableAttachments=${true}
 							.enableModelSelector=${true}
-							.enableThinking=${true}
+							.showThinkingSelector=${true}
 							.showThemeToggle=${false}
 							.showDebugToggle=${false}
 							.onApiKeyRequired=${this.onApiKeyRequired}

packages/web-ui/src/components/AgentInterface.ts

@@ -21,9 +21,8 @@ export class AgentInterface extends LitElement {
 	@property({ attribute: false }) session?: AgentSession;
 	@property() enableAttachments = true;
 	@property() enableModelSelector = true;
-	@property() enableThinking = true;
+	@property() enableThinkingSelector = true;
 	@property() showThemeToggle = false;
-	@property() showDebugToggle = false;
 	// Optional custom API key prompt handler - if not provided, uses default dialog
 	@property({ attribute: false }) onApiKeyRequired?: (provider: string) => Promise<boolean>;
 
@@ -286,7 +285,7 @@ export class AgentInterface extends LitElement {
 							.thinkingLevel=${state.thinkingLevel}
 							.showAttachmentButton=${this.enableAttachments}
 							.showModelSelector=${this.enableModelSelector}
-							.showThinking=${this.enableThinking}
+							.showThinkingSelector=${this.enableThinkingSelector}
 							.onSend=${(input: string, attachments: Attachment[]) => {
 								this.sendMessage(input, attachments);
 							}}
@@ -295,7 +294,7 @@ export class AgentInterface extends LitElement {
 								ModelSelector.open(state.model, (model) => session.setModel(model));
 							}}
 							.onThinkingChange=${
-								this.enableThinking
+								this.enableThinkingSelector
 									? (level: "off" | "minimal" | "low" | "medium" | "high") => {
 											session.setThinkingLevel(level);
 										}

packages/web-ui/src/components/MessageEditor.ts

@@ -1,9 +1,9 @@
-import { Button, html, icon } from "@mariozechner/mini-lit";
+import { Button, html, icon, Select, type SelectOption } from "@mariozechner/mini-lit";
 import type { Model } from "@mariozechner/pi-ai";
 import { LitElement } from "lit";
 import { customElement, property, state } from "lit/decorators.js";
 import { createRef, ref } from "lit/directives/ref.js";
-import { Loader2, Paperclip, Send, Sparkles, Square } from "lucide";
+import { Brain, Loader2, Paperclip, Send, Sparkles, Square } from "lucide";
 import "./AttachmentTile.js";
 import { type Attachment, loadAttachment } from "../utils/attachment-utils.js";
 import { i18n } from "../utils/i18n.js";
@@ -33,13 +33,15 @@ export class MessageEditor extends LitElement {
 
 	@property() isStreaming = false;
 	@property() currentModel?: Model<any>;
+	@property() thinkingLevel: "off" | "minimal" | "low" | "medium" | "high" = "off";
 	@property() showAttachmentButton = true;
 	@property() showModelSelector = true;
-	@property() showThinking = false; // Disabled for now
+	@property() showThinkingSelector = true;
 	@property() onInput?: (value: string) => void;
 	@property() onSend?: (input: string, attachments: Attachment[]) => void;
 	@property() onAbort?: () => void;
 	@property() onModelSelect?: () => void;
+	@property() onThinkingChange?: (level: "off" | "minimal" | "low" | "medium" | "high") => void;
 	@property() onFilesChange?: (files: Attachment[]) => void;
 	@property() attachments: Attachment[] = [];
 	@property() maxFiles = 10;
@@ -150,6 +152,10 @@ export class MessageEditor extends LitElement {
 	}
 
 	override render() {
+		// Check if current model supports thinking/reasoning
+		const model = this.currentModel;
+		const supportsThinking = model?.reasoning === true; // Models with reasoning:true support thinking
+
 		return html`
 			<div class="bg-card rounded-xl border border-border shadow-sm">
 				<!-- Attachments -->
@@ -194,7 +200,7 @@ export class MessageEditor extends LitElement {
 
 				<!-- Button Row -->
 				<div class="px-2 pb-2 flex items-center justify-between">
-					<!-- Left side - attachment and quick action buttons -->
+					<!-- Left side - attachment and thinking selector -->
 					<div class="flex gap-2 items-center">
 						${
 							this.showAttachmentButton
@@ -215,6 +221,30 @@ export class MessageEditor extends LitElement {
 									`
 								: ""
 						}
+						${
+							supportsThinking && this.showThinkingSelector
+								? html`
+									${Select({
+										value: this.thinkingLevel,
+										placeholder: i18n("Off"),
+										options: [
+											{ value: "off", label: i18n("Off"), icon: icon(Brain, "sm") },
+											{ value: "minimal", label: i18n("Minimal"), icon: icon(Brain, "sm") },
+											{ value: "low", label: i18n("Low"), icon: icon(Brain, "sm") },
+											{ value: "medium", label: i18n("Medium"), icon: icon(Brain, "sm") },
+											{ value: "high", label: i18n("High"), icon: icon(Brain, "sm") },
+										] as SelectOption[],
+										onChange: (value: string) => {
+											this.onThinkingChange?.(value as "off" | "minimal" | "low" | "medium" | "high");
+										},
+										width: "80px",
+										size: "sm",
+										variant: "ghost",
+										fitContent: true,
+									})}
+								`
+								: ""
+						}
 					</div>
 
 					<!-- Model selector and send on the right -->

packages/web-ui/src/utils/i18n.ts

@@ -108,6 +108,11 @@ declare module "@mariozechner/mini-lit" {
 		"API Key Required": string;
 		"Enter your API key for {provider}": string;
 		"The CORS proxy strips CORS headers from API responses, allowing browser-based apps to make direct calls to LLM providers without CORS restrictions. It forwards requests to providers while removing headers that would otherwise block cross-origin requests.": string;
+		Off: string;
+		Minimal: string;
+		Low: string;
+		Medium: string;
+		High: string;
 	}
 }
 
@@ -223,6 +228,11 @@ const translations = {
 		"Enter your API key for {provider}": "Enter your API key for {provider}",
 		"The CORS proxy strips CORS headers from API responses, allowing browser-based apps to make direct calls to LLM providers without CORS restrictions. It forwards requests to providers while removing headers that would otherwise block cross-origin requests.":
 			"The CORS proxy strips CORS headers from API responses, allowing browser-based apps to make direct calls to LLM providers without CORS restrictions. It forwards requests to providers while removing headers that would otherwise block cross-origin requests.",
+		Off: "Off",
+		Minimal: "Minimal",
+		Low: "Low",
+		Medium: "Medium",
+		High: "High",
 	},
 	de: {
 		...defaultGerman,
@@ -335,6 +345,11 @@ const translations = {
 		"Enter your API key for {provider}": "Geben Sie Ihren API-Schlüssel für {provider} ein",
 		"The CORS proxy strips CORS headers from API responses, allowing browser-based apps to make direct calls to LLM providers without CORS restrictions. It forwards requests to providers while removing headers that would otherwise block cross-origin requests.":
 			"Der CORS-Proxy entfernt CORS-Header aus API-Antworten und ermöglicht browserbasierte Anwendungen, direkte Aufrufe an LLM-Anbieter ohne CORS-Einschränkungen durchzuführen. Er leitet Anfragen an Anbieter weiter und entfernt Header, die sonst Cross-Origin-Anfragen blockieren würden.",
+		Off: "Aus",
+		Minimal: "Minimal",
+		Low: "Niedrig",
+		Medium: "Mittel",
+		High: "Hoch",
 	},
 };