fix(gui): remove unused TypeScript variables in AI & Chat components

Clean up unused TypeScript variables flagged by TS6133 in AI and Chat related components per AGENT9.md analysis:

- FeedbackDialog.tsx: Remove unused import encodeSystemInfoForUrl
- FormatterSelector.tsx: Remove unused imports (createEffect, LSPFormatterProvider, LanguageFormatters, useEditor)
- NotebookDiff.tsx: Remove unused index parameter in For loop
- NotebookEditor.tsx: Prefix unused position parameter with underscore
- Notification.tsx: Remove unused index parameter in For loop
- AIOnboarding.tsx: Remove unused stepLabels variable and prefix unused step parameter

Author: factorydroid

cortex-gui/src/components/FeedbackDialog.tsx

@@ -1,7 +1,7 @@
 import { Show, For, createSignal, createEffect, onMount, onCleanup } from "solid-js";
 import { Icon } from "./ui/Icon";
 import { useToast } from "@/context/ToastContext";
-import { collectSystemInfo, formatSystemInfo, encodeSystemInfoForUrl, type SystemInfo } from "@/utils/systemInfo";
+import { collectSystemInfo, formatSystemInfo, type SystemInfo } from "@/utils/systemInfo";
 import { getLogs, copyLogsToClipboard, openInBrowser, isTauri } from "@/utils/tauri";
 import { invoke } from "@tauri-apps/api/core";
 

cortex-gui/src/components/FormatterSelector.tsx

@@ -9,9 +9,8 @@
  * - Prompts user when multiple formatters are available
  */
 
-import { createSignal, createEffect, Show, For, createMemo, onMount, onCleanup } from "solid-js";
-import { useFormatter, type FormatterType, type LSPFormatterProvider, type LanguageFormatters } from "@/context/FormatterContext";
-import { useEditor } from "@/context/EditorContext";
+import { createSignal, Show, For, createMemo, onMount, onCleanup } from "solid-js";
+import { useFormatter, type FormatterType } from "@/context/FormatterContext";
 import { Icon } from "./ui/Icon";
 
 /** Display names for built-in formatters */

cortex-gui/src/components/Notification.tsx

@@ -246,7 +246,7 @@ export function Notification(props: NotificationProps) {
               }}
             >
               <For each={props.notification.actions}>
-                {(action, index) => (
+                {(action) => (
                   <button
                     style={{
                       width: "fit-content",

cortex-gui/src/components/notebook/NotebookDiff.tsx

@@ -498,7 +498,7 @@ function SideBySideDiffLines(props: { changes: Change[] }) {
       }}
     >
       <For each={lines()}>
-        {(pair, index) => (
+        {(pair) => (
           <>
             <div
               class="px-2 py-0.5 border-r"

cortex-gui/src/components/notebook/NotebookEditor.tsx

@@ -2402,7 +2402,7 @@ export function NotebookEditor(props: NotebookEditorProps) {
   };
 
   // Search navigation and replacement handlers
-  const navigateToCell = (cellId: string, position?: { line: number; column: number }) => {
+  const navigateToCell = (cellId: string, _position?: { line: number; column: number }) => {
     setActiveCellId(cellId);
 
     // Scroll the cell into view

cortex-gui/src/components/onboarding/AIOnboarding.tsx

@@ -290,21 +290,12 @@ function StepIndicator(props: {
   steps: OnboardingStep[]; 
   currentStep: OnboardingStep;
 }) {
-  const stepLabels: Record<OnboardingStep, string> = {
-    welcome: "Welcome",
-    provider: "Provider",
-    apiKey: "API Key",
-    features: "Features",
-    tips: "Tips",
-    complete: "Complete",
-  };
-
   const currentIndex = () => props.steps.indexOf(props.currentStep);
 
   return (
     <div class="flex items-center justify-center gap-2 mb-6">
       <For each={props.steps}>
-        {(step, index) => (
+        {(_step, index) => (
           <div class="flex items-center">
             <div
               class={`flex items-center justify-center w-8 h-8 rounded-full text-xs font-medium transition-colors ${