chore: Fix all lint errors and remove unused code

- Fix 75 ESLint errors by updating eslint.config.mjs:
  - Add missing browser globals (MouseEvent, AbortController, Response, etc.)
  - Add Vite define global (__APP_VERSION__)
  - Configure @ts-nocheck to require descriptions
  - Add no-unused-vars rule for .mjs scripts

- Fix runtime bug in agent-output-modal.tsx (setOutput -> setStreamedContent)

- Remove ~120 unused variable warnings across 97 files:
  - Remove unused imports (React hooks, lucide icons, types)
  - Remove unused constants and variables
  - Remove unused function definitions
  - Prefix intentionally unused parameters with underscore

- Add descriptions to all @ts-nocheck comments (25 files)

- Clean up misc issues:
  - Remove invalid deprecation plugin comments
  - Fix eslint-disable comment placement
  - Add missing RefreshCw import in code-view.tsx

Reduces lint warnings from ~300 to 67 (all remaining are no-explicit-any)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/ui/src/components/views/settings-view/model-defaults/phase-model-selector.tsx

@@ -16,7 +16,6 @@ import type {
   ClaudeModelAlias,
 } from '@automaker/types';
 import {
-  stripProviderPrefix,
   STANDALONE_CURSOR_MODELS,
   getModelGroup,
   isGroupSelected,
@@ -567,7 +566,7 @@ export function PhaseModelSelector({
   const isCopilotDisabled = disabledProviders.includes('copilot');
 
   // Group models (filtering out disabled providers)
-  const { favorites, claude, cursor, codex, gemini, copilot, opencode } = useMemo(() => {
+  const { favorites, claude, codex, gemini, copilot, opencode } = useMemo(() => {
     const favs: typeof CLAUDE_MODELS = [];
     const cModels: typeof CLAUDE_MODELS = [];
     const curModels: typeof CURSOR_MODELS = [];
@@ -651,7 +650,6 @@ export function PhaseModelSelector({
     return {
       favorites: favs,
       claude: cModels,
-      cursor: curModels,
       codex: codModels,
       gemini: gemModels,
       copilot: copModels,
@@ -2117,7 +2115,7 @@ export function PhaseModelSelector({
 
           {opencodeSections.length > 0 && (
             <CommandGroup heading={OPENCODE_CLI_GROUP_LABEL}>
-              {opencodeSections.map((section, sectionIndex) => (
+              {opencodeSections.map((section, _sectionIndex) => (
                 <Fragment key={section.key}>
                   <div className="px-2 pt-2 text-xs font-medium text-muted-foreground">
                     {section.label}