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/terminal-view/terminal-panel.tsx

@@ -45,7 +45,6 @@ import { matchesShortcutWithCode } from '@/hooks/use-keyboard-shortcuts';
 import {
   getTerminalTheme,
   TERMINAL_FONT_OPTIONS,
-  DEFAULT_TERMINAL_FONT,
   getTerminalFontFamily,
 } from '@/config/terminal-themes';
 import { DEFAULT_FONT_VALUE } from '@/config/ui-font-options';
@@ -102,7 +101,6 @@ interface TerminalPanelProps {
 type XTerminal = InstanceType<typeof import('@xterm/xterm').Terminal>;
 type XFitAddon = InstanceType<typeof import('@xterm/addon-fit').FitAddon>;
 type XSearchAddon = InstanceType<typeof import('@xterm/addon-search').SearchAddon>;
-type XWebLinksAddon = InstanceType<typeof import('@xterm/addon-web-links').WebLinksAddon>;
 
 export function TerminalPanel({
   sessionId,
@@ -285,8 +283,8 @@ export function TerminalPanel({
     // - CSI sequences: \x1b[...letter
     // - OSC sequences: \x1b]...ST
     // - Other escape sequences: \x1b followed by various characters
-    // eslint-disable-next-line no-control-regex
     return text.replace(
+      // eslint-disable-next-line no-control-regex
       /\x1b\[[0-9;]*[a-zA-Z]|\x1b\][^\x07]*\x07|\x1b[()][AB012]|\x1b[>=<]|\x1b[78HM]|\x1b#[0-9]|\x1b./g,
       ''
     );
@@ -670,8 +668,6 @@ export function TerminalPanel({
           while ((match = filePathRegex.exec(lineText)) !== null) {
             const fullMatch = match[1];
             const filePath = match[2];
-            const lineNum = match[3] ? parseInt(match[3], 10) : undefined;
-            const colNum = match[4] ? parseInt(match[4], 10) : undefined;
 
             // Skip common false positives (URLs, etc.)
             if (