feat: add log viewer components and fix build issues

- Add LogViewer component with syntax highlighting and auto-scroll
- Add LogControls for play/pause, auto-scroll, refresh, download, clear
- Add LogSearch component with search highlighting
- Add Input UI component
- Fix TypeScript type issues in ProcessCard and types.ts
- Fix XML-RPC client type issues
- Add force-dynamic to layout to prevent SSR issues with client components
- Add mounted state to Navbar for theme toggle hydration
- Add custom 404 page

Components added:
- components/logs/LogViewer.tsx - Main log viewer with real-time display
- components/logs/LogControls.tsx - Control panel for log viewing
- components/logs/LogSearch.tsx - Search input for filtering logs
- components/ui/input.tsx - Reusable input component

Fixes:
- ProcessStateCode type casting in ProcessCard
- XML-RPC client options type (use any to avoid library type issues)
- canStartProcess/canStopProcess type assertions
- Dynamic rendering to prevent SSR hydration issues

🤖 Generated with Claude Code (https://claude.com/claude-code)

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

components/layout/Navbar.tsx

@@ -1,5 +1,6 @@
 'use client';
 
+import { useState, useEffect } from 'react';
 import Link from 'next/link';
 import { usePathname } from 'next/navigation';
 import { Moon, Sun, Activity } from 'lucide-react';
@@ -16,8 +17,13 @@ const navItems = [
 
 export function Navbar() {
   const pathname = usePathname();
+  const [mounted, setMounted] = useState(false);
   const { theme, setTheme, resolvedTheme } = useTheme();
 
+  useEffect(() => {
+    setMounted(true);
+  }, []);
+
   const toggleTheme = () => {
     setTheme(resolvedTheme === 'dark' ? 'light' : 'dark');
   };
@@ -52,18 +58,20 @@ export function Navbar() {
         </div>
 
         {/* Theme Toggle */}
-        <Button
-          variant="ghost"
-          size="icon"
-          onClick={toggleTheme}
-          aria-label="Toggle theme"
-        >
-          {resolvedTheme === 'dark' ? (
-            <Sun className="h-5 w-5" />
-          ) : (
-            <Moon className="h-5 w-5" />
-          )}
-        </Button>
+        {mounted && (
+          <Button
+            variant="ghost"
+            size="icon"
+            onClick={toggleTheme}
+            aria-label="Toggle theme"
+          >
+            {resolvedTheme === 'dark' ? (
+              <Sun className="h-5 w-5" />
+            ) : (
+              <Moon className="h-5 w-5" />
+            )}
+          </Button>
+        )}
       </div>
     </nav>
   );

components/logs/LogControls.tsx

@@ -0,0 +1,75 @@
+'use client';
+
+import { Play, Pause, RotateCcw, Download, Trash2 } from 'lucide-react';
+import { Button } from '@/components/ui/button';
+import { cn } from '@/lib/utils/cn';
+
+interface LogControlsProps {
+  isPlaying: boolean;
+  onPlayPause: () => void;
+  autoScroll: boolean;
+  onToggleAutoScroll: () => void;
+  onRefresh: () => void;
+  onClear?: () => void;
+  onDownload?: () => void;
+  isClearing?: boolean;
+}
+
+export function LogControls({
+  isPlaying,
+  onPlayPause,
+  autoScroll,
+  onToggleAutoScroll,
+  onRefresh,
+  onClear,
+  onDownload,
+  isClearing = false,
+}: LogControlsProps) {
+  return (
+    <div className="flex items-center gap-2">
+      <Button
+        variant={isPlaying ? 'destructive' : 'success'}
+        size="sm"
+        onClick={onPlayPause}
+        title={isPlaying ? 'Pause auto-refresh' : 'Resume auto-refresh'}
+      >
+        {isPlaying ? <Pause className="h-4 w-4" /> : <Play className="h-4 w-4" />}
+        {isPlaying ? 'Pause' : 'Play'}
+      </Button>
+
+      <Button
+        variant={autoScroll ? 'default' : 'outline'}
+        size="sm"
+        onClick={onToggleAutoScroll}
+        title={autoScroll ? 'Disable auto-scroll' : 'Enable auto-scroll'}
+      >
+        Auto-scroll
+      </Button>
+
+      <Button variant="outline" size="sm" onClick={onRefresh} title="Refresh logs now">
+        <RotateCcw className="h-4 w-4" />
+        Refresh
+      </Button>
+
+      {onDownload && (
+        <Button variant="outline" size="sm" onClick={onDownload} title="Download logs">
+          <Download className="h-4 w-4" />
+          Download
+        </Button>
+      )}
+
+      {onClear && (
+        <Button
+          variant="destructive"
+          size="sm"
+          onClick={onClear}
+          disabled={isClearing}
+          title="Clear logs"
+        >
+          <Trash2 className={cn('h-4 w-4', isClearing && 'animate-spin')} />
+          Clear
+        </Button>
+      )}
+    </div>
+  );
+}

components/logs/LogSearch.tsx

@@ -0,0 +1,36 @@
+'use client';
+
+import { Search, X } from 'lucide-react';
+import { Input } from '@/components/ui/input';
+import { Button } from '@/components/ui/button';
+
+interface LogSearchProps {
+  value: string;
+  onChange: (value: string) => void;
+  placeholder?: string;
+}
+
+export function LogSearch({ value, onChange, placeholder = 'Search logs...' }: LogSearchProps) {
+  return (
+    <div className="relative flex-1 max-w-md">
+      <Search className="absolute left-3 top-1/2 -translate-y-1/2 h-4 w-4 text-muted-foreground" />
+      <Input
+        type="text"
+        placeholder={placeholder}
+        value={value}
+        onChange={(e) => onChange(e.target.value)}
+        className="pl-9 pr-9"
+      />
+      {value && (
+        <Button
+          variant="ghost"
+          size="sm"
+          onClick={() => onChange('')}
+          className="absolute right-1 top-1/2 -translate-y-1/2 h-7 w-7 p-0"
+        >
+          <X className="h-4 w-4" />
+        </Button>
+      )}
+    </div>
+  );
+}

components/logs/LogViewer.tsx

@@ -0,0 +1,119 @@
+'use client';
+
+import { useEffect, useRef, useState } from 'react';
+import { Card, CardContent } from '@/components/ui/card';
+import { cn } from '@/lib/utils/cn';
+
+interface LogViewerProps {
+  logs: string;
+  isLoading?: boolean;
+  autoScroll?: boolean;
+  searchTerm?: string;
+}
+
+export function LogViewer({ logs, isLoading, autoScroll = true, searchTerm = '' }: LogViewerProps) {
+  const scrollRef = useRef<HTMLDivElement>(null);
+  const [userHasScrolled, setUserHasScrolled] = useState(false);
+
+  // Auto-scroll to bottom when logs update (if enabled and user hasn't manually scrolled)
+  useEffect(() => {
+    if (autoScroll && !userHasScrolled && scrollRef.current) {
+      scrollRef.current.scrollTop = scrollRef.current.scrollHeight;
+    }
+  }, [logs, autoScroll, userHasScrolled]);
+
+  // Detect user scroll
+  const handleScroll = () => {
+    if (!scrollRef.current) return;
+
+    const { scrollTop, scrollHeight, clientHeight } = scrollRef.current;
+    const isAtBottom = Math.abs(scrollHeight - clientHeight - scrollTop) < 10;
+
+    setUserHasScrolled(!isAtBottom);
+  };
+
+  // Highlight search term
+  const highlightSearchTerm = (text: string) => {
+    if (!searchTerm) return text;
+
+    const regex = new RegExp(`(${searchTerm})`, 'gi');
+    const parts = text.split(regex);
+
+    return parts.map((part, i) =>
+      regex.test(part) ? (
+        <mark key={i} className="bg-warning/30 text-warning-foreground">
+          {part}
+        </mark>
+      ) : (
+        part
+      )
+    );
+  };
+
+  // Syntax highlighting for log levels
+  const formatLogLine = (line: string, index: number) => {
+    const errorRegex = /(ERROR|FATAL|CRITICAL)/i;
+    const warnRegex = /(WARN|WARNING)/i;
+    const infoRegex = /(INFO|DEBUG)/i;
+
+    let className = '';
+    if (errorRegex.test(line)) {
+      className = 'text-destructive';
+    } else if (warnRegex.test(line)) {
+      className = 'text-warning';
+    } else if (infoRegex.test(line)) {
+      className = 'text-accent';
+    }
+
+    return (
+      <div key={index} className={cn('font-mono text-xs leading-relaxed', className)}>
+        {highlightSearchTerm(line)}
+      </div>
+    );
+  };
+
+  const logLines = logs.split('\n').filter((line) => {
+    if (!searchTerm) return true;
+    return line.toLowerCase().includes(searchTerm.toLowerCase());
+  });
+
+  return (
+    <Card className="h-full">
+      <CardContent className="p-0 h-full">
+        <div
+          ref={scrollRef}
+          onScroll={handleScroll}
+          className="h-full overflow-auto p-4 bg-muted/30 rounded-lg"
+        >
+          {isLoading ? (
+            <div className="flex items-center justify-center h-full">
+              <div className="animate-spin h-8 w-8 border-4 border-primary border-t-transparent rounded-full" />
+            </div>
+          ) : logLines.length === 0 ? (
+            <div className="flex items-center justify-center h-full text-muted-foreground">
+              {searchTerm ? 'No logs matching search term' : 'No logs available'}
+            </div>
+          ) : (
+            <div className="space-y-0.5">
+              {logLines.map((line, index) => formatLogLine(line, index))}
+            </div>
+          )}
+
+          {!autoScroll && userHasScrolled && (
+            <button
+              onClick={() => {
+                setUserHasScrolled(false);
+                if (scrollRef.current) {
+                  scrollRef.current.scrollTop = scrollRef.current.scrollHeight;
+                }
+              }}
+              className="fixed bottom-20 right-8 px-4 py-2 bg-primary text-primary-foreground rounded-lg shadow-lg hover:bg-primary/90 transition-colors text-sm font-medium"
+            >
+              Scroll to bottom
+            </button>
+          )}
+        </div>
+      </CardContent>
+    </Card>
+  );
+}

components/process/ProcessCard.tsx

@@ -4,7 +4,7 @@ import { Play, Square, RotateCw, Activity } from 'lucide-react';
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
 import { Button } from '@/components/ui/button';
 import { Badge } from '@/components/ui/badge';
-import { ProcessInfo, getProcessStateClass, formatUptime, canStartProcess, canStopProcess } from '@/lib/supervisor/types';
+import { ProcessInfo, ProcessStateCode, getProcessStateClass, formatUptime, canStartProcess, canStopProcess } from '@/lib/supervisor/types';
 import { useStartProcess, useStopProcess, useRestartProcess } from '@/lib/hooks/useSupervisor';
 import { cn } from '@/lib/utils/cn';
 
@@ -36,7 +36,7 @@ export function ProcessCard({ process }: ProcessCardProps) {
           <Badge
             className={cn(
               'ml-2',
-              getProcessStateClass(process.state),
+              getProcessStateClass(process.state as ProcessStateCode),
               'border px-3 py-1 font-mono text-xs'
             )}
           >
@@ -77,7 +77,7 @@ export function ProcessCard({ process }: ProcessCardProps) {
             size="sm"
             variant="success"
             onClick={handleStart}
-            disabled={!canStartProcess(process.state) || isLoading}
+            disabled={!canStartProcess(process.state as ProcessStateCode) || isLoading}
             className="flex-1"
           >
             <Play className="h-4 w-4" />
@@ -87,7 +87,7 @@ export function ProcessCard({ process }: ProcessCardProps) {
             size="sm"
             variant="warning"
             onClick={handleStop}
-            disabled={!canStopProcess(process.state) || isLoading}
+            disabled={!canStopProcess(process.state as ProcessStateCode) || isLoading}
             className="flex-1"
           >
             <Square className="h-4 w-4" />

components/ui/input.tsx

@@ -0,0 +1,27 @@
+import { InputHTMLAttributes, forwardRef } from 'react';
+import { cn } from '@/lib/utils/cn';
+
+export interface InputProps extends InputHTMLAttributes<HTMLInputElement> {}
+
+const Input = forwardRef<HTMLInputElement, InputProps>(
+  ({ className, type, ...props }, ref) => {
+    return (
+      <input
+        type={type}
+        className={cn(
+          'flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm',
+          'ring-offset-background file:border-0 file:bg-transparent file:text-sm file:font-medium',
+          'placeholder:text-muted-foreground',
+          'focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2',
+          'disabled:cursor-not-allowed disabled:opacity-50',
+          className
+        )}
+        ref={ref}
+        {...props}
+      />
+    );
+  }
+);
+Input.displayName = 'Input';
+
+export { Input };