feat: comprehensive responsive design implementation for mobile devices

This commit implements a complete responsive design overhaul making the Supervisor UI fully mobile-friendly and beautiful across all devices (320px phones to 4K displays).

## Phase 1: Mobile Navigation
- Add hamburger menu to Navbar with slide-out drawer
- Auto-close on navigation with body scroll lock
- Responsive logo sizing

## Phase 2: Touch-Friendly Buttons
- Increase touch targets to 44px on mobile (36px for small buttons)
- Add responsive button layouts in ProcessCard
- Flex-wrap prevents cramped button rows

## Phase 3: Responsive Spacing & Typography
- Add responsive padding to Card components (p-4 md:p-6)
- Scale typography across breakpoints (text-xl md:text-2xl)
- Responsive spacing in AppLayout and all pages

## Phase 4: Mobile-Friendly Tables
- Dual layout for ConfigTable: table on desktop, cards on mobile
- Preserve all data with proper formatting and wrapping
- Hide table on mobile, show card-based layout

## Phase 5: Modal Improvements
- Add horizontal padding (p-4) to all modals
- Prevent edge-touching on mobile devices
- Fixed SignalSender, KeyboardShortcutsHelp, StdinInput modals

## Phase 6: Page-Specific Layouts
- Processes page: responsive header, controls, and grid spacing
- BatchActions bar: full-width on mobile, centered on desktop
- Logs page: responsive controls and height calculations
- Config page: responsive header and error states

## Phase 7: Polish & Final Touches
- Add viewport meta tag to layout
- Responsive empty states and loading skeletons
- Consistent responsive sizing across all error messages
- Mobile-first typography scaling

🎉 Generated with [Claude Code](https://claude.com/claude-code)

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

app/logs/page.tsx

@@ -76,13 +76,13 @@ export default function LogsPage() {
 
   if (processesError) {
     return (
-      <div className="space-y-6">
-        <h1 className="text-3xl font-bold">Process Logs</h1>
+      <div className="space-y-4 md:space-y-6">
+        <h1 className="text-2xl sm:text-3xl font-bold">Process Logs</h1>
         <Card className="border-destructive/50">
-          <CardContent className="p-12 text-center">
-            <AlertCircle className="h-12 w-12 text-destructive mx-auto mb-4" />
-            <h2 className="text-xl font-semibold mb-2">Failed to load processes</h2>
-            <p className="text-muted-foreground">
+          <CardContent className="p-8 md:p-12 text-center">
+            <AlertCircle className="h-10 w-10 md:h-12 md:w-12 text-destructive mx-auto mb-4" />
+            <h2 className="text-lg md:text-xl font-semibold mb-2">Failed to load processes</h2>
+            <p className="text-sm md:text-base text-muted-foreground">
               Could not connect to Supervisor. Please check your configuration.
             </p>
           </CardContent>
@@ -92,20 +92,20 @@ export default function LogsPage() {
   }
 
   return (
-    <div className="space-y-6 h-[calc(100vh-12rem)] flex flex-col">
+    <div className="space-y-4 md:space-y-6 h-[calc(100vh-10rem)] md:h-[calc(100vh-12rem)] flex flex-col">
       <div className="flex-shrink-0">
-        <h1 className="text-3xl font-bold">Process Logs</h1>
-        <p className="text-muted-foreground mt-1">Real-time log viewing and management</p>
+        <h1 className="text-2xl sm:text-3xl font-bold">Process Logs</h1>
+        <p className="text-sm md:text-base text-muted-foreground mt-1">Real-time log viewing and management</p>
       </div>
 
       {/* Controls */}
       <Card className="flex-shrink-0">
-        <CardHeader className="pb-4">
-          <CardTitle className="text-lg">Log Controls</CardTitle>
+        <CardHeader className="pb-3 md:pb-4">
+          <CardTitle className="text-base md:text-lg">Log Controls</CardTitle>
         </CardHeader>
-        <CardContent className="space-y-4">
+        <CardContent className="space-y-3 md:space-y-4">
           {/* Process Selector */}
-          <div className="flex flex-wrap gap-4">
+          <div className="flex flex-col sm:flex-row gap-3 sm:gap-4">
             <div className="flex-1 min-w-[200px]">
               <label className="block text-sm font-medium mb-2">Select Process</label>
               <select
@@ -131,6 +131,7 @@ export default function LogsPage() {
                     variant={logType === 'stdout' ? 'default' : 'outline'}
                     size="sm"
                     onClick={() => setLogType('stdout')}
+                    className="flex-1 sm:flex-initial"
                   >
                     Stdout
                   </Button>
@@ -138,6 +139,7 @@ export default function LogsPage() {
                     variant={logType === 'stderr' ? 'default' : 'outline'}
                     size="sm"
                     onClick={() => setLogType('stderr')}
+                    className="flex-1 sm:flex-initial"
                   >
                     Stderr
                   </Button>
@@ -147,7 +149,7 @@ export default function LogsPage() {
           </div>
 
           {/* Search and Controls */}
-          <div className="flex flex-wrap gap-4 items-end">
+          <div className="flex flex-col sm:flex-row flex-wrap gap-3 sm:gap-4 items-stretch sm:items-end">
             <LogSearch value={searchTerm} onChange={setSearchTerm} />
             <LogControls
               isPlaying={isPlaying}