fix(console): comprehensive TUI rendering fixes

- Fix Enter key detection: handle multiple Enter key formats (\n, \r, \r\n)
- Reduce flickering: lower render frequency from 60 FPS to 30 FPS
- Fix menu bar visibility: re-render menu bar after content to prevent overwriting
- Fix content positioning: explicit line positioning for categories and commands
- Fix line shifting: clear lines before writing, control newlines manually
- Limit visible items: prevent overflow with maxVisibleCategories/Commands
- Improve CPU usage: increase sleep interval when no events processed

This fixes:
- Enter key not working for selection
- Strong flickering of the application
- Menu bar not visible or being overwritten
- Top half of selection list not displayed
- Lines being shifted/misaligned

tests/Framework/Console/CommandCategorizerTest.php

@@ -0,0 +1,152 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Framework\Console;
+
+use App\Framework\Console\CommandCategorizer;
+use App\Framework\Console\CommandList;
+use App\Framework\Console\ConsoleCommand;
+
+describe('CommandCategorizer', function () {
+    it('categorizes commands by namespace prefix', function () {
+        $commands = [
+            new ConsoleCommand('demo:hello', 'Hello command'),
+            new ConsoleCommand('demo:colors', 'Colors command'),
+            new ConsoleCommand('db:migrate', 'Migrate command'),
+            new ConsoleCommand('db:rollback', 'Rollback command'),
+        ];
+
+        $commandList = new CommandList(...$commands);
+        $categorizer = new CommandCategorizer();
+        $categories = $categorizer->categorize($commandList);
+
+        expect($categories)->toHaveKey('demo');
+        expect($categories)->toHaveKey('db');
+        expect($categories['demo'])->toHaveCount(2);
+        expect($categories['db'])->toHaveCount(2);
+    });
+
+    it('sorts categories alphabetically', function () {
+        $commands = [
+            new ConsoleCommand('zebra:command', 'Zebra command'),
+            new ConsoleCommand('alpha:command', 'Alpha command'),
+            new ConsoleCommand('beta:command', 'Beta command'),
+        ];
+
+        $commandList = new CommandList(...$commands);
+        $categorizer = new CommandCategorizer();
+        $categories = $categorizer->categorize($commandList);
+
+        $keys = array_keys($categories);
+        expect($keys)->toBe(['alpha', 'beta', 'zebra']);
+    });
+
+    it('handles commands without namespace', function () {
+        $commands = [
+            new ConsoleCommand('standalone', 'Standalone command'),
+            new ConsoleCommand('demo:hello', 'Hello command'),
+        ];
+
+        $commandList = new CommandList(...$commands);
+        $categorizer = new CommandCategorizer();
+        $categories = $categorizer->categorize($commandList);
+
+        expect($categories)->toHaveKey('standalone');
+        expect($categories)->toHaveKey('demo');
+        expect($categories['standalone'])->toHaveCount(1);
+    });
+
+    it('handles empty command list', function () {
+        $commandList = CommandList::empty();
+        $categorizer = new CommandCategorizer();
+        $categories = $categorizer->categorize($commandList);
+
+        expect($categories)->toBeEmpty();
+    });
+
+    it('groups multiple commands in same category', function () {
+        $commands = [
+            new ConsoleCommand('demo:hello', 'Hello'),
+            new ConsoleCommand('demo:colors', 'Colors'),
+            new ConsoleCommand('demo:interactive', 'Interactive'),
+            new ConsoleCommand('demo:menu', 'Menu'),
+        ];
+
+        $commandList = new CommandList(...$commands);
+        $categorizer = new CommandCategorizer();
+        $categories = $categorizer->categorize($commandList);
+
+        expect($categories['demo'])->toHaveCount(4);
+    });
+
+    it('handles commands with multiple colons', function () {
+        $commands = [
+            new ConsoleCommand('db:migrate:up', 'Migrate up'),
+            new ConsoleCommand('db:migrate:down', 'Migrate down'),
+        ];
+
+        $commandList = new CommandList(...$commands);
+        $categorizer = new CommandCategorizer();
+        $categories = $categorizer->categorize($commandList);
+
+        // Should use first part before first colon
+        expect($categories)->toHaveKey('db');
+        expect($categories['db'])->toHaveCount(2);
+    });
+
+    it('gets category description for known category', function () {
+        $categorizer = new CommandCategorizer();
+
+        expect($categorizer->getCategoryDescription('db'))->toBe('Database operations (migrations, health checks)');
+        expect($categorizer->getCategoryDescription('demo'))->toBe('Demo and example commands');
+        expect($categorizer->getCategoryDescription('cache'))->toBe('Cache management operations');
+    });
+
+    it('returns default description for unknown category', function () {
+        $categorizer = new CommandCategorizer();
+
+        expect($categorizer->getCategoryDescription('unknown'))->toBe('Various commands');
+    });
+
+    it('gets all category info', function () {
+        $categorizer = new CommandCategorizer();
+        $info = $categorizer->getCategoryInfo();
+
+        expect($info)->toBeArray();
+        expect($info)->toHaveKey('db');
+        expect($info)->toHaveKey('demo');
+        expect($info)->toHaveKey('cache');
+    });
+
+    it('handles single command in category', function () {
+        $commands = [
+            new ConsoleCommand('unique:command', 'Unique command'),
+        ];
+
+        $commandList = new CommandList(...$commands);
+        $categorizer = new CommandCategorizer();
+        $categories = $categorizer->categorize($commandList);
+
+        expect($categories)->toHaveKey('unique');
+        expect($categories['unique'])->toHaveCount(1);
+    });
+
+    it('preserves command order within category', function () {
+        $commands = [
+            new ConsoleCommand('demo:first', 'First'),
+            new ConsoleCommand('demo:second', 'Second'),
+            new ConsoleCommand('demo:third', 'Third'),
+        ];
+
+        $commandList = new CommandList(...$commands);
+        $categorizer = new CommandCategorizer();
+        $categories = $categorizer->categorize($commandList);
+
+        $demoCommands = $categories['demo'];
+        expect($demoCommands[0]->name)->toBe('demo:first');
+        expect($demoCommands[1]->name)->toBe('demo:second');
+        expect($demoCommands[2]->name)->toBe('demo:third');
+    });
+});
+