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/CommandResultProcessorTest.php

@@ -0,0 +1,103 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Framework\Console;
+
+use App\Framework\Console\CommandResultProcessor;
+use App\Framework\Console\ExitCode;
+use App\Framework\Console\Result\TextResult;
+use App\Framework\DI\DefaultContainer;
+use Tests\Framework\Console\Helpers\TestConsoleOutput;
+
+describe('CommandResultProcessor', function () {
+    beforeEach(function () {
+        $this->container = new DefaultContainer();
+        $this->output = new TestConsoleOutput();
+        $this->processor = new CommandResultProcessor($this->container, $this->output);
+    });
+
+    it('processes ConsoleResult', function () {
+        $result = TextResult::success('Test output');
+        $exitCode = $this->processor->process($result);
+
+        expect($exitCode)->toBe(ExitCode::SUCCESS);
+        expect($this->output->getOutput())->toContain('Test output');
+    });
+
+    it('renders ConsoleResult to output', function () {
+        $result = TextResult::success('Rendered message');
+        $this->processor->process($result);
+
+        expect($this->output->getOutput())->toContain('Rendered message');
+    });
+
+    it('processes ExitCode directly', function () {
+        $exitCode = $this->processor->process(ExitCode::SUCCESS);
+
+        expect($exitCode)->toBe(ExitCode::SUCCESS);
+    });
+
+    it('processes different ExitCode values', function () {
+        expect($this->processor->process(ExitCode::GENERAL_ERROR))->toBe(ExitCode::GENERAL_ERROR);
+        expect($this->processor->process(ExitCode::COMMAND_NOT_FOUND))->toBe(ExitCode::COMMAND_NOT_FOUND);
+        expect($this->processor->process(ExitCode::INVALID_INPUT))->toBe(ExitCode::INVALID_INPUT);
+    });
+
+    it('processes legacy int return values', function () {
+        $exitCode = $this->processor->process(0);
+
+        expect($exitCode)->toBe(ExitCode::SUCCESS);
+        expect($exitCode->value)->toBe(0);
+    });
+
+    it('converts int to ExitCode', function () {
+        expect($this->processor->process(1))->toBe(ExitCode::GENERAL_ERROR);
+        expect($this->processor->process(64))->toBe(ExitCode::COMMAND_NOT_FOUND);
+    });
+
+    it('handles invalid return types', function () {
+        $exitCode = $this->processor->process('invalid');
+
+        expect($exitCode)->toBe(ExitCode::GENERAL_ERROR);
+    });
+
+    it('handles null return type', function () {
+        $exitCode = $this->processor->process(null);
+
+        expect($exitCode)->toBe(ExitCode::GENERAL_ERROR);
+    });
+
+    it('handles array return type', function () {
+        $exitCode = $this->processor->process([]);
+
+        expect($exitCode)->toBe(ExitCode::GENERAL_ERROR);
+    });
+
+    it('handles object return type', function () {
+        $exitCode = $this->processor->process(new \stdClass());
+
+        expect($exitCode)->toBe(ExitCode::GENERAL_ERROR);
+    });
+
+    it('processes ConsoleResult with different exit codes', function () {
+        $successResult = TextResult::success('Success');
+        expect($this->processor->process($successResult))->toBe(ExitCode::SUCCESS);
+
+        $errorResult = TextResult::error('Error');
+        expect($this->processor->process($errorResult))->toBe(ExitCode::FAILURE);
+    });
+
+    it('renders multiple ConsoleResults correctly', function () {
+        $result1 = TextResult::success('First message');
+        $result2 = TextResult::success('Second message');
+
+        $this->processor->process($result1);
+        $this->output->clear();
+        $this->processor->process($result2);
+
+        expect($this->output->getOutput())->toContain('Second message');
+        expect($this->output->getOutput())->not->toContain('First message');
+    });
+});
+