Fix TUI newline display issue

- Add processEscapeSequences() function to convert literal \n to actual newlines
- Apply fix to backup success, error, and running output displays
- Add TUI binary to gitignore
- Include comprehensive documentation of the fix

Resolves issue where backup output showed literal escape sequences
instead of properly formatted text with line breaks.

docs/tui-newline-fix-summary.md

@@ -0,0 +1,64 @@
+# TUI Newline Fix Implementation Summary
+
+## Problem
+The TUI application was displaying literal `\n` characters as text strings instead of rendering them as actual line breaks in the right-hand panel when viewing backup output.
+
+## Root Cause
+Backup scripts were outputting literal escape sequences (e.g., `\n`, `\t`, `\r`) as text strings, which were being displayed directly in the TUI viewport without processing.
+
+## Solution
+Implemented a `processEscapeSequences()` helper function that converts literal escape sequences to their actual character representations before displaying content in the viewport.
+
+## Implementation Details
+
+### 1. Added Helper Function
+```go
+// Helper function to process escape sequences in output text
+func processEscapeSequences(text string) string {
+    processed := strings.ReplaceAll(text, "\\n", "\n")
+    processed = strings.ReplaceAll(processed, "\\t", "\t")
+    processed = strings.ReplaceAll(processed, "\\r", "\r")
+    return processed
+}
+```
+
+### 2. Integration Points
+The function is called in three key locations where backup output is displayed:
+
+1. **Backup Success Messages** (line ~584)
+   ```go
+   processedOutput := processEscapeSequences(msg.output)
+   ```
+
+2. **Backup Error Messages** (line ~621)
+   ```go
+   processedError := processEscapeSequences(msg.error)
+   ```
+
+3. **Running Backup Output** (line ~677)
+   ```go
+   processedOutput := processEscapeSequences(outputForDisplay)
+   ```
+
+## Testing
+- Created test scripts that generate literal escape sequences
+- Verified the fix converts `\n` to actual newlines
+- Confirmed TUI compiles and runs successfully
+- Tested with demonstration scripts
+
+## Files Modified
+- `/home/acedanger/shell/tui/main.go` - Main TUI application
+
+## Files Created for Testing
+- `/home/acedanger/shell/test-plex-backup.sh` - Test script with literal newlines
+- `/home/acedanger/shell/test-newline-fix.go` - Standalone test of the fix
+- `/home/acedanger/shell/demonstrate-newline-fix.sh` - Demonstration script
+
+## Result
+✅ **Issue Resolved**: The TUI now properly displays newlines, tabs, and carriage returns in backup output instead of showing them as literal escape sequence characters.
+
+## Usage
+The fix is automatically applied to all backup output displayed in the TUI. No user action required - the escape sequence processing happens transparently.
+
+---
+*Fix implemented on May 30, 2025*