refactor(ui): cull unused UI helpers and redundant modules

tests/test_diff_viewer.py

@@ -1,11 +1,10 @@
-import pytest
+import pytest
 import tempfile
 import os
 from pathlib import Path
 from src.diff_viewer import (
   parse_diff, DiffFile, DiffHunk, parse_hunk_header, 
-  get_line_color, render_diff_text_immediate,
-  create_backup, apply_patch_to_file, restore_from_backup, cleanup_backup
+  get_line_color, apply_patch_to_file
 )
 
 def test_parse_diff_empty() -> None:
@@ -95,35 +94,6 @@ def test_get_line_color() -> None:
   assert get_line_color("@@ -1,3 +1,4 @@") == "cyan"
   assert get_line_color(" context") == None
 
-def test_render_diff_text_immediate() -> None:
-  diff_text = """--- a/test.py
-+++ b/test.py
-@@ -1 +1 @@
--old
-+new"""
-  diff_files = parse_diff(diff_text)
-  output = render_diff_text_immediate(diff_files)
-  
-  assert len(output) > 0
-  assert ("File: test.py", "white") in output
-  assert ("@@ -1 +1 @@", "cyan") in output
-  assert ("-old", "red") in output
-  assert ("+new", "green") in output
-
-def test_create_backup() -> None:
-  with tempfile.TemporaryDirectory() as tmpdir:
-    test_file = Path(tmpdir) / "test.py"
-    test_file.write_text("original content\n")
-    
-    backup_path = create_backup(str(test_file))
-    assert backup_path is not None
-    assert Path(backup_path).exists()
-    assert Path(backup_path).read_text() == "original content\n"
-
-def test_create_backup_nonexistent() -> None:
-  result = create_backup("/nonexistent/file.py")
-  assert result is None
-
 def test_apply_patch_simple() -> None:
   with tempfile.TemporaryDirectory() as tmpdir:
     test_file = Path(tmpdir) / "test.py"
@@ -158,24 +128,3 @@ def test_apply_patch_with_context() -> None:
     content = test_file.read_text()
     assert "line one" in content
     assert "line two" in content
-
-def test_restore_from_backup() -> None:
-  with tempfile.TemporaryDirectory() as tmpdir:
-    test_file = Path(tmpdir) / "test.py"
-    test_file.write_text("modified\n")
-    backup_file = test_file.with_suffix(".py.backup")
-    backup_file.write_text("original\n")
-    
-    success = restore_from_backup(str(test_file))
-    assert success
-    assert test_file.read_text() == "original\n"
-
-def test_cleanup_backup() -> None:
-  with tempfile.TemporaryDirectory() as tmpdir:
-    test_file = Path(tmpdir) / "test.py"
-    test_file.write_text("content\n")
-    backup_file = test_file.with_suffix(".py.backup")
-    backup_file.write_text("backup\n")
-    
-    cleanup_backup(str(test_file))
-    assert not backup_file.exists()