Add e2e tests for commit diff

NOTES.md

@@ -86,6 +86,10 @@ Need to have `gg` built first! - disable the tests temporally.
 
 `GG_PATH="$(realpath ./result/bin/gg)" nix develop --command bash -c "cd e2e-tests; pytest -vvv"`
 
+While developing a tests, to add all screenshots:
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+`rm e2e-tests/screenshots/test_XXX_*; GG_PATH="$(realpath ./result/bin/gg)" nix develop --command bash -c "cd e2e-tests; pytest -vvv -k test_XXX --add-screenshots"; cat e2e-tests/screenshots/test_XXX_*`
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e2e-tests/screenshots/test_diff_001

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+dda83ecb 👀 Add test_a                                                             test <test@mail.com> 1970-01-01 00:00
+1751c62d Initial commit                                                            test <test@mail.com> 1970-01-01 00:00
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+Add test_a 📝1 ➕︎3 ➖︎0                                                          dda83ecbf53d1133b7ed45455cdb279904d61b2d
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+Author:    test <test@mail.com>                                                                                         
+Date:      1970-01-01 00:00                                                                                             
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+✨📄test_a                                                                                                              
+ ...║                                                                                                                   
+  │1║line 1                                                                                                             
+  │2║line 2                                                                                                             
+  │3║line 3                                                                                                             
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+On main                                                                                                                 

e2e-tests/screenshots/test_diff_002

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+62c8499c 👀 Modify test_a: modify line                                             test <test@mail.com> 1970-01-01 00:00
+dda83ecb Add test_a                                                                test <test@mail.com> 1970-01-01 00:00
+1751c62d Initial commit                                                            test <test@mail.com> 1970-01-01 00:00
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+Author:    test <test@mail.com>                                                                                         
+Date:      1970-01-01 00:00                                                                                             
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+📝test_a, ✏️  66% similar                                                                                                
+ ... ║                                                                                                                  
+ 1│ 1║line 1                                                                                                            
+ 2│  ║line 2                                                                                                            
+  │ 2║mod line                                                                                                          
+ 3│ 3║line 3                                                                                                            
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+On main                                                                                                                 

e2e-tests/screenshots/test_diff_003

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+6360b5bf 👀 Modify test_a: add lines                                               test <test@mail.com> 1970-01-01 00:00
+62c8499c Modify test_a: modify line                                                test <test@mail.com> 1970-01-01 00:00
+dda83ecb Add test_a                                                                test <test@mail.com> 1970-01-01 00:00
+1751c62d Initial commit                                                            test <test@mail.com> 1970-01-01 00:00
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+Modify test_a: add lines 📝1 ➕︎2 ➖︎0                                            6360b5bf649701755748f3bac70b43129564d63f
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+Author:    test <test@mail.com>                                                                                         
+Date:      1970-01-01 00:00                                                                                             
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+📝test_a, ✏️  75% similar                                                                                                
+ ...║                                                                                                                   
+ 1│1║line 1                                                                                                             
+ 2│2║mod line                                                                                                           
+ 3│3║line 3                                                                                                             
+  │4║line 4                                                                                                             
+  │5║line 4                                                                                                             
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+On main