Fix subtitle parsing, autosave and settings reset; add tests and CI

[angushushu]

Summary

Bug fixes

• The SRT parser dropped subtitle text.
  • A text line starting with a digit (e.g. "I owe you / 20 dollars.") cut off the rest of its cue.
  • Timestamps using . for milliseconds dropped the whole cue.
  • Cues are now split on blank lines. The index line is optional, cue settings after the timing are ignored, and the BOM is stripped. On a real 299-cue file the output is identical to before.
• Autosave overwrote the project.
  • With a .vat open, autosave rewrote it every 15 s, so answering No to "Save before exit?" didn't discard anything.
  • The autosave file was never deleted, so every launch offered to restore it, and restoring made the hidden file the working project.
  • Autosave now writes .<name>.autosave.vat, which records the project it belongs to. Save and discard delete it. Restore is offered only when the autosave is newer than the project, and continues on the original project.
• Failed or cancelled saves. A failed or cancelled save now keeps the window open. Before, the window closed anyway. Autosave errors go to the status bar instead of a modal dialog every 15 s.
• Cancel at the save prompt orphaned the window when opening another project or starting a new one.
• "Reset to Default" didn't reset hotkeys. A shallow copy shared the defaults' hotkeys dict, so rebinding a key rewrote the default. A settings file with only some hotkeys also lost the defaults for the rest.
• Character names with commas became two characters in the exported CSV and in CIGA. Such names are now rejected.
• A copied project folder could restore into the original project. Its hidden autosave still names the original, so an autosave is now offered only when it belongs to the project being opened (found by Copilot review).

Cleanup

• Deleted extract.py, a stale one-off script that would overwrite annotator_window.py if run, and the unused ManageCharactersDialog.
• Stopped tracking settings.json and characters.txt, which the app rewrites as you use it. characters.example.txt documents the format.
• Logos are bundled in assets/, so the app and build work outside a CIGA checkout.
• README: the clone step is cd ciga-annotator, and the launch command is python run.py (python src/main.py fails with No module named 'src').
• pyinstaller moves to requirements-dev.txt, together with pytest.

Tests and CI

• The core modules have unit tests.
• An offscreen integration test drives the real window through autosave, save, discard, cancel, failed Save As and restore.
• CI runs the tests on Windows and Linux.

Test plan

• python -m pytest: 50 passed
• Each commit passes the suite on its own
• Reintroducing the old autosave target fails 4 window tests
• CI green on this PR
• Manual: annotate a few lines, wait 15 s, kill the process, relaunch, and restore
• Manual: python build.py and launch the exe

🤖 Generated with Claude Code

[Copilot]

Copilot review overview

🟡 Changes recommended

Autosave metadata must be validated, and loaded character names must reject commas before export.

Review effort: Lite
Findings: 1

Open (1)

• Verify autosave metadata matches the selected project · New

What changed in this PR

This PR fixes subtitle parsing, autosave/recovery, settings reset, character validation, packaging, and documentation while adding tests and CI.

Changes:

• Improved SRT parsing and atomic autosave recovery.
• Corrected save/cancel flows and settings handling.
• Added validation, integration tests, cross-platform CI, and cleanup.

File	Summary
tests/​test_project.py	Project and autosave tests
tests/​test_parsers.py	SRT parsing tests
tests/​test_characters.py	Character validation tests
tests/​test_app_settings.py	Settings persistence tests
tests/​test_annotator_window.py	UI save and recovery tests
src/​ui/​char_dialog.py	Removed obsolete dialog
src/​ui/​annotator_window.py	Updated save, recovery, and validation behavior
src/​main.py	Fixed resources and window transitions
src/​core/​project.py	Added atomic project and autosave utilities
src/​core/​parsers.py	Improved SRT parsing
src/​core/​characters.py	Added character-name validation
src/​core/​app_settings.py	Fixed settings isolation and hotkey merging
settings.json	Removed tracked user state
requirements.txt	Runtime dependencies
requirements-dev.txt	Development dependencies
README.md	Updated usage instructions
pytest.ini	Configured pytest
extract.py	Removed stale script
characters.example.txt	Documented character format
build.py	Updated bundled asset paths
.gitignore	Ignored generated state
.github/​workflows/​tests.yml	Added Windows/Linux CI

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