Add Persian Subtitle Fixes plugin for SE5

[niksedk]

Port of msasanmh's Persian Subtitle Fixes (source/PersianErrors) to the Subtitle Edit 5 plugin contract, with a new Avalonia UI.

What's new

• Sidebar with 12 fix groups. Each group has an icon, a color, the author's Persian title, and a fix count. Click a row to turn the group on or off. The hover tooltip shows a description and a live example, and the example's result comes from the rules themselves.
• Fix cards. Each card shows the line number, the time code, chips for the groups that changed the line, and the text before → after (right to left) with the changed characters highlighted. You can filter by group, search by text or line number, and use select all / none / invert.
• Show hidden characters. ZWNJ (نیم‌فاصله) is drawn as ·, direction marks as RLE/RLM/..., and a changed line break as ↵.
• Scope. Check all lines or only the lines selected in SE.
• Apply and re-check + Undo, like ArteCheck. Enabled groups and options are remembered between runs.
• Light and dark themes follow SE.

Behaviour

• The 1,526 rules in multiple_replace.xml are unchanged and run in the same order.
• Changes go back as subtitle.paragraphs (text only), so every format is kept. With an older SE, the plugin falls back to SubRip.
• The rules expect \r\n, so text is converted for them and converted back. The line break style is kept, and the results are the same on macOS and Linux.
• One fix to the rule loader: quotes are now escaped only in regex rules. Because of that escaping, the two " + ZWNJ plain rules never matched before.

Tests

se5/PersianErrors.Tests, 32 tests:

• Rule loading
• Every group's UI example
• The README examples
• Line break style
• Diff segments
• View model: response format, unselected fixes, legacy SubRip, settings round trip, apply/undo

Checking 1,000 lines takes about 0.3 s.

Workflow: persian-errors.yml (tag se5-persian-errors-vX.Y). Index entry follows after the first release run.

🤖 Generated with Claude Code