[niksedk]

Adds Batch convert support (SubtitleEdit/subtitleedit#16036) to the SE5 Remove Unicode characters plugin.

What it does

• plugin.json: "batch": true.
• batch (headless, all lines): replaces only the characters in a batch list; every other character is kept. Paragraph requests return paragraphs in the source format (styles/actors etc. kept); legacy requests fall back to SubRip. Nothing to change → ok without subtitle. Settings are not returned.
• configure: the window opens in a settings-only state: a "Batch convert settings" panel, the batch list as rows (count/lines columns hidden), an Add box that takes pasted glyphs or U+XXXX codes (for invisible characters like U+200B), and an opt-in "Also remove every other non-ANSI character". OK is always enabled and returns settings + settingsVersion, no subtitle. Cancel → cancelled.

The judgement call: batch default

The window preselects every detected character with a blank replacement, i.e. "remove all above U+00FF". Doing that unattended would wipe Cyrillic, Greek, CJK, curly quotes, dashes, ellipses etc. from whole folders, so batch does not mirror the window's preselection here:

• Until Configure is used, the batch list = built-in defaults (♪, ♫ → #) plus every non-blank replacement the user typed in the window. Blank window entries are ignored, because the window saves a blank entry for every row shown, including rows the user left unchecked, so a blank is no proof the user wants that character removed.
• Once configured, the list is exactly what was saved. The SE4-style "remove everything" behaviour is available only as an explicit Configure option.
• The batch list and option are saved under separate keys (batchReplacements, batchRemoveOthers); a normal run keeps them but ignores them, and Configure keeps the window's replacements.

SE 5.3 compatibility

Old SE ignores batch and only sends run; the run path is unchanged (the only difference is that the saved settings now also carry the batch keys through).

Tests

• New se5/RemoveUnicodeCharacters.Tests (xUnit, modelled on FixEncodingErrors.Tests) with BatchModeTests (9 tests): defaults-only batch, nothing-to-change, blank window entries ignored, configured list, remove-others, legacy SubRip, settings round-trips both ways, U+XXXX parsing.
• The workflow gets a test job (build depends on it) and the Tests path filter.
• End-to-end: ran the built dll with a batch request.json → exit 0, ♪ Привет ♫ → # Привет #, don’t → don't (saved replacement).
• Not verified: the Configure window and the run window were not opened by hand (no headless UI run).

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