Part of #17010. Split out from #19916 at reviewer request — this is the second of three PRs. The pyphen abstraction layer was shipped in #20145; the syllable-aware wrap mode follows in a separate PR.
Summary of the issue:

The braille word-wrap setting is a single boolean that gives users no control over how words are broken at the display edge. When a word is cut mid-way there is also no visual indication that the word continues on the next row.
Description of user facing changes:

The boolean "word wrap" checkbox in the braille settings has been replaced with a Text wrap combo box with three choices:

    Off — Wrap at the raw edge of the display, cutting words in the middle if necessary. No visual indication that a word was cut.
    Show mark when words are cut — Wrap at the raw edge, but whenever a word is cut mid-way, replace the last cell of the row with a continuation mark (braille dots 7-8) so the reader knows the word continues on the next row.
    At word boundaries — Prefer breaking at spaces. If no space fits on the row, fall back to cutting the word and showing the continuation mark.

Existing config profiles with the old setting are automatically upgraded.
Description of developer facing changes:

    BrailleTextWrapFlag feature flag enum added to config.featureFlagEnums with members DEFAULT, NONE, MARK_WORD_CUTS, AT_WORD_BOUNDARIES.
    Config schema bumped v22 → v23; old wordWrap boolean is deprecated and bridged bidirectionally to textWrap via _linkDeprecatedValues, so add-ons reading or writing the old key keep working (with a deprecation warning).
    CONTINUATION_SHAPE = 0xC0 (dots 7-8) constant added to braille.
    _WindowRowPositions frozen dataclass added to braille to hold the start/end buffer positions and continuation-mark flag for each row of the braille window, replacing the previous anonymous tuple.

Description of development approach:

The continuation mark is unified: it consistently means "a word was cut here" regardless of mode, so readers get a predictable signal.

BrailleBuffer._calculateWindowRowBufferOffsets is extended to implement all three modes. Each entry in _windowRowBufferOffsets is a _WindowRowPositions instance whose showContinuationMark field records whether that row needs a continuation mark. BrailleBuffer._get_windowBrailleCells reads that flag to insert the mark. BrailleBuffer._set_windowEndPos short-circuits space-seeking for NONE and MARK_WORD_CUTS modes (backwards scroll alignment).

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Closes #17010
Follow-up for #20146 and #20145. This is the last of three PRs replacing #19916.
Summary of the issue:

Word wrap is sometimes pretty aggressive, especially on shorter braille displays. The previous two PRs added the text wrap infrastructure and continuation marks; this PR adds the final mode that splits long words at syllable boundaries using hyphenation dictionaries.
Description of user facing changes:

A fourth option, At word or syllable boundaries, is added to the Text wrap combo box in braille settings. Like "At word boundaries", it avoids splitting words mid-way, but when a word is too long to fit on the display it additionally tries to split at a syllable boundary (using hyphenation dictionaries from the pyphen library) so less of the word spills onto the next row. NVDA marks the split with the continuation mark (braille dots 7-8).

For locales without a pyphen dictionary, the mode falls back cleanly to word-boundary behaviour without any error.
Description of developer facing changes:

    BrailleTextWrapFlag.AT_WORD_OR_SYLLABLE_BOUNDARIES member added to config.featureFlagEnums.
    Region._languageIndexes (dict[int, str]) tracks language-span boundaries within a braille region. Populated during _addFieldText and _addTextWithFields when format fields carry a language attribute or when field text is in a different language than the surrounding content.
    Region._getLanguageAtPos(pos) looks up the language at a raw-text offset using a bisect on the (always-ascending) keys of _languageIndexes.
    BrailleBuffer._getLanguageAtBufferPos(pos) delegates to the region that owns that braille cell.
    louisHelper.getTableLanguage(table) queries louis.getTableInfo for the "language" key and normalises the result, providing the default language for a region when no format-field language is known.

Description of development approach:

When AT_WORD_OR_SYLLABLE_BOUNDARIES is selected and a word straddles a row boundary, _calculateWindowRowBufferOffsets already finds the last space before the display edge. This PR adds a second pass: it looks up the full word (from that space to the next space), retrieves the language at the word's braille position, and calls textUtils.hyphenation.getHyphenPositions (introduced in #20145) to obtain candidate hyphen offsets. It then iterates the candidates from the end (closest to the display edge) and picks the first that falls within the current row, updating end accordingly and setting showContinuationMark.

Language tracking in Region ensures that the correct pyphen dictionary is selected even when a braille region contains multilingual content (e.g. a paragraph with inline foreign phrases).