v1.22.0

Changes since 1.21.0:

- Read right-to-left lines back through the Unicode Bidirectional Algorithm: Hebrew and Arabic text stored in visual order comes out in reading order even when the line holds numbers, Latin phrases or punctuation; glyph-by-glyph positioned words cluster into words by the line's own gaps; presentation forms normalize to their letters once the text is in reading order (#552).
- Decode simple fonts through their `/BaseEncoding`, the Symbol and ZapfDingbats built-in encodings and their glyph names — Adobe Glyph List, `uniXXXX` and numbered `gNN`/`cidNN` names resolved against the embedded program — so symbol bullets, arrows and math operators read as the glyphs they are. A code the `/Differences` array names but cannot map reads as nothing, and a Type3 font's glyph-procedure names are never taken for glyph indexes (#553).
- Keep tracked display text whole when its letter spacing is written as `TJ` offsets, so a spaced-out title reads as words rather than one letter per word (#548).
- Add `bold_source` (where `is_bold` came from) and `fixed_pitch` to text items, and `bold_weight_threshold` to the positioned-text options; with `bold_from_weight` adjacent runs merge by the bold verdict; `is_bold_font` recognises Demi, Semibold, Ultra, Heavy and Black faces and the foundry abbreviations (#547).
- Widen the zero-area `/BBox` of Form XObjects at load so their text is extracted and the page renders; Rust gains `widen_degenerate_form_bboxes_mem(bytes)` for the repaired document (#550).
- Judge a CID-keyed font page's text decoded before calling it vector text, and bound Form XObject content inflation (#551).
- Regression fixtures for the boxes of text drawn with a reflected matrix (#549).

`bold_from_weight` and `bold_weight_threshold` stay opt-in; the default `is_bold` now also reads the weight names above as bold.

**Rust migration:** `TextItem` literals need the new `bold_source` and `fixed_pitch` fields.

Release preparation: #556.

[Full changelog](https://github.com/firecrawl/pdf-inspector/compare/v1.21.0...v1.22.0)