Add changesets

Author: bobsingor

.changeset/engines-tight-bounds.md

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+---
+'@embedpdf/engines': patch
+---
+
+### Extract tight glyph bounds and font size from PDFium
+
+- `readGlyphInfo` now calls `FPDFText_GetCharBox` alongside `FPDFText_GetLooseCharBox` to extract tight character bounds (closely surrounding the actual glyph shape) and maps them to device-space coordinates.
+- `buildRunsFromGlyphs` passes tight bounds through to each `PdfGlyphSlim` record (`tightX`, `tightY`, `tightWidth`, `tightHeight`) and stores per-run `fontSize` from `FPDFText_GetFontSize`.

.changeset/models-tight-bounds.md

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+---
+'@embedpdf/models': patch
+---
+
+### Tight glyph bounds and font size on run/glyph models
+
+- `PdfGlyphSlim` gains optional `tightX`, `tightY`, `tightWidth`, `tightHeight` fields for tight character bounds from `FPDFText_GetCharBox` (closely surrounding the actual glyph shape, as opposed to the existing loose bounds from `FPDFText_GetLooseCharBox`).
+- `PdfGlyphObject` gains optional `tightOrigin` and `tightSize` fields for the same purpose at the intermediate object level.
+- `PdfRun` gains an optional `fontSize` field populated from `FPDFText_GetFontSize`, used for font-size-aware rectangle merging during selection.

.changeset/selection-chrome-parity.md

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+---
+'@embedpdf/plugin-selection': patch
+---
+
+### Selection plugin: Chrome PDFium parity and geometry cache eviction
+
+**Double-click / triple-click selection**
+
+- Double-click selects the word around the clicked glyph, triple-click selects the full visual line, matching Chromium's `PDFiumEngine::OnMultipleClick` behaviour.
+
+**Drag threshold**
+
+- Pointer-down no longer immediately begins a drag-selection. The pointer must move beyond a configurable `minSelectionDragDistance` (default 3 px) before selection starts, preventing accidental selections on simple clicks.
+
+**Tolerance-based hit-testing with tight bounds**
+
+- `glyphAt` now performs two-pass hit-testing adapted from PDFium's `CPDF_TextPage::GetIndexAtPos`: an exact-match pass followed by a tolerance-expanded nearest-neighbour pass using Manhattan distance.
+- Hit-testing uses tight glyph bounds (`FPDFText_GetCharBox`) instead of loose bounds (`FPDFText_GetLooseCharBox`), matching Chrome's behaviour and preventing cross-line selection jumping on short lines. Configurable via `toleranceFactor` (default 1.5).
+
+**Font-size-aware rectangle merging**
+
+- `shouldMergeHorizontalRects` now refuses to merge runs whose font sizes differ by more than 1.5x, preventing a large character (e.g. a heading "1") from merging into adjacent body-text lines.
+- `rectsWithinSlice` sub-splits runs when the horizontal gap between consecutive glyphs exceeds 2.5x the average glyph width, mirroring Chrome's `CalculateTextRunInfoAt` character-distance heuristic.
+
+**Geometry cache eviction (LRU)**
+
+- Added `maxCachedGeometries` config option (default 50) to bound per-document geometry memory. Least-recently-used pages are evicted when the limit is exceeded; pages with active UI registrations are pinned and never evicted.
+- When an evicted page scrolls back into view and falls within an active selection, its rects are lazily recomputed and pushed to the UI.
+
+**Marquee / text-selection coordination**
+
+- Introduced `hasTextAnchor` state so the marquee handler does not activate while the text handler has a pending anchor (before the drag threshold is met).