fix(render): clip extracted text to the page CropBox (#2670)

[jonathanwxh-cell]

What this changes

Part of #2670 (item 5: Text outside the CropBox).

When a page's CropBox is smaller than its MediaBox, hayro::render_into clips visual rendering to page.intersected_crop_box() transformed by page.initial_transform(true), but TextDevice recorded every glyph drawn anywhere on the page without checking whether its view-space bounding box intersected the visible crop region. As a result, pdfcraft-cli text, text_extract, text_search, and the UI text layer extracted and matched hidden text outside the CropBox.

• Store the view-space visible page box (initial.transform_rect_bbox(intersected_crop_box)) on TextDevice in extract_page_filtered.
• In TextDevice::draw_glyph, skip glyphs whose view-space bounding box has no positive overlap with self.page (b.x0.max(self.page.x0) >= b.x1.min(self.page.x1) || b.y0.max(self.page.y0) >= b.y1.min(self.page.y1)), while keeping glyphs that lie inside or straddle the CropBox boundary.

How you verified it

• cargo fmt --all -- --check
• cargo clippy -p pdfcraft-render -p pdfcraft-cli --all-targets -- -D warnings
• cargo test -p pdfcraft-render --lib text::
• cargo test -p pdfcraft-cli --test text
• cargo xtask layers
• cargo xtask assets
• Added unit test text::tests::text_outside_the_crop_box_is_clipped in crates/render/src/text.rs covering text and /ActualText inside vs outside all four CropBox edges, glyphs straddling the CropBox edge, rotations (0, 90, 180, 270), /UserUnit (1, 2), and zero-area/disjoint CropBoxes.
• Added CLI integration test page_argument_tests::text_clips_glyphs_outside_the_crop_box in apps/pdfcraft-cli/tests/text.rs.

Never-crash

• No unwrap() / expect() / panic!() / todo!() / unimplemented!() / unreachable!() added in library code.
• Total floating-point bounds check on already-finite glyph and page rectangles.

Provenance

• Clean-room implementation from PDF specification (CropBox clipping in ISO 32000-2 §7.7.3.3 / §14.11.2) and synthetic test fixtures.