PDF export: warn when a PDF/X file leaves out the document's bleed

Choosing a PDF/X standard without a PDF/X preset writes a file with no bleed
(BleedBox = TrimBox) even when Document Setup sets one, and the export gave no
warning about it. The export now warns when a PDF/X file has no bleed on a side
where the document's bleed has one. The warning comes ahead of the flattening
note, because the status bar shows only the first warning. The code adds a
warning and does not change what is written.

These cases do not warn: the PDF/X presets, Use document bleed settings, a
nonzero bleed on every side the document sets, a document with no bleed, files
that aren't PDF/X files, and Export for Screens rows whose artboards Include
Bleed grows.

The warning has a row in every catalog. The Summary's warning and error rows in
the Save PDF and Print dialogs now go through the catalog, so they show its
translations.

docs/mcp.md

@@ -3210,8 +3210,9 @@ the preference `japaneseCropMarks` is on or `style: "japanese"` is given.
 PDF export draws printer's marks and bleed itself (the Save PDF dialog's Marks and Bleeds section):
 `document.exportPdf {marks: {trim, registration, colorBars, pageInfo, kind, weight, offset}, bleed: {useDocument, top,
 bottom, left, right}}`. Each page's TrimBox is its artboard, its BleedBox the artboard grown by the bleed (the
-document's with `useDocument`, set by `document.setup {bleed}`; the art there is kept) and its MediaBox the bleed box
-grown to hold the marks (the art is clipped to the bleed box). Trim marks, registration targets and the page
+document's with `useDocument`, set by `document.setup {bleed}`; the art there is kept; a PDF/X file with no bleed on a
+side where the document's bleed has one is written as asked and comes back with a warning) and its MediaBox the bleed
+box grown to hold the marks (the art is clipped to the bleed box). Trim marks, registration targets and the page
 information (title, artboard, export date in UTC) are drawn in Registration (`/Separation /All`) outside the bleed;
 the colour bars are process, spot and black-tint patches. Layers whose Print option is off (`layer.setProps
 {printable: false}`) are left out unless `includeNonPrinting` (or `createLayers`) is on.

docs/target-app-parity.md

@@ -1262,6 +1262,7 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur
     In a `.ai` opened from its editing data, an envelope made with a warp, a mesh or a top object opens as a live envelope of its contents, with its warp style, bend and distortions, its mesh points and handles or its top object's outline, its Envelope Options, its Fidelity and whether its contents are being edited. When Distort Appearance is on and the size the file saves for the contents matches their bounds with strokes, the contents map from that stroked box, until an edit in Edit Contents changes how far the strokes reach; VectorCraft's new envelopes map from the geometric box, as do contents with no width or no height, such as a single straight line. An envelope that can't be read, or that VectorCraft draws differently from the file's drawn art, keeps that drawn art, with a note. An envelope of type keeps its drawn art, with its type hidden (`crates/eps/src/import/ai/tests.rs`, `crates/eps/src/import/tests_native.rs`).
     In a `.ai` opened from its editing data, Convert to Shape on a whole path or type object opens as a live Rectangle, Rounded Rectangle or Ellipse effect with its Absolute or Relative size, its corner radius, its place among the object's effects and whether it is hidden. A relative size in the file is added to each side. A relative Ellipse, or a setting VectorCraft doesn't read, keeps the drawn art (`crates/eps/src/import/ai/style/tests.rs`, `crates/eps/src/import/ai/tests.rs`, `crates/eps/src/import/tests_native.rs`).
     PDF export and `.ai` saves write a page with a side longer than 14,400 pt with a `UserUnit` (PDF 1.6), its longer side divided by 14,400 and rounded up to the next thousandth, so that no side is longer than 14,400 units (ISO 32000-1, Annex C.2); in PDF 1.3 to 1.5 files and PDF/X files such a page is written in points.
+    PDF export warns when a PDF/X file has no bleed on a side where the document's bleed has one, and writes the file as asked.
     Placed (linked) files in a `.ai`'s editing data come in as linked images in their place, each showing the low-resolution preview the file keeps of it until its file is found or relinked in the Links panel (a file found next to the document, at its path, or in the folder the editing data names relative to the document's, such as `src/`, is read as the document opens, and its link takes that file's size, modification time and hash). A file with them no longer falls back to its PDF part, so its guides, sublayers and hidden objects open (#1264; `crates/eps/src/import/ai/tests.rs`, `crates/engine/src/tests/links.rs`). In a file opened that way, a gradient with stops in the middle runs its whole ramp across its shape and a gradient object no longer passes its fill to the next path (#1390); text objects with an appearance keep their own text and frame, type of hidden layers stays hidden, and type on later artboards lands on its text objects (#1391); area type whose frame is too short for a line of the fallback font shows its first line, the frame made taller with a warning in the open result (#1392).
     Placed (linked) files in a `.ai`'s editing data come in as linked images in their place, each showing the low-resolution preview the file keeps of it until its file is found or relinked in the Links panel (a file found next to the document or at its path is read as the document opens). A file with them no longer falls back to its PDF part, so its guides, sublayers and hidden objects open (#1264; `crates/eps/src/import/ai/tests.rs`, `crates/engine/src/tests/links.rs`). In a file opened that way, a gradient with stops in the middle runs its whole ramp across its shape and a gradient object no longer passes its fill to the next path (#1390); text objects with an appearance keep their own text and frame, type of hidden layers stays hidden, and type on later artboards lands on its text objects (#1391); area type whose frame is too short for a line of the fallback font shows its first line, the frame made taller with a warning in the open result (#1392).
     In a `.ai` or EPS opened from its editing data, and in a legacy `.ai`, each anchor is smooth or a corner as the case of the segment operator ending on it says (`l`, `c`, `v`, `y` smooth; `L`, `C`, `V`, `Y` corner), and a closed path's first anchor takes the case of the segment back to it; points and handles stay where they are. Paths, compound paths, clipping paths, guide paths, area type frames and type-on-a-path paths all keep it (`crates/eps/src/import/ai/tests.rs`, `crates/eps/src/legacy_ai/tests.rs`).