fix(editor): clamp paste mark range to document size in authored-tracker

[posthog]

Problem

• A user loses their paste entirely: the authored-tracker plugin owns the paste (returns true), then throws before the content lands, so nothing is inserted.
• handlePaste marks the range insertFrom + slice.size, but slice.size counts the slice's open ends. Those ends merge into the surrounding blocks when you paste multiple blocks into a paragraph, so the real inserted range is shorter than slice.size.
• With no clamp against the document size, removeMark walks past the end of the document, Fragment.nodesBetween reaches for a child that is absent, and you get TypeError: Cannot read properties of undefined (reading 'nodeSize').
• Pasting multiple blocks into a paragraph is an everyday action, so the low occurrence count more likely reflects a fresh build than a rare edge case.

Changes

• Clamp insertFrom and insertTo to tr.doc.content.size before the removeMark/addMark pair.
• This makes the paste path consistent with the typing path: appendTransaction in the same file already clamps the same way.

-        const insertFrom = tr.mapping.map(from, -1);
-        const insertTo = insertFrom + slice.size;
+        const docSize = tr.doc.content.size;
+        const insertFrom = Math.max(0, Math.min(tr.mapping.map(from, -1), docSize));
+        const insertTo = Math.max(insertFrom, Math.min(insertFrom + slice.size, docSize));

Testing

• npm test passes (74 checks).
• tsc --noEmit reports no new errors for the changed file.

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