FAIL

1. `C:/Users/zhang/Documents/Github/Ely-GPUI-Components/src/documents/document/tables.rs:268` — `insert_table` splits CRLF when the caret is between its two bytes. Reproduction through the public document API: open `Intro\r\nNext\r\n` in Source mode, focus the editor, press End, then call `insert_table`. End places the caret at byte 6; `line_start` and `line_end` treat that position as an empty line. The result is `Intro\r\r\n<table>\r\n\nNext\r\n`, introducing bare CR and LF instead of preserving CRLF around the inserted table, contrary to §14.3. Treat CRLF as one boundary when resolving the insertion line, including a caret on its LF, and add a regression using the editor's End action. Evidence: `.work/R4.8-r2-review/probes.log`, test `review_r48r2_insert_after_end_key_keeps_crlf`.