fix: support table alignment cells with fewer than 3 dashes (Prettier compatibility)

[mabyoungg]

Problem

Currently, is_alignment_cell expects the remaining dashes to be at least 3 characters long (len(cell) >= 3).

However, code formatters like Prettier automatically shrink table alignment cells to 1 or 2 dashes (e.g., | :-: | or | :--: |) if the column header and content are extremely short (1 or 2 characters). When this happens, the function incorrectly returns False, causing the sorting bot to treat the alignment row as a regular data row and breaking the entire table layout.

According to the GitHub Flavored Markdown (GFM) spec, an alignment cell is valid with 1 or more dashes.

Solution

• Modified the length check condition from >= 3 to >= 1 to ensure full compatibility with auto-formatters like Prettier under any header length.
• This ensures the alignment row is safely skipped during the sorting process regardless of formatting.

Thanks!