## Why
Older JediTerm versions can print the space intermediate in `DECSCUSR`,
overwriting the glyph beneath a cursor-style command.
## What changed
- Apply cursor-style commands at a repairable, terminal-owned glyph and redraw
that glyph with its original style and hyperlink before restoring the requested
cursor position.
- Omit the style command when the viewport has no safe repair anchor.
- Handle skipped cells, wide glyphs, and single-column viewports without
corrupting content or causing scrolling.
## Testing
Add cursor rendering tests for styled and cursor-only frames, skipped and wide
hyperlinked glyphs, single-column viewports, and viewports without owned cells.
GitOrigin-RevId: c8bbb74c53737b5980c533859af39da26f0e06cc
da23e131e6