The quoteInlineStyleContext used an empty stylePrefix, so after inline
elements (links, bold, code) closed their ANSI codes inside a blockquote,
the quote color was not re-applied. Text following a link rendered in
default foreground instead of the quote theme color.
Headings applied styling (bold+cyan) as an outer wrapper around the
result of renderInlineTokens. When inline elements like codespan emitted
ANSI resets, the outer heading style was killed and only the default
text style was restored via stylePrefix.
Fix: pass a heading-specific InlineStyleContext into renderInlineTokens
so each text segment gets heading styling directly, and stylePrefix
restores heading style after inline elements.
fullRender wrote \x1b[3J\x1b[2J\x1b[H (clear scrollback, then clear
screen). But \x1b[2J pushes on-screen content into scrollback, undoing
the preceding \x1b[3J. Reorder to \x1b[2J\x1b[H\x1b[3J so the screen is
cleared first and scrollback is wiped last.
0x08 (BS) was treated as plain backspace alongside 0x7f (DEL). On
Windows Terminal, Backspace sends 0x7f and Ctrl+Backspace sends 0x08,
making ctrl+backspace bindings unreachable.
Now 0x08 matches ctrl+backspace (and ctrl+h, same byte) but not plain
backspace. 0x7f remains plain backspace.
fixes#2139