Option to render statusline inline with mode indicator (single line)

Feature request

Currently the statusline renders in its own dedicated area above the input box, and Claude Code shows the mode indicator (e.g. ▶▶ accept edits on (shift+tab to cycle)) on a separate line below it. This means two lines of vertical space are used for status/mode info.

It would be great to have an option to render the statusline colinear (on the same line) as the mode indicator — either appended to it, or with the mode indicator appended to the statusline output.

Example (today, two lines)

proj-folder <bugfix/some-bug-here *4>  Opus 4.7 (1M context) [xhigh|ctx:11%|5h:2%|wk:14%]
▶▶ accept edits on (shift+tab to cycle)

Desired (single line)

▶▶ accept edits on (shift+tab to cycle)   proj-folder <bugfix/some-bug-here *4> Opus 4.7 (1M context) [xhigh|...] 

Suggested API

A new statusLine settings key, e.g.:

{
  "statusLine": {
    "type": "command",
    "command": "~/.claude/statusline.sh",
    "inline": true
  }
}

…where inline: true would suppress the dedicated statusline row and merge it onto the mode indicator line.

Why

• Saves a row of vertical space in the terminal, which is at a premium during long sessions.
• The mode indicator and statusline are both ambient/status info — visually pairing them is natural.
• Currently the only knob in this area is hideVimModeIndicator; there's no positioning/layout option.

Thanks\!