Exploration: "Open in…" button in the terminal header, with an inline file column option

[amanfromsolan]

Idea (exploratory)

Add an "Open in…" button at the top right of the terminal header for the tab's working directory: open in Finder, editor, etc. — plus one special option, "Open inline".

Open inline shows the folder's contents in a thin column docked to the right-hand side of the terminal: one file per row, folders expandable in place. The point is agent workflows — as an AI is generating files, they appear in the column in real time and are one click away from opening. No jumping to Finder or an editor to see what just got written; the files feel present next to the session that's producing them.

Sketch

• Header, top right: Open in… ▾ → Finder / default editor / Inline.
• Inline mode: a narrow column on the terminal's right edge listing the tab's cwd. Single-row entries, expandable folders, live-updating (FSEvents on the cwd) so new files show up as they're created.
• Click a file → open with default app (or quick-look); folders expand inline.
• Per-tab state; the column follows the tab's cwd.

Notes

• The header's right side is currently the drag/zoom strip (TerminalHeaderView caps the title cluster at 80% width to preserve it), so the button needs to coexist with the drag/zoom target.
• The tab's cwd is already tracked (session.workingDirectory); live cwd changes from the shell would make the column follow cds, which is probably what you want for agent tabs.
• Adjacent ideas for context: Render markdown files inline, with links opening in a new tab #27 (render markdown inline, links open in a new tab) — an inline file column and inline markdown rendering would compose nicely.
• Exploratory: worth a design pass (widths, expand behavior, how it interacts with the peek sidebar on the left) before committing.