feat: Send to Terminal — selection, file, and commit refs

[jonasnobile]

Summary

Adds a "Send to Terminal" feature across the file viewer, diff viewer, and commit graph. Selecting code in either viewer reveals a floating button that pastes a path:N-M header + fenced code block into the focused terminal. Right-click menus on file-tree rows and tabs send the bare path; right-clicks on commit-hash badges and commit-graph rows send a git log-style block (hash + refs + author + relative date + indented subject).

Targets the focused terminal regardless of project (local or remote — the Terminal abstraction's transport handles routing). Always wraps payloads in DECSET 2004 brackets so multi-line content lands as one editable paste in zsh / bash / fish / Claude / Codex, instead of executing line-by-line. Strips trailing newlines so receivers don't auto-submit at end-of-paste.

Entry points

• Selection in file viewer or diff viewer → floating button → fenced code block (one per file in multi-file diff selections).
• File-tree right-click (both viewers) + tab right-click (file viewer) → "Send to Terminal" → path .
• Commit hash badge (diff viewer header + commit info bar) → right-click → menu with "Send to Terminal" + "Copy Hash".
• Commit graph row → right-click → same menu (left-click still opens the diff viewer).

Architecture

• Viewer events bubble up via existing cx.subscribe chains into a new OverlayManagerEvent::SendSelectionToActiveTerminal (for selections) or directly via a new top-level OverlayRequest::SendTextToActiveTerminal (for the commit graph, which doesn't sit under OverlayManager).
• RootView::send_text_to_active_terminal resolves the focused terminal via focus_manager.focused_terminal_state() + LayoutNode::get_at_path(), then calls Terminal::send_paste_force_bracketed().
• Pure formatting helpers live in okena-files::send_payload and okena-views-git::commit_send. Floating button extracted to okena-ui::floating_send_button.

Tests

25 new unit tests covering the four pure functions:

• markdown_lang_hint (6) — extension mapping, unknown ext fallback, multi-dot paths.
• format_send_block (5) — single-line vs range header, no-trailing-newline invariant.
• format_commit_send_text / format_commit_entry (7) — refs, full layout, multi-line message, no-trailing-newline invariant.
• build_selection_segments (7) — same-file merging, file boundaries, all-skipped, alternating files.

Notes for review

• Branch is based on a stale local main (11 commits behind origin) — there will be merge conflicts against the upstream feat: detachable file viewer and diff viewer overlays commit which touched the same files. Rebase before merging.
• Three files in crates/okena-views-git/src/diff_viewer/ (scrollbar.rs, syntax.rs, types.rs) had pre-existing local edits that aren't part of this work and were intentionally left out of the commits — they remain as uncommitted changes in the working tree.
• "Always bracket" means receivers that don't speak bracketed paste (rare modern shells, cat-style readers) will see literal \x1b[200~ and \x1b[201~ bytes. Acceptable failure mode vs. multi-line content executing line-by-line.

Test plan

• In an empty zsh terminal, right-click a commit hash in the diff viewer header and click "Send to Terminal" — block lands as one editable paste, Enter only submits when you press it.
• In a Claude/Codex terminal, same flow — block appears in the prompt as multi-line text, no auto-submit.
• Select multiple lines in the file viewer, click "Send to terminal" button — path:N-M + fenced block appears in active terminal.
• Multi-file selection in unified diff — produces one fenced block per file.
• Right-click a file in the file tree → "Send to Terminal" → just the path lands.
• Right-click a commit row in the graph popover → menu shows; "Copy Hash" copies the short hash; "Send to Terminal" pastes the block.
• No focused terminal → toast warning appears.
• Remote project → still works (uses the same terminal-registry path).
• cargo test — 25 new tests pass.

🤖 Generated with Claude Code