[twarp 07b] Claude Code panel: main-pane host + claude-at-submit trigger

[timomak]

Summary

Sub-phase 7b of feature 07 (Claude Code panel). Per the main-pane re-spec (#70, merged), this relocates the Claude Code chat renderer that #69 landed in the left sidebar into a first-class main-content pane, adds the claude-at-submit terminal trigger that opens it, and deletes the #69 sidebar host.

Nothing new is re-introduced from a branch: the crates/claude_code driver and the ported transcript renderer are already on master (via #69). This PR moves the renderer into a pane and wires the entry point.

What changed

New pane type (IPaneType::ClaudeCode), modeled on the simplest existing non-persisted pane (NetworkLogPane/NetworkLogView):

• app/src/claude_code_view.rs — the [twarp 07b] Claude Code panel: panel shell + ported transcript #69 renderer, repurposed as a BackingView (ClaudeCodeView). The transcript + docked composer are the pane body; the "Claude Code" + cwd header moves to render_header_content. Every render leaf (markdown body, code block, message rows, the synthetic source) is unchanged from [twarp 07b] Claude Code panel: panel shell + ported transcript #69. (File is a git mv of claude_code_panel/mod.rs so history is preserved.)
• app/src/pane_group/pane/claude_code_pane.rs — ClaudeCodePane (PaneContent), the thin wrapper around PaneView<ClaudeCodeView>.
• IPaneType::ClaudeCode enum/Display/render arm + PaneId::from_claude_code_pane_{ctx,view} factories.
• LeafContents::ClaudeCode — non-persisted (a restored pane can't replay a live claude; twarp keeps no transcript store — session restore is claude --resume, 7h). Handled in is_persisted, restore_pane_leaf, sqlite::save_pane_state, launch_config, vertical_tabs.

Terminal trigger (claude at submit → open the pane), mirroring the existing OpenCodeInWarp/OpenFileInWarp chain exactly:

• Input::try_execute_command_from_source intercepts a bare top-level claude before the PTY write. Detection is conservative (PRODUCT §3): tokenized with warp_completer::parsers::simple::top_level_command (no hand-rolled shell parsing) — pipelines, &&/; chains, subshells, and full paths are not intercepted; if claude isn't on PATH it's not intercepted (the shell's own error stands, §4); only CommandExecutionSource::User submissions qualify.
• Emits Event::OpenClaudeCodePane { args, cwd } through input::Event → handle_input_event → view::Event → handle_terminal_view_event → pane_group::Event → Workspace::open_claude_code_pane.
• The intercepted block shows a brief toast ("Opened Claude Code in a pane.") so the command isn't silently swallowed (§1), and the input is cleared.

Sidebar host deleted (the #69 placement the owner rejected): the ToolPanelView::ClaudeCode tab, toolbelt button, LeftPanelAction::ClaudeCode, LeftPanelDisplayedTab::ClaudeCode persistence, the WorkspaceAction::ToggleClaudeCodePanel / CustomAction action, and the ⌘⌥K binding are all removed.

Provisional decisions (flagged for review)

• Placement: the pane opens as a focused split in the active tab's group via add_pane_with_direction(Direction::Right, …) — exactly what TECH §The pane prescribes and identical to how open_network_log_pane works. PRODUCT §load-bearing-2 marks "new tab vs split vs replace" as open; happy to switch to a genuine new top-level tab if preferred.
• Inline note: implemented as a toast (the precedent already in try_execute_command_from_source). Can move to an in-block banner if you'd rather it live in the scrollback.
• Args/cwd: forwarded through the event now (so 7c needn't re-plumb). In 7b the source is synthetic: a claude <prompt> seeds the first synthetic turn; cwd shows in the header.

Testing

• cargo check -p warp — 0 errors, 0 warnings.
• cargo clippy -p warp — clean.
• cargo fmt --check on all changed files — clean.
• cargo test -p claude_code — 19/19 pass (the kept driver crate is unchanged).
• Conservative detection (§3) delegates to warp_completer's top_level_command, which already has test_top_level_command covering the piped/chained/path cases; the smoke test below exercises the edges manually.

Fork CI ends "cancelled" (no matrix runners), so the gates above are the local presubmit-equivalent.

Smoke test (7b — no live claude session needed)

1. In a terminal, run claude → a Claude Code pane opens in the main content area and is focused; the terminal block shows a brief "Opened Claude Code in a pane" note and does not run raw claude.
2. The pane shows the chat layout: a transcript area and a docked composer at the bottom. Type a message and press Enter → it renders as a user turn and a sample assistant reply renders as themed Markdown (heading, list, inline code, a fenced code block, a link) — not plain text.
3. Run claude fix the bug → the pane opens with "fix the bug" already rendered as the first user turn (synthetic reply follows).
4. Resize/split the pane; open a second Claude Code pane in another tab — both behave like normal panes; the tab title reads "Claude Code".
5. Confirm conservative detection runs these raw (no pane): echo hi | claude, echo x && claude, /usr/bin/claude (full path), claudia.
6. Temporarily remove claude from PATH and run claude → twarp does not intercept (the shell shows command-not-found). Restore claude.
7. The left sidebar no longer has a Claude Code tab, and ⌘⌥K no longer toggles a chat.

🤖 Generated with Claude Code