feat(tui): add focused reader for completed responses

[BunsDev]

Summary

• add a focused Markdown reader for completed transcript responses, with Enter-to-read, navigation, search, copy, and a clear return path
• annotate each completed response in the transcript with its readable line count
• preserve transcript text semantics across mixed text and thinking blocks, and prevent submits while the reader is open

Test plan

• cargo test -p claurst-tui --quiet
• cargo clippy -p claurst-tui --all-targets -- -D warnings
• cargo fmt --check
• git diff --check

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Project	Deployment	Actions	Updated (UTC)
docs	Ready	Preview	Aug 15, 2026 11:48pm

[Copilot]

Pull request overview

Adds a full-screen “Response Reader” overlay in the Rust TUI so users can open completed assistant responses in a focused Markdown view with navigation, search, copy, and a clear return path, while also surfacing a per-response rendered line count in the transcript.

Changes:

• Introduces ResponseReaderState + renderer to display completed assistant text in a centered overlay.
• Adds a transcript footer (“Response · N lines · Enter to read”) for completed assistant messages with visible text, and routes Enter to open the reader when the prompt is empty.
• Integrates reader lifecycle with app event handling (blocking submit while open, closing on new streaming turn) and adds focused tests + a design spec.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src-rust/crates/tui/src/response_reader.rs	New overlay state + renderer for reading completed assistant responses (with tests).
src-rust/crates/tui/src/render.rs	Adds transcript footer + renders the reader overlay (with tests for footer targeting/line counts).
src-rust/crates/tui/src/lib.rs	Exposes the new response_reader module.
src-rust/crates/tui/src/app.rs	Adds reader state to App, routes keys (Enter/search/copy/nav), blocks submit while open, and adds tests.
src-rust/crates/cli/src/main.rs	Routes empty-prompt Enter through App so the reader open behavior works in interactive mode.
docs/superpowers/specs/2026-08-15-transcript-response-reader-design.md	Design/spec doc for behavior, scope, and validation.

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