v0.3.1

TUI rendering hotfix — two pre-existing UX bugs found during the 0.3.0
end-to-end smoke (long-reply truncation + new-message scroll-off). Both
affect all providers (Anthropic, OpenAI-compatible, Static). Render-only,
no API / trait / contract changes.

Fixed

• Conversation pane truncated long messages at the panel's right border instead of wrapping. New wrap_message helper (src/tui/mod.rs) word-wraps each message by chars().count() (UTF-8 char-safe) to the panel's inner width, preserves existing \n as hard breaks, and hard-splits absurdly long words. One message stays one ListItem so Selection / Visual navigation (app.selected_index → app.messages[i]) is unchanged.
• Conversation pane did not auto-scroll when new messages overflowed the bottom. New effective_selection / effective_highlight_symbol helpers pin the last message as the selected row in Normal mode (ratatui's List auto-scrolls to keep the selected item visible) while suppressing the ">> " highlight prefix so the pin is invisible. Selection / Visual modes still show the prefix and use the user-chosen index.
• Streaming tail of a tall response stayed off-screen (and on some terminals "jumped/reset" when the message exceeded the conversation pane). The follow-tail fix now tail-truncates the rendered last message in Normal mode to its trailing viewport_inner_height wrapped lines, so streaming visibly scrolls line-by-line. Selection / Visual modes still render every wrapped line so the full message remains reviewable via Ctrl+S → ↑.

Added

• 15 new tests covering the four render-time helpers (wrap_message: word wrap normal / multibyte / oversized word / embedded newlines / width-0 / empty; effective_selection: follow-tail in Normal mode / chosen index in Selection / Visual / empty messages; effective_highlight_symbol: by mode; tail_lines: keeps last N / unchanged when max≥len / max=0 no-op / empty / shift-by-one streaming tick). Total tests: 136 (was 121).

Known limitations

• Leading indentation and internal whitespace runs are collapsed when a message is wrapped. wrap_message uses split_whitespace, which drops leading spaces and multi-space gaps. Markdown bullets like " - item" render as "- item"; preformatted blocks lose alignment. Tracked for a follow-up patch (preserve per-line indentation via a different tokenizer).
• Wrap width is measured in chars().count(), not terminal display width. CJK / emoji glyphs that occupy two cells will wrap one column early; combining marks may wrap one column late. Tracked for a follow-up that switches to unicode-width.

Full Changelog: v0.3.0...v0.3.1