Item 7 — tools were non-collapsible and "ugly-interlaced":
- ToolPart now renders COLLAPSED by default as one line: `▶ name summary (N
lines)` (summary = explicit summary / first output line / error). A ▶/▼ glyph
marks expandable tools; clicking the header toggles a left-bar block of the
full (capped) output. Running tools show `name …`; single-line/erroring tools
render inline. Compact by default → far less interlacing clutter.
- toolOutput.normalizeOutput: un-double-escapes literal \n/\t when they dominate
over real newlines (some gateway tool tails are repr'd, so newlines arrived as
backslash-n and rendered as one ugly line). Conservative — genuine multi-line
output and legit `\n`-in-code are left alone. Applied in stripToolEnvelope.
Item 3 — the input "blue tint": dropped the textarea's blue focusedBackgroundColor
and added a `❯` prompt glyph. The composer is now distinguished by structure (the
glyph + the status-bar rule above it), not a background tint.
Tests: normalizeOutput (dominant-literal vs genuine-multiline). 70 pass.
Live-smoked: `ls -la` tool → collapsed `▶ terminal total 3460 (N lines)`;
SGR-click → `▼` + clean per-line output; composer shows `❯` with no blue tint.
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