feat: Group consecutive bash tool cards

[0xSolarPunk]

Summary

• Groups adjacent bash-tool-use messages into one compact Bash card in the chat feed.
• Keeps single Bash tool-use rows on the existing renderer path.
• Preserves hidden tool-result handling so Bash calls still group when their result events sit between tool-use events.
• Adds a copy-all control for grouped commands and focused coverage for grouping behavior.

Screenshots

Desktop:

Mobile:

Validation

• bun run --cwd web test src/lib/chat/__tests__/conversation-feed-items.test.ts src/lib/components/chat/tools/__tests__/ChatToolEventRenderer.test.ts
• bun run check
• bun run test
• timeout 45s bun run start --port 0
• Screenshot server: bun server/main.js --port 0 --disable-auth on http://127.0.0.1:16850

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