v0.7.70 — Reasoning-model timeout fix + welcome polish

Fixes

• *DeepSeek V4 / o1 / o3 / -thinking no longer timeout mid-thought.
  Reasoning-class models legitimately go silent for 2-5 min while thinking.
  The 90s "no activity" idle cap was killing them with a misleading
  "Provider is silent" error. Reasoning + local now share a 5 min idle
  cap; other cloud models bumped 90s → 3 min.
• EPIPE on stdout/stderr no longer surfaces a crash dialog. When
  Labaik's parent shell exits (or a background-task wrapper reaps the
  stderr FD), the next sync write threw EPIPE. Now silently dropped.

Welcome screen

• Minimalist redesign — single title, no subtitle, no shortcut footer.
• First-run starter chips replace the verbose coach card:
  🛠️ Build something · 💼 Office work · 💡 Ideate.
• Quick starts templates rebuilt around Labaik-only capabilities:
  • 🛠️ One-file app — runnable HTML artifact in the iframe
  • 💼 Budget spreadsheet — real .xlsx with formulas
  • 💡 Idea + critique — 5 niche ideas with crowned winner
• Light theme is the default again — system-follow auto-flip removed.

Action bar

Trimmed to: 📌 Pin · 💾 Save · 📋 Copy · ⎇ Branch. Removed:
👍 👎 🔊 ⚖ Compare 📝 Note ↪ Refine ↻ Regenerate. Still reachable
via the command palette.

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