Bump Claude Agent SDK and add Opus 4.7 models

[aletc1]

Summary

• Bumps @anthropic-ai/claude-agent-sdk from 0.2.45 to 0.2.112 and the bundled Claude Code CLI from 2.1.45 to 2.1.112 (Opus 4.7 support requires CLI ≥ 2.1.111).
• Updates the model picker to match Claude Code's own UX: Opus 4.7, Opus 4.7 1M, Sonnet 4.6, Haiku 4.5.
• The 1M variant uses the opus[1m] alias — Claude Code parses the suffix and enables a 1M-token context window on the same underlying Opus 4.7 model (it's not a separate model ID).

Why

The previous picker showed Opus 4.6 while Anthropic has shipped Opus 4.7 (current flagship) with a native 1M-token context window. The old SDK and bundled CLI predated Opus 4.7 support.

Files changed

• package.json — SDK version + claude:download script versions
• src/renderer/features/agents/lib/models.ts — picker entries
• src/renderer/features/agents/atoms/index.ts — MODEL_ID_MAP passthrough for opus[1m]
• src/renderer/features/agents/ui/agent-context-indicator.tsx — CONTEXT_WINDOWS entry for the 1M variant (1,000,000)
• bun.lock — regenerated

Notes for reviewers

• Opus 4.6 is intentionally dropped from the picker to match the Claude Code reference UX. The underlying model remains available via the API if needed, but is no longer a first-class option here.
• The existing opus alias still auto-routes to the latest Opus; only the display label changed (4.6 → 4.7).
• Effort levels (low/medium/high/xhigh/max) visible in the Claude Code CLI reference are out of scope and would require a separate UI + SDK parameter pass-through.
• Pre-existing TypeScript drift in src/main/lib/trpc/routers/claude.ts (unrelated to this change) became visible after bun install refreshed the lockfile from 0.2.32 to the declared version. It does not block the build (esbuild via electron-vite) and is not introduced by this PR.

Test plan

• bun install — SDK 0.2.112 installed
• bun run claude:download — 2.1.112 CLI binary downloaded (SHA verified)
• bun run build — main + preload + renderer build cleanly
• bun run dev — Electron app boots, auth + protocol handlers init without errors
• Open the model picker and confirm entries: Opus 4.7 · Opus 4.7 1M · Sonnet 4.6 · Haiku 4.5
• Select Opus 4.7, send a message, confirm response streams and tool calls render
• Switch to Opus 4.7 1M mid-chat, send another message, confirm it still works
• Send a message on Sonnet 4.6 and Haiku 4.5
• Session resume works on a second turn (proves resume/continue option shape is unchanged)

🤖 Generated with Claude Code