feat(darwin): add brave-browser and tailscale casks

[asktt1770]

ryoppippi の現状アプリ構成に、自分が使うアプリを追加のみ（削除なし）。

• ✅ brave-browser（cask 追加）
• ✅ tailscale（cask 追加）
• ℹ️ Slack は既に masApps (803453959) にあるため追加不要

検証：nix eval ...homebrew.casks で 25件・brave-browser/tailscale 両方含むことを確認。

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Added Brave Browser and Tailscale to the system's managed applications list.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ff094919-ee38-4921-a7ec-4d64785f3e35

📥 Commits

Reviewing files that changed from the base of the PR and between 2348ab5 and 820cd36.

📒 Files selected for processing (1)

• nix/modules/darwin/system.nix

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📝 Walkthrough

Walkthrough

Two new Homebrew cask entries, brave-browser and tailscale, are appended to the homebrew.casks list in nix/modules/darwin/system.nix. No other configuration logic or structure is modified.

Changes

Homebrew Cask Additions

Layer / File(s)	Summary
Add brave-browser and tailscale casks nix/modules/darwin/system.nix	Adds brave-browser and tailscale as new entries to the homebrew.casks list.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐇 Hippity hop, two casks appear,
A brave browser and a tailscale near,
Into the list they quietly slip,
No logic changed, just a tiny nip.
The rabbit stamps with a joyful ear! 🌟

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/customise-apps

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