Feat: add nvim support (macOS only)

[shren207]

Closes #196

Summary

test_nvim.mp4

📹 tmux session demo video

test_nvim_with_tmux.mp4

Adds Neovim as an editor target with a custom nvim:// URL handler for macOS, based on this approach.

🚨 Limitations

• macOS only
• One-time setup required — for registering nvim:// URL handler

How it works

One-time setup (user runs curl | bash)
  setup-nvim-handler.sh [--terminal=<name>]
    → Detects nvim + terminal (or uses --terminal override)
    → Creates ~/.local/bin/nvim-url-handler.sh
    → Creates ~/Applications/NvimURLHandler.app
    → Registers nvim:// URL scheme via Launch Services

Runtime (every Alt+Click)
  window.open("nvim://file/path/to/file.tsx:15:4")
    → macOS routes to NvimURLHandler.app
      → Calls nvim-url-handler.sh
        → tmux session set? → nvim --server --remote (reuse existing instance)
        → Otherwise        → open nvim in a new terminal window

Supported terminals

Terminal	Detection	Exit behavior
Ghostty	.app exists	Auto-closes (--quit-after-last-window-closed)
iTerm2	.app exists	Opens in new tab
Kitty	PATH or .app	Auto-closes (-o macos_quit_when_last_window_closed)
Terminal.app	Fallback	Auto-closes via osascript

Auto-detect priority: Ghostty > iTerm2 > Kitty > Terminal.app

Users can also specify a terminal explicitly:

curl -fsSL <script-url> | bash -s -- --terminal=kitty

Note: The curl command above points to master, so it won't work until this PR is merged. To test locally:

# from the fork
curl -fsSL https://raw.githubusercontent.com/shren207/locatorjs/feat/support-nvim/scripts/setup-nvim-handler.sh | bash

# or from a local checkout
bash scripts/setup-nvim-handler.sh

The runtime UI provides a terminal selector so users can pick their terminal and copy the correct command.

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