[ARE404]

Summary

Adds the remaining built-in quick launcher tools as ordinary plugins, on top of the calculator contract from #6743. Each tool is its own UI package under plugins/application, on by default and switchable under Settings > Plugins.

Tool	Trigger	Return
Symbols	sym, symbol, 符号 + term	Copy the character and close
Quick library: snippets, notes, links	Item name; notes also search full text via note; name text fills {query} in a link	Copy and close, or open the link
Applications (macOS)	App name	Open
File search (macOS)	f, file, 文件 + at least 2 characters	Open
Clipboard history (macOS)	cb, clipboard, 剪贴板	Copy and close
Screen region (macOS)	screenshot, capture, 截图	Close the popup, select a region, copy the image

The launcher now lists all tools in a scroll area showing 8 rows, keeps the selected row visible and pins Ask Maka below the list. Quick library content is managed on its own settings page; the popup only searches and acts, and stays a single layer.

The native parts are in-process calls on ApplicationHost, built with the normal Cargo and Maka.app flow. There is no helper binary, legacy plugin runtime, import-legacy.mjs or migration. Commits are split per tool to make review easier.

Refs #6707

Review focus

• products/maka/workbench/src/bindings/quick_tools.rs: mdfind, open and screencapture are macOS system tools started from Rust. File search is limited to the home folder, skips ~/Library and dot folders, and is bounded by a 4 s timeout, 256 KB of output and 6 results.
• Clipboard history polls NSPasteboard.changeCount once a second, skips concealed, transient and auto-generated content and text over 100000 bytes, keeps 50 entries and is memory-only.
• Tools appear in composition order with a limit per tool. There is no global ranking across tools.
• Known limits: applications match bundle file names, so localized app names do not match. Symbols have no icons, and Traditional Chinese input searches the Simplified terms.

Verification

• just typecheck and just build pass.
• node --test products/maka/workbench/tests/*.test.mjs: 120 pass, 0 fail, including 8 new quick tool behavior tests.
• npm --prefix products/maka/bundle run test, cargo test -p maka-workbench --lib quick_tools, biome format, license headers and the Rust dependency and notices checks pass.
• macOS, real popup driven through accessibility tools, with a local patch keeping the popup open on launch (not included here):
  • sym lists symbols, and Down scrolls the list to keep the selection visible.
  • Saving, editing and two-step deleting library items works, and items survive a restart. A javascript: link is rejected.
  • Return on a snippet copies it (confirmed with pbpaste) and closes the popup.
  • <link name> hello world shows a link row, and Return closes the popup.
  • Calculator shows the app, and Return launches it and closes the popup.
  • f readme lists home folder results without ~/Library. cb lists text copied after launch. 截图 shows the capture row. hello shows no tool rows.

Not run:

• Completing a region capture, including the popup closing before selection.
• Return on a file result. It uses the same open_local_path call as applications.
• The URL the browser received for a link. Expansion is covered by tests only.
• Skipping concealed clipboard content in practice.
• Windows and Linux, where the native tools are not offered.

Observed: the Quick Library entry sits at the top of the Settings rail, above Connections and Models. I left the rail order alone.

AI use

Select exactly one:

• No generative tool made a substantive contribution
• Generative tooling made a substantive contribution

Tool(s) and scope: Claude Code helped with implementation and debugging under the author's direction.

Checklist

• Tests cover the change and fail without it (parsing, ranking and native filtering are covered by tests, popup behavior was verified manually)
• Format, typecheck and the affected suites pass locally

Does this PR entail a change in behavior?

• Yes — described under Summary above
• No