Add devtools sidebar toggle

[ComputelessComputer]

Summary

• Add a dev-only devtools panel button to the sidebar chrome.
• Toggle the native devtools panel show and hide command from the main shell.

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Note

Low Risk
Changes are gated to dev builds and devtools UX, with coordinated events and tests; no production auth or data paths.

Overview
Adds a dev-only wrench control in the expanded sidebar timeline chrome that calls devtoolsPanelShow to open the native macOS devtools panel. The button stays visible until a panel:opened event arrives, then hides so you do not get duplicate “open” affordances while the panel is up; it returns on panel:closed, including when the panel was opened outside the sidebar (e.g. from the existing devtools host).

The native layer now broadcasts panel:opened / panel:closed from DevtoolsPanelManager on show and hide. The floating SwiftUI panel drops collapse/resize: it is always full height, and the header close (×) dismisses the panel instead of collapsing it. The web devtools action handler ignores those panel lifecycle actions so they do not trigger other devtools behaviors.

Tests mock @hypr/plugin-windows events/commands and assert button order, show invocation, and visibility tied to panel events; test-setup extends Tauri event/callback mocks so listeners work in Vitest.

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