feat(web): add rightPanel.openTerminal keybinding command

[Yukaii]

Problem

There is no way to open a terminal in the right panel from the keyboard. terminal.new (mod+n, and mod+j for the drawer) only creates a right-panel terminal when focus is already inside one — the chicken-and-egg problem described in #4790. Every other surface (drawer, diff, preview) has a bindable command; the right-panel terminal did not.

Fix

Add an additive rightPanel.openTerminal command:

• packages/contracts: register rightPanel.openTerminal in STATIC_KEYBINDING_COMMANDS
• packages/shared: default binding mod+alt+j, mirroring mod+alt+b for rightPanel.toggle
• apps/web: handle the command in ChatView by calling the existing addTerminalSurface() path

Settings → Keybindings and the command-options list derive from those constants, so the new command appears there automatically and is rebindable like any other. Default bottom-drawer behavior is unchanged.

Closes #4790

Validation

• New focused test in packages/shared/src/keybindings.test.ts asserting the default binding
• Targeted tests pass (contracts keybindings, web keybindings, KeybindingsSettings.logic)
• Lint and typecheck clean for contracts, shared, and apps/web

⌘⌥J on macOS / Ctrl+Alt+J elsewhere opens a terminal as a right-panel surface.

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Note

Low Risk
Additive keybinding that reuses existing terminal-open logic; no auth, data, or drawer-behavior changes.

Overview
Adds a bindable rightPanel.openTerminal command so users can open a right-panel terminal from the keyboard without already focusing one.

Default shortcut is mod+alt+j (mirroring mod+alt+b for the right panel). ChatView handles it by calling existing addTerminalSurface(). Bottom-drawer terminal shortcuts are unchanged. Docs and a default-binding test are included.

^{Reviewed by Cursor Bugbot for commit 002f817. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Add rightPanel.openTerminal keybinding command bound to mod+alt+j

Registers the new rightPanel.openTerminal command in the keybinding contracts and sets mod+alt+j as the default shortcut. The ChatViewContent component handles the command by calling addTerminalSurface() to open a terminal. Adds corresponding tests and updates the keybindings documentation.

^{Macroscope summarized 002f817.}

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[macroscopeapp]

Approvability

Verdict: Approved at 002f817

Macroscope's review found this PR approvable — This PR adds a new keybinding command that exposes an existing function (addTerminalSurface) via keyboard shortcut. The change is purely additive, follows established patterns, includes documentation and tests, and does not modify any existing behavior.

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