feat: added terminal docking to right

[atmikshetty]

What Changed

• Added a terminal dock toggle button next to the existing split terminal action in the thread terminal toolbar.
• Terminals can now be docked either:
  • below the chat view, or
  • on the right side of the chat view.
• Terminal dock position and right-dock width are persisted per thread.

Why

• The terminal could previously only be docked below the chat view, which limited layout flexibility and made it harder to use alongside the conversation in wider desktop layouts.
• The change fixes that by allowing the terminal to be docked to the right.
• Also, the dock state persists, so users won't have to manually do it every time they open the app.

UI Changes

Terminal Docked to the right:

Works when the app is minimised as well:

Redocking back to below the chat:

Small Video showing the full change:
https://github.com/user-attachments/assets/3a6f0f84-5040-4dd1-b139-7c2e94650050

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

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Note

Medium Risk
Medium risk: changes terminal layout/resizing behavior and persisted terminal state (including a storage migration), plus adds a dev-time Electron auto-install fallback that could affect launcher startup if it misfires.

Overview
Adds per-thread terminal docking so the thread terminal can live either below the chat or on the right, including a new toolbar toggle and right-docked resize behavior (width, split layout orientation, and clamping).

Persists new terminal metadata (terminalDock, terminalWidth) in terminalStateStore with a storage version bump + migration/normalization for older snapshots, and updates ChatView to render right-docked terminals inside the main layout while bottom-docked terminals remain below. Also updates tests to cover docking/width behavior.

Separately, the desktop electron-launcher now detects the "Electron failed to install correctly" case and attempts to run Electron’s install.js automatically, and marks electron as a trusted dependency in package.json.

^{Reviewed by Cursor Bugbot for commit ebf80aa. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Add right-side terminal docking with adjustable width to the terminal drawer

• ThreadTerminalDrawer gains a right-dock mode alongside the existing bottom-dock mode, with a toggle in the UI and horizontal drag-to-resize support.
• ThreadTerminalState is extended with terminalDock and terminalWidth fields; the store bumps its persistence version to 2 and migrates legacy state to apply defaults (bottom dock, 420px width).
• ChatView renders right-docked terminal drawers inside the main horizontal flex area and bottom-docked drawers below it, using normalized state from selectThreadTerminalState to determine which threads have open terminals.
• Split-pane grid orientation and terminal viewport fitting now adapt based on dock position.
• Behavioral Change: existing users' persisted terminal state is migrated on load, setting terminalDock to bottom and terminalWidth to 420 if not already present.

^{Macroscope summarized ebf80aa.}

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[macroscopeapp]

Approvability

Verdict: Needs human review

This PR adds a new user-facing feature (terminal docking to the right side) with new state management, storage migration, and UI changes across multiple components. New features introducing new behavior warrant human review regardless of implementation quality.

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