Add the ability to configure install and start commands in the Configure
panel after an app has been created. Previously these were only
configurable when first importing an app.

Changes:
- Add updateAppCommands IPC contract and handler
- Add AppCommandsSection component in ConfigurePanel
- Allow users to view, edit, and clear custom commands
- Include validation requiring both commands when customizing
- Add E2E tests for the new feature

https://claude.ai/code/session_01RHmPUNG7Bdw9MC1DKQJX8g
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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Medium Risk**
> Moderate risk because it introduces a new IPC write path that persists
user-provided command strings and affects how apps will run, though
guarded by client/server validation and locking.
> 
> **Overview**
> Adds an **App Commands** card to `ConfigurePanel` that lets users view
default vs custom install/start commands, edit them with client-side
validation (both required), cancel edits, and clear back to defaults.
> 
> Introduces a new IPC contract `updateAppCommands` plus a main-process
handler that trims inputs, enforces *both-or-neither* semantics, updates
the `apps` record under `withLock`, and triggers UI refresh/toasts.
> 
> Adds Playwright E2E coverage for configure/edit/clear flows,
validation behavior, and canceling edits.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
3f0abe3b8f9ed2483ed27d537dd874e4caa66fcf. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Let users configure custom install and start commands from the Configure
panel after an app is created. Defaults to “pnpm install && pnpm dev”
when unset, and both fields are required when customizing.

- **New Features**
- Configure, edit, or clear custom install/start commands in
ConfigurePanel.
- Added updateAppCommands IPC contract and handler to persist commands.
- E2E tests cover happy path, validation (both required), cancel, and
clear flows.

- **Bug Fixes**
- Prevent overwriting edits on refetch; fix custom commands check (AND),
and update default-state message.
- Enforce server-side validation (both commands set together or both
cleared) and remove sensitive command content from logs.

<sup>Written for commit 3f0abe3b8f9ed2483ed27d537dd874e4caa66fcf.
Summary will update on new commits.</sup>

<!-- End of auto-generated description by cubic. -->

---------
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>