feat(sessions): add /resume slash command to open the session browser

[bl-ue]

This PR adds the /resume slash command to open the session browser that was added in #13351. This finishes the automatic saving and resuming functionality originally implemented in #4401.

Closes #13069
Closes #13070
Closes #13071

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Note: This PR is the 7th in a series of PRs that implement automatic chat recording and resuming in both interactive and non-interactive modes, with command line flags for non-interactive resuming and session management, and an interactive session browser.

PR #4401 was the original monolithic PR, which implemented this feature from the ground up. It's too large to merge as-is, however, and so it was broken up into several smaller PRs, of which this PR is the 7th.

Please see #4401's description for the full context of this PR. The original monolithic PR's description contains a detailed analysis of the entire system, with an example of the recording JSON and a demo video.

[gemini-code-assist]

Summary of Changes

Hello @bl-ue, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request finalizes the automatic chat saving and resuming feature by introducing the /resume slash command. This command provides users with an interactive way to access and manage their saved chat sessions through the session browser, enhancing the overall user experience for session management within the CLI.

Highlights

• New /resume Slash Command: Introduces a new /resume command that allows users to browse and resume previously saved chat sessions.
• Session Browser Integration: The /resume command directly opens the existing session browser UI, providing a seamless way to manage sessions.
• Completion of Auto-Saving Feature: This PR marks the completion of the automatic chat saving and resuming functionality, building upon previous work.
• UI State and Action Updates: Integrates session browser state (isSessionBrowserOpen) and actions (openSessionBrowser, closeSessionBrowser, handleResumeSession, handleDeleteSession) into the main application container and UI contexts.

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[gemini-code-assist]

Code Review

This pull request successfully adds the /resume slash command, which opens the session browser, completing a major piece of the session management functionality. The changes are well-integrated across the command loading, UI state, and component layers.

I've found one high-severity issue related to error handling. The new asynchronous handleDeleteSession action can lead to unhandled promise rejections in the SessionBrowser component because the returned promise is not handled. My review comment provides details on how to fix this to ensure errors during session deletion are caught and displayed to the user correctly.

[bl-ue]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces the /resume slash command, which opens a session browser for resuming past conversations. The implementation is well-structured, adding the new command, integrating it into the UI through a DialogManager, and providing the necessary state and action management in AppContainer. The changes also include several important bug fixes, such as correcting the u/d key handling in the session browser and using the correct identifier for session deletion. The test files have been updated accordingly to reflect these changes. Overall, the changes are of high quality and complete the intended feature. I have not found any high or critical severity issues.