fix(cli): prevent empty sessions from being saved

[uinstinct]

Description

Empty sessions files are created in ~/.continue/sessions even when there are no user messages. This PR fixes that

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• [] I've read the contributing guide
• [] The relevant docs, if any, have been updated or created
• [] The relevant tests, if any, have been updated or created

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Summary by cubic

Prevents empty CLI chat sessions from being saved and adds a /sessions command to quickly view all sessions.

• Bug Fixes

  • Skip saving sessions with no content or only system messages.
  • Delay session creation; start with sessionId "" and no file until content exists.
  • Remove duplicate telemetry capture in slash commands.

• New Features

  • Added /sessions slash command to open the session selector.

^{Written for commit 0e88626. Summary will update on new commits.}

[cubic-dev-ai]

2 issues found across 6 files

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="extensions/cli/src/slashCommands.ts">

<violation number="1" location="extensions/cli/src/slashCommands.ts:177">
P2: `/sessions` emits duplicate `useSlashCommand` telemetry because it is captured globally and again inside `handleSessions`.</violation>
</file>

<file name="extensions/cli/src/services/ChatHistoryService.ts">

<violation number="1" location="extensions/cli/src/services/ChatHistoryService.ts:83">
P2: Unsafe optional chaining in initialization log can throw when `session` exists but `history` is missing.</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}

[RomneyDa]

see cubic feedback, otherwise looks good!