🤖 fix: enable creation slash commands

[ammar-agent]

Summary

• centralize creation-vs-workspace command availability for suggestions and dispatch
• route creation slash commands (including /model) through shared command handling
• cover creation autocomplete filtering in slash command suggestion tests

Testing

• make static-check

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[chatgpt-codex-connector]

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Reviewed commit: 55ed9cb9c0

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[ammar-agent]

@codex review

Resolved the creation slash-command error handling by wrapping processSlashCommand with a toast + input restore on failures.

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Swish!

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