feat(codex): add custom prompt composer support

[gbarros-dev]

Summary

• add Codex custom prompt discovery from project-local .codex/prompts and global CODEX_HOME / ~/.codex prompt folders
• surface custom prompts in the composer slash menu with client-side expansion before send
• preload prompts per active project and immediately send zero-arg prompts on selection when the composer has no attachments
• keep a hidden dev-only custom prompt debug banner available for local troubleshooting

Testing

• bun fmt
• bun lint
• bun typecheck
• bun run test src/lib/codexReactQuery.test.ts
• bun run test:browser -- src/components/ChatView.browser.tsx

Note

Add custom prompt composer support to Codex chat

• Adds a listCodexCustomPrompts function in codexCatalog.ts that discovers markdown prompt files from project-local .codex/prompts and a global ~/.codex directory, parsing YAML-like frontmatter for description and argument hints.
• Exposes the prompt list over WebSocket via a new codex.listCustomPrompts RPC method, served by wsServer.ts.
• Integrates custom prompts into ChatView.tsx: when the provider is codex, the composer command menu lists and filters prompts, auto-inserts argument scaffolding with cursor placement, supports Tab to move between argument fields, and immediately sends zero-argument prompts.
• On send, expands prompt invocations into final message text using shared helpers in packages/shared/src/codex.ts; parse errors surface as thread errors and block send.
• Removes the slash-command whitelist in detectComposerTrigger so arbitrary /<token> commands are recognized, enabling autocomplete for custom prompt names.

^{Macroscope summarized a56d26b.}

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[maria-rcks]

closing as not planned for now
cc @juliusmarminge