perf: defer AI chat tool handler imports

[charlesrhoward]

Summary

• defer loading @/lib/ai-chat/tool-handlers until first tool call
• cache the loaded module and reuse it for subsequent calls
• preserve existing tool execution behavior

Validation

• pnpm build

Closes #23

---

Note

Low Risk
Change is isolated to import timing/caching in the chat UI; functional behavior should remain the same aside from potential first-call load latency or dynamic import failures.

Overview
Defers loading of @/lib/ai-chat/tool-handlers in AIChatPanel by removing static imports and dynamically importing the module on the first tool call.

Caches the imported handlers in a ref (getToolHandlers) and routes all tool executions through the cached module, preserving the existing tool-call switch behavior (including async placeImage).

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Project	Deployment	Actions	Updated (UTC)
drawit	Ready	Preview, Comment	Feb 21, 2026 9:38pm

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Avoid gating all tool calls on lazy handler chunk load

The new unconditional await getToolHandlers() runs before the switch, so even runBackgroundDiagram (which does not use @/lib/ai-chat/tool-handlers) now fails if the lazy chunk cannot be fetched (e.g., stale client after deploy or transient chunk-load/network error). In that scenario, execution jumps to the outer catch and returns an error instead of running the background-diagram path, which is a behavior regression introduced by this commit.

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