refactor(ui): split Message.tsx into focused per-component modules

Audit #1 — Message.tsx was a 912-line god file mixing tool-call rendering,
diff summary, wrapped text, output truncation, and message assembly. Split
into wrapped-lines, truncated-output, diff-summary, and tool-call-line so
each unit has one job. Message.tsx shrinks to 250 lines and stays focused
on assembling those primitives.

Author: halfaipg

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "codebase-cli",
-	"version": "2.0.0-pre.33",
+	"version": "2.0.0-pre.34",
 	"description": "Codebase CLI — a TypeScript coding agent on the pi-mono runtime. OAuth-aware, any LLM provider, single install.",
 	"keywords": [
 		"ai",