Initial CodeCraft: web-based coding harness for AI models

Rust backend (axum/tokio): agent loop with streaming, tools (fs, bash,
web_fetch, todo, ask_user, subagents, skills, craft snapshots/compare),
permissions with modes and rules, Anthropic + OpenAI-compatible providers,
MCP client (stdio/HTTP, elicitation), SQLite sessions, usage statistics,
compaction, commented TOML config editable via toml_edit.

React PWA: chat with live streaming, permission/question cards, modes
(build/plan/craft), settings for providers/models/prices/MCP/permissions,
raw config editor, statistics dashboard, i18n (en/de). Docker setup.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/src/components/Diff.tsx

@@ -0,0 +1,19 @@
+export function Diff({ diff }: { diff: string }) {
+  const lines = diff.split("\n");
+  return (
+    <div className="diff">
+      {lines.map((l, i) => {
+        let cls = "";
+        if (l.startsWith("+++") || l.startsWith("---")) cls = "meta";
+        else if (l.startsWith("@@")) cls = "hunk";
+        else if (l.startsWith("+")) cls = "add";
+        else if (l.startsWith("-")) cls = "del";
+        return (
+          <div key={i} className={cls}>
+            {l || " "}
+          </div>
+        );
+      })}
+    </div>
+  );
+}