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/theme.ts

@@ -0,0 +1,15 @@
+const KEY = "codecraft.theme";
+
+export type Theme = "system" | "dark" | "light";
+
+export function getTheme(): Theme {
+  return (localStorage.getItem(KEY) as Theme) ?? "system";
+}
+
+export function applyTheme(theme: Theme = getTheme()) {
+  localStorage.setItem(KEY, theme);
+  if (theme === "system") delete document.documentElement.dataset.theme;
+  else document.documentElement.dataset.theme = theme;
+  const dark = theme === "dark" || (theme === "system" && matchMedia("(prefers-color-scheme: dark)").matches);
+  document.querySelector('meta[name="theme-color"]')?.setAttribute("content", dark ? "#282828" : "#fbf1c7");
+}