ihasmail 2.0: rebuild as Stalwart-first JMAP webmail

Replace the FastAPI/HTMX prototype with a Node/Hono session proxy and a
React 19/Vite SPA. Mail (conversation view, search operators, labels,
sanitised HTML, privacy image proxy, invites, undo send, templates),
calendar (month/week/day/agenda, invites, free/busy, categories,
context menus), contacts (JSContact, groups, vCard), files, Sieve filter
builder (incl. filter-from-message with retroactive apply), vacation,
identities with default + Reply-To, PWA/mobile layout, push via SSE,
in-memory mock Stalwart for dev, Docker + CI.

web/src/lib/__tests__/text.test.ts

@@ -0,0 +1,27 @@
+import { describe, expect, it } from "vitest";
+import { htmlToText, quoteText, replySubject, textToHtml } from "../text";
+
+describe("text helpers", () => {
+  it("linkifies and escapes", () => {
+    const html = textToHtml("see <https://x.io/a?b=1> now");
+    expect(html).toContain("&lt;");
+    expect(html).toContain('<a href="https://x.io/a?b=1"');
+  });
+  it("colors quote levels", () => {
+    expect(textToHtml("> hi\n>> there")).toContain('class="q1"');
+    expect(textToHtml("> hi\n>> there")).toContain('class="q2"');
+  });
+  it("converts html to text", () => {
+    const t = htmlToText("<p>Hello <b>world</b></p><ul><li>one</li><li>two</li></ul><blockquote>q</blockquote><a href='https://a.b'>link</a>");
+    expect(t).toContain("Hello world");
+    expect(t).toContain("- one");
+    expect(t).toContain("> q");
+    expect(t).toContain("link <https://a.b>");
+  });
+  it("quotes and subjects", () => {
+    expect(quoteText("a\n> b")).toBe("> a\n>> b");
+    expect(replySubject("Re: Hi", "Re")).toBe("Re: Hi");
+    expect(replySubject("Fwd: Hi", "Re")).toBe("Re: Hi");
+    expect(replySubject("Hi", "Fwd")).toBe("Fwd: Hi");
+  });
+});