Add terminal client, memory, model fallback, version and install improvements

- codecraft: full-screen terminal client (ratatui) – local tools and files,
  models via the CodeCraft server gateway or own providers (standalone with a
  guided setup), slash commands, @files, permission dialogs, resume, update
- Static Linux CLI builds (x86_64/aarch64, cargo-zigbuild) served by the
  server: /cli/install.sh and /cli/download/<target>
- Project memory (remember tool, .codecraft/memory.md) and personal memory
- Model fallback when a host is unreachable or a budget is used up
- Version/commit in UI and health, daily release check, "What's new" dialog
- PWA: install button, maskable icon, manifest id and screenshots
- Case-insensitive detection of connection errors for retries

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

web/src/components/settings/Account.tsx

@@ -4,6 +4,8 @@ import { useT } from "../../i18n";
 import { useStore } from "../../store";
 import { GitAccount } from "./GitAccount";
 import { ApiTokens } from "./ApiTokens";
+import { CliInstall } from "./CliInstall";
+import { Memory } from "./Memory";
 
 export function Account() {
   const t = useT();
@@ -46,7 +48,9 @@ export function Account() {
       </button>
       <div style={{ fontSize: 12, color: "var(--muted)", marginTop: 8 }}>{t("account.hint")}</div>
     </div>
+    <Memory />
     <GitAccount />
+    <CliInstall />
     <ApiTokens />
     </>
   );

web/src/components/settings/CliInstall.tsx

@@ -0,0 +1,44 @@
+import { useT } from "../../i18n";
+import { toast } from "../../dialogs";
+import { Icon } from "../Icon";
+
+/** How to install and use the terminal client. */
+export function CliInstall() {
+  const t = useT();
+  const cmd = `curl -fsSL ${location.origin}/cli/install.sh | sh`;
+  const copy = (s: string) => navigator.clipboard.writeText(s).then(() => toast(t("tokens.copied"), "success"));
+  return (
+    <div className="panel">
+      <h3>
+        <Icon name="terminal" /> {t("cli.title")}
+      </h3>
+      <div className="hint" style={{ marginBottom: 10 }}>
+        {t("cli.intro")}
+      </div>
+      <ol className="cli-steps">
+        <li>
+          {t("cli.step1")}
+          <div className="row" style={{ gap: 6, marginTop: 4 }}>
+            <code className="token-value">{cmd}</code>
+            <button className="small" onClick={() => copy(cmd)}>
+              <Icon name="copy" /> {t("tokens.copy")}
+            </button>
+          </div>
+        </li>
+        <li>
+          {t("cli.step2")}
+          <div className="row" style={{ gap: 6, marginTop: 4 }}>
+            <code className="token-value">{`codecraft login ${location.origin}`}</code>
+            <button className="small" onClick={() => copy(`codecraft login ${location.origin}`)}>
+              <Icon name="copy" /> {t("tokens.copy")}
+            </button>
+          </div>
+        </li>
+        <li>{t("cli.step3")}</li>
+      </ol>
+      <div className="hint">
+        {t("cli.downloads")} <a href="/cli/download/linux-x86_64">Linux x86_64</a> · <a href="/cli/download/linux-aarch64">Linux arm64</a>
+      </div>
+    </div>
+  );
+}

web/src/components/settings/Memory.tsx

@@ -0,0 +1,34 @@
+import { useEffect, useState } from "react";
+import { get, put } from "../../api";
+import { useT } from "../../i18n";
+import { toast } from "../../dialogs";
+import { Icon } from "../Icon";
+
+/** Personal memory: preferences that apply in every project (web and terminal). */
+export function Memory() {
+  const t = useT();
+  const [text, setText] = useState<string>();
+  useEffect(() => {
+    get<{ memory: string }>("/account/memory")
+      .then((r) => setText(r.memory ?? ""))
+      .catch((e) => toast(e.message));
+  }, []);
+  if (text === undefined) return null;
+  return (
+    <div className="panel">
+      <h3>
+        <Icon name="brain" /> {t("memory.title")}
+      </h3>
+      <div className="hint" style={{ marginBottom: 8 }}>
+        {t("memory.hint")}
+      </div>
+      <textarea rows={6} style={{ width: "100%" }} value={text} placeholder={t("memory.placeholder")} onChange={(e) => setText(e.target.value)} />
+      <div className="row" style={{ marginTop: 8 }}>
+        <span className="grow" />
+        <button className="primary" onClick={() => put("/account/memory", { memory: text }).then(() => toast(t("settings.saved"), "success")).catch((e) => toast(e.message))}>
+          {t("common.save")}
+        </button>
+      </div>
+    </div>
+  );
+}