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/i18n/en.ts

@@ -387,6 +387,29 @@ export const en = {
   "tokens.noExpiry": "No expiry",
   "tokens.days": "days",
   "tokens.create": "Create token",
+  "cli.title": "Terminal client",
+  "cli.intro": "Work with CodeCraft in your terminal like with Claude Code: the agent edits files and runs commands on your machine, while models, modes and rules come from this server (costs show up in your statistics). It can also run without a server using your own API keys.",
+  "cli.step1": "Install (Linux, x86_64 and arm64):",
+  "cli.step2": "Sign in with your CodeCraft account:",
+  "cli.step3": "Start it in a project folder with `codecraft`. Inside: /help, /model, /mode, Shift+Tab switches the mode, @ adds files. `codecraft update` updates it.",
+  "cli.downloads": "Direct downloads:",
+  "memory.title": "Personal memory",
+  "memory.hint": "What every agent should know about you – in all projects, in the web and in the terminal client (language, code style, tools you prefer …). Project facts are kept per project in .codecraft/memory.md.",
+  "memory.placeholder": "e.g. Answer in German. I prefer TypeScript and Rust. Never commit without asking.",
+  "memory.remembered": "Remembered",
+  "whatsnew.title": "What's new in {version}",
+  "update.available": "Update {version} available",
+  "settings.version": "Version",
+  "settings.fallback": "Fallback",
+  "settings.fallbackHint": "Used automatically when this model's host is unreachable or its provider budget is used up",
+  "install.label": "App",
+  "install.installed": "Installed",
+  "install.button": "Install CodeCraft as an app",
+  "install.hint.chrome": "Chrome on Android: menu ⋮ → “Install app” (or “Add to home screen” → Install). If only a shortcut appears, the server must be reachable from the internet for Google to build the app.",
+  "install.hint.samsung": "Samsung Internet: menu → “Add page to” → “Home screen”.",
+  "install.hint.firefox": "Firefox can't install web apps – open CodeCraft in Chrome (Android) or use “Add to home screen”.",
+  "install.hint.ios": "Safari: Share button → “Add to Home Screen”. Push notifications work only in the installed app.",
+  "install.hint.desktop": "Chrome/Edge: install icon in the address bar or menu → “Install CodeCraft”.",
   "new.title": "New session",
   "new.directory": "Project directory",
   "new.up": "Up",