Restructure/frontend editor (#6404)

## Move editor under `frontend/editor/`

Pure restructure: `frontend/` becomes the workspace, `frontend/editor/`
holds
  the PDF editor. 1775 file renames + 40 wiring edits. No logic changes.

  ### Why

`frontend/` is currently the editor — its `src/`, `public/`,
`src-tauri/`,
  config files all sit at the root. Promoting `frontend/` to a
workspace and putting the editor in a sibling folder leaves room for
future
apps to drop in alongside it, sharing one `package.json` /
`node_modules` /
  lint config / Storybook.

  ### What moves

  frontend/
  ├── editor/                ← NEW: everything editor-specific
  │   ├── src/               ← was frontend/src/
  │   ├── public/            ← was frontend/public/
  │   ├── src-tauri/         ← was frontend/src-tauri/
│ ├── index.html, vite.config.ts, vitest.config.ts, playwright.config.ts
  │   ├── tsconfig*.json, tailwind.config.js, postcss.config.js
  │   ├── scripts/
  │   ├── .env, .env.desktop, .env.saas
  │   └── DeveloperGuide.md
├── package.json, package-lock.json, node_modules/ ← workspace install
  ├── eslint.config.mjs, .prettierrc, .prettierignore ← shared tooling
  ├── .gitignore
  └── README.md

  ### Wiring edits (40 files)

  - `.taskfiles/frontend.yml`, `desktop.yml`, `e2e.yml`
  - `build.gradle`, `app/core/build.gradle`
- `eslint.config.mjs`, `frontend/package.json`, `.gitignore`,
`.prettierignore`
  - `docker/frontend/Dockerfile`
  - 8 `.github/workflows/*.yml`, plus `.github/dependabot.yml`,
    `.github/config/.files.yaml`, `.github/labeler-config-srvaroa.yml`
  - `scripts/translations/**`
- Docs: `AGENTS.md`, `CLAUDE.md`, `ADDING_TOOLS.md`,
`DeveloperGuide.md`,
`WINDOWS_SIGNING.md`, `devGuide/HowToAddNewLanguage.md`,
`frontend/README.md`,
    `frontend/editor/DeveloperGuide.md`

Plus 3 renamed + edited: `editor/vite.config.ts` (env path +
node_modules
  walk-up), `editor/scripts/setup-env.mts` (renamed from `.ts` for
`import.meta.url`), `editor/scripts/build-provisioner.mjs` (resolve
src-tauri
  relative to script).

  ### Verification

  | Check | Result |
  |---|---|
  | `task frontend:typecheck:all` (6 variants) | exit 0 |
  | `task frontend:lint` (eslint + dpdm) | exit 0 |
  | `task frontend:format:check` | exit 0 |
  | `task frontend:test` | 657 tests pass, 50 files |
| `task frontend:build:{core,proprietary,saas,desktop,prototypes}` | all
green |
| `task desktop:build` | full Tauri pipeline →
`Stirling-PDF_2.11.0_x64_en-US.msi` |
  | `playwright test --list --project=stubbed` | 172 tests discovered |

`task desktop:build` exercises the heaviest path — Rust + WiX + MSI
bundle
against the moved `editor/src-tauri/`. If anything in the restructure
was
  wrong it wouldn't have built.

  ### Test plan

  - [ ] `frontend-validation.yml` green
  - [ ] `e2e-stubbed.yml` green
  - [ ] `tauri-build.yml` green on at least one platform
  - [ ] `check_toml.yml` runs on a translation-touching PR

---------

Co-authored-by: Claude Opus 4.7 (1M context) <[email protected]>

frontend/editor/src/desktop/routes/Landing.tsx

@@ -0,0 +1,12 @@
+import HomePage from "@app/pages/HomePage";
+
+/**
+ * Desktop override of Landing.
+ * In desktop builds, authentication is managed entirely by AppProviders,
+ * the DesktopOnboardingModal, and the SignInModal — never by routing to /login.
+ * Always render the main app; the onboarding/sign-in modals appear on top
+ * when authentication is required.
+ */
+export default function Landing() {
+  return <HomePage />;
+}

frontend/editor/src/desktop/routes/Login.tsx

@@ -0,0 +1,14 @@
+import { Navigate } from "react-router-dom";
+
+/**
+ * Desktop override of the /login route.
+ * The legacy web login page must never appear in desktop builds — authentication
+ * is handled exclusively through the DesktopOnboardingModal and SignInModal.
+ * Any navigation to /login (e.g. from Spring Boot auth redirects) is intercepted
+ * here and immediately redirected to /.
+ * The sign-in modal is opened by the desktop httpErrorHandler before navigation
+ * occurs, so no additional dispatch is needed here.
+ */
+export default function Login() {
+  return <Navigate to="/" replace />;
+}

frontend/editor/src/desktop/routes/login/LoginHeader.tsx

@@ -0,0 +1,76 @@
+import { ActionIcon } from "@mantine/core";
+import CloseIcon from "@mui/icons-material/Close";
+import { useLogoAssets } from "@app/hooks/useLogoAssets";
+
+interface LoginHeaderProps {
+  title: string;
+  subtitle?: string;
+  centerOnly?: boolean;
+  onClose?: () => void;
+}
+
+/**
+ * Desktop override of LoginHeader.
+ * Renders icon + title + optional close button all in one row.
+ */
+export default function LoginHeader({
+  title,
+  subtitle,
+  centerOnly = false,
+  onClose,
+}: LoginHeaderProps) {
+  const { tooltipLogo } = useLogoAssets();
+
+  return (
+    <div
+      className={`login-header${centerOnly ? " login-header-centered" : ""}`}
+      style={{ marginBottom: "2rem" }}
+    >
+      <div
+        style={{
+          display: "flex",
+          alignItems: "center",
+          justifyContent: "space-between",
+          gap: "0.75rem",
+        }}
+      >
+        <div
+          style={{
+            display: "flex",
+            alignItems: "center",
+            gap: "0.6rem",
+            flex: 1,
+            minWidth: 0,
+          }}
+        >
+          <img
+            src={tooltipLogo}
+            alt="Stirling PDF"
+            style={{ width: 36, height: 36, flexShrink: 0 }}
+          />
+          {title && (
+            <h1 className="login-title" style={{ margin: 0 }}>
+              {title}
+            </h1>
+          )}
+        </div>
+        {onClose && (
+          <ActionIcon
+            onClick={onClose}
+            radius="md"
+            size={32}
+            variant="subtle"
+            style={{
+              flexShrink: 0,
+              color: "var(--text-secondary)",
+              outline: "none",
+            }}
+          >
+            <CloseIcon fontSize="small" />
+          </ActionIcon>
+        )}
+      </div>
+      {subtitle && <p className="login-subtitle">{subtitle}</p>}
+    </div>
+  );
+}