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/components/SetupWizard/desktopOAuth.css

@@ -0,0 +1,96 @@
+/* Desktop-specific OAuth button styles for self-hosted server connections */
+/* These styles are isolated from the web SSO buttons to prevent conflicts */
+
+.oauth-container-vertical-desktop {
+  display: flex;
+  flex-direction: column;
+  gap: 0.875rem; /* 14px */
+  align-items: stretch;
+}
+
+.oauth-button-vertical-desktop {
+  width: 100%;
+  display: flex;
+  align-items: center;
+  justify-content: flex-start;
+  padding: 0.75rem 1rem; /* 12px 16px */
+  border: 1px solid #d1d5db;
+  border-radius: 0.75rem; /* 12px */
+  background-color: var(--auth-card-bg-light-only);
+  font-size: 1rem; /* 16px */
+  font-weight: 500;
+  color: var(--auth-text-primary-light-only);
+  cursor: pointer;
+  gap: 0.75rem; /* 12px */
+  font-family: inherit;
+  transition: background-color 0.2s ease;
+}
+
+.oauth-button-vertical-desktop:hover:not(:disabled) {
+  background-color: #f3f4f6;
+}
+
+.oauth-button-vertical-desktop:disabled {
+  cursor: not-allowed;
+  opacity: 0.6;
+}
+
+.oauth-button-vertical-desktop:focus-visible {
+  outline: 2px solid var(--auth-border-focus-light-only);
+  outline-offset: 2px;
+}
+
+/* Fix Mantine Button internal spans */
+.oauth-button-vertical-desktop .mantine-Button-inner {
+  width: 100%;
+  display: flex;
+  align-items: center;
+  justify-content: flex-start;
+}
+
+.oauth-button-vertical-desktop .mantine-Button-label {
+  width: 100%;
+  display: flex;
+  align-items: center;
+  justify-content: flex-start;
+  gap: 0.75rem;
+  overflow: visible;
+}
+
+.oauth-button-left-desktop {
+  display: flex;
+  align-items: center;
+  gap: 0.75rem;
+  min-width: 0;
+  flex: 1 1 auto;
+}
+
+.oauth-button-text-desktop {
+  font-size: 1rem;
+  font-weight: 500;
+  color: inherit;
+  line-height: 1.2;
+  display: inline-flex;
+  align-items: center;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.oauth-icon-wrapper-desktop {
+  width: 1.25rem; /* 20px */
+  height: 1.25rem; /* 20px */
+  border-radius: 0;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  background: transparent;
+  border: none;
+}
+
+.oauth-icon-tiny-desktop {
+  width: 1.25rem; /* 20px */
+  height: 1.25rem; /* 20px */
+  display: block;
+  flex-shrink: 0;
+}