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/tailwind.config.js

@@ -0,0 +1,81 @@
+/** @type {import('tailwindcss').Config} */
+module.exports = {
+  content: ["./index.html", "./src/**/*.{js,ts,jsx,tsx}"],
+  darkMode: ["class", '[data-mantine-color-scheme="dark"]'],
+  theme: {
+    extend: {
+      // Use standard Tailwind color system with CSS variables for theme switching
+      colors: {
+        // Override gray to work with both themes
+        gray: {
+          50: "rgb(var(--gray-50) / <alpha-value>)",
+          100: "rgb(var(--gray-100) / <alpha-value>)",
+          200: "rgb(var(--gray-200) / <alpha-value>)",
+          300: "rgb(var(--gray-300) / <alpha-value>)",
+          400: "rgb(var(--gray-400) / <alpha-value>)",
+          500: "rgb(var(--gray-500) / <alpha-value>)",
+          600: "rgb(var(--gray-600) / <alpha-value>)",
+          700: "rgb(var(--gray-700) / <alpha-value>)",
+          800: "rgb(var(--gray-800) / <alpha-value>)",
+          900: "rgb(var(--gray-900) / <alpha-value>)",
+        },
+        green: {
+          50: "var(--color-green-50)",
+          100: "var(--color-green-100)",
+          200: "var(--color-green-200)",
+          300: "var(--color-green-300)",
+          400: "var(--color-green-400)",
+          500: "var(--color-green-500)",
+          600: "var(--color-green-600)",
+          700: "var(--color-green-700)",
+          800: "var(--color-green-800)",
+          900: "var(--color-green-900)",
+        },
+        yellow: {
+          50: "var(--color-yellow-50)",
+          100: "var(--color-yellow-100)",
+          200: "var(--color-yellow-200)",
+          300: "var(--color-yellow-300)",
+          400: "var(--color-yellow-400)",
+          500: "var(--color-yellow-500)",
+          600: "var(--color-yellow-600)",
+          700: "var(--color-yellow-700)",
+          800: "var(--color-yellow-800)",
+          900: "var(--color-yellow-900)",
+        },
+        red: {
+          50: "var(--color-red-50)",
+          100: "var(--color-red-100)",
+          200: "var(--color-red-200)",
+          300: "var(--color-red-300)",
+          400: "var(--color-red-400)",
+          500: "var(--color-red-500)",
+          600: "var(--color-red-600)",
+          700: "var(--color-red-700)",
+          800: "var(--color-red-800)",
+          900: "var(--color-red-900)",
+        },
+        // Custom semantic colors for app-specific usage
+        surface: "rgb(var(--surface) / <alpha-value>)",
+        background: "rgb(var(--background) / <alpha-value>)",
+        border: "rgb(var(--border) / <alpha-value>)",
+      },
+
+      // Z-index scale
+      zIndex: {
+        dropdown: "1000",
+        sticky: "1020",
+        fixed: "1030",
+        "modal-backdrop": "1040",
+        modal: "1050",
+        popover: "1060",
+        tooltip: "1070",
+      },
+    },
+  },
+  plugins: [],
+  // Enable preflight for standard Tailwind functionality
+  corePlugins: {
+    preflight: true,
+  },
+};