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/config/billing.ts

@@ -0,0 +1,73 @@
+/**
+ * Billing Configuration for Desktop
+ * Single source of truth for billing-related constants
+ */
+
+export const BILLING_CONFIG = {
+  // Credits included in Free plan (per month)
+  FREE_CREDITS_PER_MONTH: 50,
+
+  // Credits included in Pro plan (per month)
+  INCLUDED_CREDITS_PER_MONTH: 500,
+
+  // Overage pricing (per credit) - also fetched dynamically from Stripe
+  OVERAGE_PRICE_PER_CREDIT: 0.05,
+
+  // Credit warning threshold (shows low-balance indicator)
+  LOW_CREDIT_THRESHOLD: 10,
+
+  // Threshold at which plan pricing is preloaded (higher than LOW_CREDIT_THRESHOLD
+  // so prices are ready before the warning UI appears)
+  PLAN_PRICING_PRELOAD_THRESHOLD: 20,
+
+  // Stripe lookup keys
+  PRO_PLAN_LOOKUP_KEY: "plan:pro",
+  METER_LOOKUP_KEY: "meter:overage",
+
+  // Display formats
+  CURRENCY_SYMBOLS: {
+    gbp: "£",
+    usd: "$",
+    eur: "€",
+    cny: "¥",
+    inr: "₹",
+    brl: "R$",
+    idr: "Rp",
+    jpy: "¥",
+  } as const,
+} as const;
+
+/**
+ * Get current billing configuration
+ */
+export function getBillingConfig() {
+  return BILLING_CONFIG;
+}
+
+/**
+ * Format overage price with currency symbol
+ * @param currency Currency code (e.g., 'usd', 'gbp')
+ * @param price Optional price override (defaults to BILLING_CONFIG.OVERAGE_PRICE_PER_CREDIT)
+ */
+export function getFormattedOveragePrice(
+  currency: string = "usd",
+  price?: number,
+): string {
+  const symbol =
+    BILLING_CONFIG.CURRENCY_SYMBOLS[
+      currency.toLowerCase() as keyof typeof BILLING_CONFIG.CURRENCY_SYMBOLS
+    ] || "$";
+  const amount = price ?? BILLING_CONFIG.OVERAGE_PRICE_PER_CREDIT;
+  return `${symbol}${amount.toFixed(2)}`;
+}
+
+/**
+ * Get currency symbol from currency code
+ */
+export function getCurrencySymbol(currency: string): string {
+  return (
+    BILLING_CONFIG.CURRENCY_SYMBOLS[
+      currency.toLowerCase() as keyof typeof BILLING_CONFIG.CURRENCY_SYMBOLS
+    ] || currency.toUpperCase()
+  );
+}