Add business dashboard dark mode from Super Admin theme setting.

Login and in-app surfaces follow tenant themeMode, matching customer dark tokens, with themed switches and tighter card/table chrome.

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/PROJECT_CONTEXT.md

@@ -3,7 +3,7 @@
 > **For AI agents:** Read this file at the start of a new chat before making changes.  
 > Update this document when a major feature is completed or architecture changes.
 
-Last updated: August 21, 2026
+Last updated: August 31, 2026
 
 ---
 
@@ -471,7 +471,7 @@ Match **Super Admin** compact field sizing across all dashboards — see `.curso
 Global input sizing lives in `packages/dashboard-core/src/styles/tokens.css` (customer) and each app’s `index.css` (business / super-admin). Change password → shared `PasswordResetModal` from `@meshkee/dashboard-ui`.
 
 - **Farsi text:** Customer app → Yekan Bakh (`src/fonts/yekanbakh.css`); business/super-admin → IranYekan (`iranyekan.css`). `--font-en` / `--font-fa` are named faces only; `--font-ui` appends system fallbacks. Self-host files in `public/fonts/` — see `.cursor/rules/ui-farsi-fonts.mdc`
-- **Per-business theme:** Super Admin sets `branding.primaryColor`; business app applies via `BusinessThemeProvider`
+- **Per-business theme:** Super Admin sets `branding.primaryColor` and `branding.themeMode` (`light` \| `dark`); business + customer dashboards apply both via their theme providers (`data-theme` on `<html>`). Dark mode uses neutral gray surfaces; `--primary` stays for accents only.
 - **Per-business modules:** Super Admin **Modules** column on Businesses list; stored in `settings.modules.enabled` (business + customer sections); business Home + Sidebar hide disabled business modules; `customer_products` gates customer My Products (`/my-products`, `/my-products/new`) which call `businesses/:id/my-user-products`
 - **RTL:** Farsi inputs use `dir="rtl"` and the app’s `--font-fa`
 - **IRT prices:** comma-separated thousands + `IRT` suffix — see `.cursor/rules/ui-irt-price.mdc`