Fixed styling guidance in CLAUDE.md and frontend rules.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.claude/rules/frontend.md

@@ -6,6 +6,7 @@ paths:
   - "src/app.rs"
   - "src/validator.rs"
   - "style/**"
+  - "assets/css/**"
 ---
 
 # Frontend rules
@@ -44,6 +45,6 @@ paths:
 ## Styling
 
 - UI is the Bootstrap-based admin template in `assets/vendor/` plus Boxicons (`<i class="bx bx-...">`). Reuse its classes (`card`, `table`, `btn btn-primary`, `form-control`, `row`/`col`) before writing CSS.
-- Custom styles go to `style/main.scss`. Never edit `assets/vendor/`.
+- Custom styles go to a CSS file in `assets/css/` and must be linked with `<Link rel="stylesheet">` in `src/components/header.rs` (order matters: after the vendor files to override them). `style/main.scss` is not linked anywhere and has no effect. Never edit `assets/vendor/` (the one app-owned file there is `assets/vendor/css/control.css`).
 - The public page banner style is `assets/data/banner.css`, rewritten at runtime by the appearance upload (`/*bg-img*/` marker) — keep that marker / the `background-image: url('...')` form intact.
 - Stylesheets and meta tags are declared in `src/components/header.rs`.

CLAUDE.md

@@ -41,7 +41,8 @@ Unit tests are `#[cfg(test)] mod tests` at the bottom of the file they test (`#[
 - `src/pages/` — page and dialog components; `src/components/` — reusable pieces (`DataForm`, `QuestionDialog`, `ModalDialog`, `ServerErr`, `ValidationErr`, `AdminPortal`).
 - `src/locales/` — `trl()` and the translation catalogue.
 - `src/error.rs` — `AppError`; `src/config.rs` — `config.toml` structs (ssr only); `src/validator.rs` — client-side form validation helper.
-- `assets/vendor/` — third-party admin template (Bootstrap based). Don't edit or reformat it; app styles go to `style/main.scss`.
+- `assets/vendor/` — third-party admin template (Bootstrap based). Don't edit or reformat it. App styles are plain CSS files in `assets/css/`, linked in `src/components/header.rs`.
+- `style/main.scss` is compiled to `/pkg/rezervator.css`, but nothing links that file, so styles written there have no effect.
 
 Routes: `/` public booking form, `/login`, `/admin`, `/admin/settings`, `/admin/mail_settings`, `/admin/bookings`, `/admin/customers`, `/admin/appearance`.