feat(brand): rebrand to Hedena Gold and bring main user-app chrome

Rename the brand, ship Hedena logos, persist login OTP text in the SMS list, and port home/nav/auth/theme polish from main while keeping expert customers intact.

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

docs/superpowers/specs/2026-10-15-brand-logo-assets-design.md

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+# Brand logo assets — icon-only mark
+
+Date: 2026-10-15
+
+## Goal
+
+Replace all brand image assets with the new Hedena icon-only mark (gold symbol on black, no wordmark). Keep text brand name as هدنا گلد / Hedena Gold in `brand.ts`.
+
+## Source
+
+- Master: icon-only logo (Frame 2) — square, gold on black, no text.
+- Full wordmark (Frame 1) is not used in this pass.
+
+## Mapping
+
+| Role | Targets |
+|---|---|
+| App / admin logos | `user-app` `brand-logo.png/.webp` (public + assets); admin `brand-icon.png/.webp`, `brand-horizontal.png` |
+| Favicon + PWA | `favicon.ico` / `favicon.png`, `icon-192.png`, `icon-512.png` in both apps’ `public/` |
+| Product no-image | `user-app` `public/img/no-items.png` and `src/assets/img/no-items.png` |
+| Lazy-load error placeholder | Continues to use `brand-logo.png` via `main.ts` (no code path change) |
+
+## Out of scope
+
+- Renaming brand strings in `brand.ts` or SMS env
+- Empty-state SVG illustrations (cart empty, etc.)
+- Regenerating `dist/` / API release builds (caller rebuilds as needed)
+
+## Approach
+
+Overwrite fixed filenames listed in `docs/BRANDING.md`. Resize the same master for PWA/favicon sizes. No Vue template changes required if paths stay the same.