Prepare README for public release

Author: r11a

PUBLISHING.md

@@ -3,6 +3,7 @@
 ## 1. Prepare the GitHub repository
 
 - Create or use a public GitHub repository named `homeii-music-flow`.
+- Confirm the GitHub repository has a short description and relevant topics such as `home-assistant`, `hacs`, `lovelace`, `music-assistant`, `sendspin`, and `dashboard-card`.
 - Push the full repository contents, including:
   - `README.md`
   - `LICENSE`
@@ -15,6 +16,12 @@
   - `src/sendspin-js/`
   - `vendor/embla-carousel.umd.js`
   - `.github/workflows/validate.yml`
+- Confirm the README renders:
+  - the HOMEii Flow logo
+  - the preview GIF
+  - the screenshot tables
+  - the HACS My Home Assistant button
+  - the HACS download/install button
 
 ## 2. Create the 5.0.0 release
 
@@ -32,9 +39,15 @@
 - Confirm `dist/vendor/embla-carousel.umd.js` exists for mobile swipe support.
 - Confirm `dist/homeii-flow-logo.svg` and `docs/brand/homeii-flow-logo.svg` exist.
 - Confirm the HACS validation workflow is enabled on GitHub.
+- Confirm the README requirements section still matches the current release.
+- Confirm the README Sendspin section explains `ma_url`, `ma_token`, local network preference, and the `This device` flow.
 
 ## 4. Add the repository to HACS as a custom repository
 
+- Quick link:
+
+`https://my.home-assistant.io/redirect/hacs_repository/?owner=r11a&repository=homeii-music-flow&category=plugin`
+
 - Open Home Assistant.
 - Open HACS.
 - Open the menu and choose `Custom repositories`.
@@ -67,3 +80,12 @@ to:
 Then load:
 
 `/local/community/homeii-music-flow/homeii-music-flow.js?v=5.0.0`
+
+## 7. Final pre-release smoke test
+
+- Load the card after a hard browser refresh.
+- Verify main player, compact player, Studio, queue, library, actions, settings, lyrics, announcements, history, recommendations, and night mode screens.
+- Verify `This device` creates a HOMEii Sendspin browser player and does not select an unrelated browser player.
+- Verify phone, tablet, and desktop layouts.
+- Verify light and dark themes.
+- Verify HACS install path and manual install path.