Fix Hugging Face Space metadata validation

Adjust the README front matter so the Space passes Hugging Face's metadata pre-receive checks. This is a deployment metadata correction only; the app code is unchanged.

Constraint: Must satisfy Hugging Face Space YAML validation rules
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Keep future README front matter within Hugging Face's allowed enum values and length limits
Tested: Hugging Face pre-receive error messages for `colorTo` and `short_description`
Not-tested: App runtime unchanged; metadata-only fix

README.md

@@ -2,7 +2,7 @@
 title: 'Rhythma'
 emoji: 🎧
 colorFrom: pink
-colorTo: orange
+colorTo: pink
 sdk: gradio
 sdk_version: 6.10.0
 app_file: app.py
@@ -10,7 +10,7 @@ pinned: true
 license: apache-2.0
 thumbnail: >-
   https://cdn-uploads.huggingface.co/production/uploads/64628a722a83863b97beed5e/y4bWysnsPMV2asL_LFB9X.jpeg
-short_description: An artful wellness companion for reflective listening sessions
+short_description: Reflective listening sessions for calm and focus
 ---
 
 Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference