ui-svelte: fix histogram calculation (#695)

- Fix the histogram calculation to use server provided generation
tokens/second.
- Move histogram to Activities page where it can exist with the rest of
the token metrics

Fixes #681

.github/workflows/ui-tests.yml

@@ -19,9 +19,6 @@ jobs:
 
   run-tests:
     runs-on: ubuntu-latest
-    defaults:
-      run:
-        working-directory: ui-svelte
     steps:
     - uses: actions/checkout@v4
 
@@ -32,11 +29,5 @@ jobs:
         cache: 'npm'
         cache-dependency-path: ui-svelte/package-lock.json
 
-    - name: Install dependencies
-      run: npm ci
-
-    - name: Type check
-      run: npm run check
-
-    - name: Run tests
-      run: npm test
+    - name: Run UI tests
+      run: make test-ui