Fix UX issues on models page (#7164)

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### Motivation and context
<!-- Why is this change required? What problem does it solve? If it
fixes an open
issue, please link to the issue here. Describe your changes in detail,
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screenshots. -->
- Fixed centering of empty block
- Fixed inconsistency in top bar
- Fixed padding of page numbers


![image](https://github.com/opencv/cvat/assets/50956430/12d1784c-7af0-4989-9ac2-673100d8f31c)

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- [x] I submit my changes into the `develop` branch
- [x] I have created a changelog fragment <!-- see top comment in
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- ~~[] I have updated the documentation accordingly~~
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### License

- [x] I submit _my code changes_ under the same [MIT License](
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project.
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---------

Co-authored-by: Boris Sekachev <boris.sekachev@yandex.ru>

changelog.d/20231122_124701_klakhov_fix_ux_issues_models_page.md

@@ -0,0 +1,4 @@
+### Fixed
+
+- Minor styling issues on empty models page
+  (<https://github.com/opencv/cvat/pull/7164>)

cvat-ui/src/components/models-page/empty-list.tsx

@@ -12,28 +12,29 @@ import config from 'config';
 
 export default function EmptyListComponent(): JSX.Element {
     return (
-        <Empty
-            className='cvat-empty-models-list'
-            description={(
-                <div>
-                    <Row justify='center' align='middle'>
-                        <Col>
-                            <Text strong>No models deployed yet...</Text>
-                        </Col>
-                    </Row>
-                    <Row justify='center' align='middle'>
-                        <Col>
-                            <Text type='secondary'>To annotate your tasks automatically</Text>
-                        </Col>
-                    </Row>
-                    <Row justify='center' align='middle'>
-                        <Col>
-                            <Text type='secondary'>deploy a model with </Text>
-                            <a href={`${config.NUCLIO_GUIDE}`}>nuclio</a>
-                        </Col>
-                    </Row>
-                </div>
-            )}
-        />
+        <div className='cvat-empty-models-list'>
+            <Empty
+                description={(
+                    <div>
+                        <Row justify='center' align='middle'>
+                            <Col>
+                                <Text strong>No models deployed yet...</Text>
+                            </Col>
+                        </Row>
+                        <Row justify='center' align='middle'>
+                            <Col>
+                                <Text type='secondary'>To annotate your tasks automatically</Text>
+                            </Col>
+                        </Row>
+                        <Row justify='center' align='middle'>
+                            <Col>
+                                <Text type='secondary'>deploy a model with </Text>
+                                <a href={`${config.NUCLIO_GUIDE}`}>nuclio</a>
+                            </Col>
+                        </Row>
+                    </div>
+                )}
+            />
+        </div>
     );
 }

cvat-ui/src/components/models-page/styles.scss

@@ -9,20 +9,27 @@
     padding-top: $grid-unit-size * 2;
     padding-bottom: $grid-unit-size;
     overflow: auto;
-    position: fixed;
     height: 100%;
     width: 100%;
 
+    .cvat-models-page-top-bar {
+        padding-bottom: $grid-unit-size;
+    }
+
     >div:nth-child(2) {
-        height: 80%;
+        &:not(.cvat-empty-models-list) {
+            height: 90%;
+        }
     }
 }
 
 .cvat-empty-models-list {
-    position: absolute;
-    top: 50%;
-    left: 50%;
-    transform: translate(-50%, -50%);
+    .ant-empty {
+        position: absolute;
+        top: 50%;
+        left: 50%;
+        transform: translate(-50%, -50%);
+    }
 }
 
 .cvat-models-list {
@@ -68,8 +75,6 @@
 }
 
 .cvat-models-page-top-bar {
-    margin: $grid-unit-size * 3 0;
-
     .cvat-models-page-search-bar {
         width: $grid-unit-size * 32;
         padding-left: $grid-unit-size * 0.5;