feat: add project icon picker component and integrate with project management

- Implemented ProjectIconPicker component for selecting project icons.
- Created ProjectIcon component to display selected icons.
- Updated calendar page to remove unused PageHeading component.
- Modified growth page to enhance UI and improve text clarity.
- Refactored index page to include project icons and improve layout.
- Added mine page for user profile management with avatar selection.
- Introduced projects-sort page for managing project order with drag-and-drop functionality.
- Enhanced projects page to allow icon selection when adding or editing projects.
- Updated record page to streamline user experience and improve form actions.
- Adjusted practice service to support project icon management.
- Added tests for project saving functionality to ensure correct handling of icons.
- Updated global type definitions to support SVG and PNG imports.

docs/design/project-icons/barre.svg

@@ -0,0 +1,11 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="128" height="128" viewBox="0 0 128 128" fill="none" role="img" aria-labelledby="title desc">
+  <title id="title">把杆 · Barre</title>
+  <desc id="desc">灰玫瑰线描双层练习把杆，柔和木色横杆与稳定的立柱底座。</desc>
+  <g stroke="#9c5268" stroke-width="2.2" stroke-linecap="round" stroke-linejoin="round">
+    <path d="M25 31H31V107H25ZM97 31H103V107H97Z" fill="#fff4ed"/>
+    <rect x="12" y="30" width="104" height="8" rx="4" fill="#ead1d7"/>
+    <rect x="12" y="58" width="104" height="8" rx="4" fill="#f3e4e5"/>
+    <path d="M17 110L24 104H32L39 110V113H17ZM89 110L96 104H104L111 110V113H89Z" fill="#ead1d7"/>
+    <path d="M19 34H28M19 62H28M44 113H84" stroke="#bd8292" stroke-width="1.4"/>
+  </g>
+</svg>