✨ (theme) Add progress bar option (#1276)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **New Features**
- Introduced progress bar functionality across various components for a
more interactive user experience.
	- Added progress tracking and display in chat sessions.
- **Enhancements**
- Adjusted layout height calculations in the settings and theme pages
for consistency.
- Improved theme customization options with progress bar styling and
placement settings.
- **Bug Fixes**
- Fixed dynamic height calculation issues in settings and theme side
menus by standardizing heights.
- **Style**
- Added custom styling properties for the progress bar in chat
interfaces.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/schemas/features/chat/sessionState.ts

@@ -81,6 +81,11 @@ const sessionStateSchemaV2 = z.object({
     .describe('Expiry timeout in milliseconds'),
   typingEmulation: settingsSchema.shape.typingEmulation.optional(),
   currentVisitedEdgeIndex: z.number().optional(),
+  progressMetadata: z
+    .object({
+      totalAnswers: z.number(),
+    })
+    .optional(),
 })
 
 const sessionStateSchemaV3 = sessionStateSchemaV2