feat: improve chat UX and add optional auth for public feedback

- Add debounced search (200ms) in chat sidebar for better performance
- Add toast notifications for conversation actions (archive, restore, delete, pin)
- Add race condition protection when loading conversations
- Add OptionalAuthGuard for public feedback endpoint (unauthenticated access)
- Add backHref prop to PageHeader component for back navigation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

services/mana-core-auth/src/feedback/feedback.controller.ts

@@ -11,15 +11,16 @@ import {
 } from '@nestjs/common';
 import { FeedbackService } from './feedback.service';
 import { JwtAuthGuard } from '../common/guards/jwt-auth.guard';
+import { OptionalAuthGuard } from '../common/guards/optional-auth.guard';
 import { CurrentUser, CurrentUserData } from '../common/decorators/current-user.decorator';
 import { CreateFeedbackDto, FeedbackQueryDto } from './dto';
 
 @Controller('feedback')
-@UseGuards(JwtAuthGuard)
 export class FeedbackController {
 	constructor(private readonly feedbackService: FeedbackService) {}
 
 	@Post()
+	@UseGuards(JwtAuthGuard)
 	async createFeedback(
 		@CurrentUser() user: CurrentUserData,
 		@Body() dto: CreateFeedbackDto,
@@ -30,11 +31,16 @@ export class FeedbackController {
 	}
 
 	@Get('public')
-	async getPublicFeedback(@CurrentUser() user: CurrentUserData, @Query() query: FeedbackQueryDto) {
-		return this.feedbackService.getPublicFeedback(user.userId, query);
+	@UseGuards(OptionalAuthGuard)
+	async getPublicFeedback(
+		@CurrentUser() user: CurrentUserData | null,
+		@Query() query: FeedbackQueryDto
+	) {
+		return this.feedbackService.getPublicFeedback(user?.userId || null, query);
 	}
 
 	@Get('my')
+	@UseGuards(JwtAuthGuard)
 	async getMyFeedback(
 		@CurrentUser() user: CurrentUserData,
 		@Query('appId') appId?: string
@@ -43,11 +49,13 @@ export class FeedbackController {
 	}
 
 	@Post(':id/vote')
+	@UseGuards(JwtAuthGuard)
 	async vote(@CurrentUser() user: CurrentUserData, @Param('id') feedbackId: string) {
 		return this.feedbackService.vote(user.userId, feedbackId);
 	}
 
 	@Delete(':id/vote')
+	@UseGuards(JwtAuthGuard)
 	async unvote(@CurrentUser() user: CurrentUserData, @Param('id') feedbackId: string) {
 		return this.feedbackService.unvote(user.userId, feedbackId);
 	}