feat(export-import): add yaml export/import with id upsert for credentials, snippets, and scenarios

- all entities export a kind field (credential/snippet/scenario) for safe type checking on import
- import upserts by id: overwrites if id exists, creates with explicit id otherwise
- scenario export now includes id and step ids; import deletes old steps before recreating
- add GET /:id/export and POST /import endpoints to credential and snippet controllers
- add UuidBadge ui component: shortens uuid to first+last 4 hex chars, tooltip, clipboard copy with animated ClipboardCheck icon pop
- apply UuidBadge across all entity id display sites (detail pages, card footers, table columns)
- add export/import buttons to CredentialsPage, SnippetsPage, CredentialDetailPage, SnippetDetailPage

server/src/session/session.controller.ts

@@ -5,7 +5,7 @@ import {
   HttpCode,
   NotFoundException,
   Param,
-  ParseIntPipe,
+  ParseUUIDPipe,
   Query,
 } from "@nestjs/common";
 import { ApiOperation, ApiResponse, ApiTags } from "@nestjs/swagger";
@@ -38,7 +38,7 @@ export class SessionController {
   @ApiOperation({ summary: "Get a session by ID" })
   @ApiResponse({ status: 200, description: "Session found" })
   @ApiResponse({ status: 404, description: "Session not found" })
-  async findOne(@Param("id", ParseIntPipe) id: number) {
+  async findOne(@Param("id", ParseUUIDPipe) id: string) {
     const session = await this.sessionService.findById(id);
     if (!session) throw new NotFoundException(`Session ${id} not found`);
     const {
@@ -58,7 +58,7 @@ export class SessionController {
   @ApiOperation({ summary: "Delete a session by ID (closes it first if open)" })
   @ApiResponse({ status: 204, description: "Session deleted" })
   @ApiResponse({ status: 404, description: "Session not found" })
-  async remove(@Param("id", ParseIntPipe) id: number): Promise<void> {
+  async remove(@Param("id", ParseUUIDPipe) id: string): Promise<void> {
     await this.sessionContextService.delete(id);
   }
 }