fix: copy-paste and clone losing request URL and body data

[chirag-bruno]

Summary

• Add renderer:clone-request IPC handler that reads source file from disk for full request data
• Update pasteItem and cloneItem actions to use the new handler

Problem

When copying/cloning a request via the context menu, the pasted request was missing its URL, body, headers, and other data. Only the name and method were preserved.

Root Cause

The copy-paste flow serialized the item from Redux state using transformRequestToSaveToFilesystem(). However, items in Redux can be partially parsed (meta-only for sidebar performance), where request.url is '', request.body is { mode: 'none' }, etc. The serialized clone inherited this incomplete data.

Solution

Added a renderer:clone-request IPC handler that reads the source .bru/.yml file directly from disk (getting the complete request data), updates the name/seq, and writes the clone. Updated both pasteItem and cloneItem actions to use this handler instead of renderer:new-request.

Test plan

• Copy a request via context menu → paste in same folder → verify URL, body, headers are preserved
• Copy a request → paste in different folder → verify full data preserved
• Clone/duplicate a request → verify full data preserved
• Copy a partially-loaded request (one that hasn't been opened yet) → paste → verify URL is present
• TypeScript typecheck passes

JIRA: https://usebruno.atlassian.net/browse/VSCODE-59