Bug: Files from multiple unrelated project directories are aggregated into single session

## Problem Description
The extension tracks and merges files from completely different workspace folders and root directories into a single session view. Additionally, temporary files (such as VS Code system/extension files) are being logged.

## Steps to Reproduce
1. Open multiple project roots or work with different projects across editor windows.
2. Edit files in different folders (e.g., `raise-your-builder-page`, `website`, `app`).
3. Check the tracked files list in Hackatime.

## Expected Behavior
- Only files belonging to the active/selected project root should be grouped together.
- Temporary editor files (like `toolu_bdrk_..._vscode-.../content.txt`) should be ignored automatically.

## Actual Behavior
Files from distinct directories (`/raise-your-builder-page/`, `/website/`, `/app/`) and internal editor temp files appear mixed together under the same file listing.

## Screenshots

No implementation files or tests are named in the issue. Reproduce the problem with multiple project roots, then trace where tracked file paths are grouped into sessions and where editor temporary files enter tracking. Done means unrelated roots remain separate and temporary VS Code files are excluded.

Written by the indexing model from the issue text.