Timesheet MCP Server

## Description Brief description of what this PR does. ## Type of Change - [ ] Bug fix (non-breaking change which fixes an issue) - [ ] New feature (non-breaking change which adds functionality) - [ ] Breaking change (fix or feature that would cause existing functionality to change) - [ ] Documentation update ## Related Issue Fixes #(issue number) ## Testing Done - [ ] Tested with MCP Inspector - [ ] Tested with Claude Desktop (if applicable) - [ ] Added/updated tests - [ ] All existing tests pass ## Checklist - [ ] Code follows project style guidelines - [ ] Self-review completed - [ ] Comments added for complex code - [ ] Documentation updated - [ ] No new warnings generated - [ ] CHANGELOG.md updated (if applicable) ## Screenshots (if applicable)