Add Pomodoro focus mode with session summaries
Model: FocusSession; API: /api/focus-sessions/; UI: Focus modal on timer page
Add estimates vs actuals with burndown and budget alerts
Project fields: estimated_hours, budget_amount, budget_threshold_percent
API: /api/projects/<id>/burndown; Charts in project view and project report
Implement recurring time blocks/templates
Model: RecurringBlock; API CRUD: /api/recurring-blocks; CLI: flask generate_recurring
Add tagging and saved filters across views
Model: SavedFilter; /api/entries supports tag and saved_filter_id
Support billable rate overrides per project/member
Model: RateOverride; invoicing uses effective rate resolution
Also:
Migration: 016_add_focus_recurring_rates_filters_and_project_budget.py
Integrations and UI updates in projects view, timer page, and reports
Docs updated (startup, invoice, task mgmt) and README feature list
Added basic tests for new features
