feat: add theme provider and control components for light/dark mode

- Implemented ThemeProvider to manage theme state and preferences.
- Added ThemeControl component for users to switch between system, light, and dark themes.
- Integrated localStorage for theme preference persistence.
- Updated document styles based on theme changes.

test: add tests for permanent deletion of habits and related records

- Created tests to ensure permanent deletion of habits removes all dependent records.
- Verified that deletion requires ownership, authentication, and checks for archived habits.
- Added tests to confirm rollback behavior on deletion failures.

test: add tests for habit palette and progress card functionality

- Implemented tests for habit color progression and theme-based color shading.
- Added tests for progress card calculations and calendar display logic.

feat: define theme types and preferences

- Introduced Theme and ThemePreference types for better type safety.
- Created utility functions for resolving theme based on user preference and system settings.
- Defined theme palettes for light and dark modes to ensure adequate contrast.

PRD.md

@@ -1,11 +1,11 @@
-# Minabot — Habit Tracking PRD
+# Mina Habits — Habit Tracking PRD
 
 Status: Initial product requirements  
 Date: 2026-09-04
 
 ## Application intent
 
-Minabot helps people record daily habit progress and understand their consistency through GitHub-style calendar heatmaps. Users can inspect each habit independently and combine selected habits into shared charts.
+Mina Habits helps people record daily habit progress and understand their consistency through GitHub-style calendar heatmaps. Users can inspect each habit independently and combine selected habits into shared charts.
 
 Individual charts answer, “How much progress did I make on this habit?” Combined charts answer, “How many of the habits due that day did I fully complete?” Partial progress is visible and useful, but does not count as a completed habit in a combined chart.