feat: Implement Thicc weight tracking CLI with full feature set

[tryonlinux]

A command-line weight tracker with visualization, built with Go, Cobra, Lipgloss, and SQLite.

Features:

• Add, modify, delete, and view weight entries
• Automatic BMI calculation and storage
• Support for both metric (kg/cm) and imperial (lbs/in) units
• ASCII line graph showing weight trend over time
• Goal weight tracking with visual goal line on graph
• Table display with date, weight, and BMI
• First-launch setup wizard for units, height, and goal weight
• SQLite database storage in ~/.thicc/weights.db

Commands:

• add [date] - Add weight entry (defaults to today)
• show [number|date] - Display table and graph (default: last 20)
• modify - Update existing entry
• delete - Remove entry
• goal - Set goal weight
• reset - Wipe all data and settings

Technical Implementation:

• Validation package with proper date/number validation and bounds checking
• BMI calculator supporting all unit combinations
• Graph rendering with Bresenham's line algorithm
• Modular architecture with separate packages for calculator, database, display, models
• Comprehensive test suite (23 tests)
• GitHub Actions for PR testing and releases
• Demo data scripts for testing

🤖 Generated with Claude Code

[github-actions]

✅ Test Results: PASSED

Test Output

=== RUN   TestCalculateBMI_MetricUnits
--- PASS: TestCalculateBMI_MetricUnits (0.00s)
=== RUN   TestCalculateBMI_ImperialUnits
--- PASS: TestCalculateBMI_ImperialUnits (0.00s)
=== RUN   TestCalculateBMI_MixedUnits_KgInches
--- PASS: TestCalculateBMI_MixedUnits_KgInches (0.00s)
=== RUN   TestCalculateBMI_MixedUnits_LbsCm
--- PASS: TestCalculateBMI_MixedUnits_LbsCm (0.00s)
=== RUN   TestCalculateBMI_Underweight
--- PASS: TestCalculateBMI_Underweight (0.00s)
=== RUN   TestCalculateBMI_Overweight
--- PASS: TestCalculateBMI_Overweight (0.00s)
=== RUN   TestFormatWeight
--- PASS: TestFormatWeight (0.00s)
=== RUN   TestFormatBMI
--- PASS: TestFormatBMI (0.00s)
=== RUN   TestFormatDate
--- PASS: TestFormatDate (0.00s)
=== RUN   TestGoalDifferenceCalculation
=== RUN   TestGoalDifferenceCalculation/Need_to_lose_weight
=== RUN   TestGoalDifferenceCalculation/Need_to_gain_weight
=== RUN   TestGoalDifferenceCalculation/At_goal_weight
=== RUN   TestGoalDifferenceCalculation/Small_amount_to_lose
=== RUN   TestGoalDifferenceCalculation/Large_amount_to_gain
--- PASS: TestGoalDifferenceCalculation (0.00s)
    --- PASS: TestGoalDifferenceCalculation/Need_to_lose_weight (0.00s)
    --- PASS: TestGoalDifferenceCalculation/Need_to_gain_weight (0.00s)
    --- PASS: TestGoalDifferenceCalculation/At_goal_weight (0.00s)
    --- PASS: TestGoalDifferenceCalculation/Small_amount_to_lose (0.00s)
    --- PASS: TestGoalDifferenceCalculation/Large_amount_to_gain (0.00s)
=== RUN   TestGoalWeightWithWeightEntries
--- PASS: TestGoalWeightWithWeightEntries (0.04s)
=== RUN   TestGoalWeightEdgeCases
=== RUN   TestGoalWeightEdgeCases/Normal_goal
=== RUN   TestGoalWeightEdgeCases/Zero_goal
=== RUN   TestGoalWeightEdgeCases/Large_goal
=== RUN   TestGoalWeightEdgeCases/Small_goal
=== RUN   TestGoalWeightEdgeCases/Decimal_goal
--- PASS: TestGoalWeightEdgeCases (0.06s)
    --- PASS: TestGoalWeightEdgeCases/Normal_goal (0.01s)
    --- PASS: TestGoalWeightEdgeCases/Zero_goal (0.01s)
    --- PASS: TestGoalWeightEdgeCases/Large_goal (0.01s)
    --- PASS: TestGoalWeightEdgeCases/Small_goal (0.01s)
    --- PASS: TestGoalWeightEdgeCases/Decimal_goal (0.01s)
=== RUN   TestAddAndGetWeights
--- PASS: TestAddAndGetWeights (0.01s)
=== RUN   TestDeleteWeight
--- PASS: TestDeleteWeight (0.01s)
=== RUN   TestModifyWeight
--- PASS: TestModifyWeight (0.01s)
=== RUN   TestGetWeightsBetweenDates
--- PASS: TestGetWeightsBetweenDates (0.01s)
=== RUN   TestGoalWeightSetting
--- PASS: TestGoalWeightSetting (0.01s)
=== RUN   TestUpdateGoalWeight
--- PASS: TestUpdateGoalWeight (0.01s)
=== RUN   TestGoalWeightDifferentUnits
=== RUN   TestGoalWeightDifferentUnits/Imperial
=== RUN   TestGoalWeightDifferentUnits/Metric
=== RUN   TestGoalWeightDifferentUnits/Mixed_LbsCm
=== RUN   TestGoalWeightDifferentUnits/Mixed_KgIn
--- PASS: TestGoalWeightDifferentUnits (0.05s)
    --- PASS: TestGoalWeightDifferentUnits/Imperial (0.01s)
    --- PASS: TestGoalWeightDifferentUnits/Metric (0.01s)
    --- PASS: TestGoalWeightDifferentUnits/Mixed_LbsCm (0.01s)
    --- PASS: TestGoalWeightDifferentUnits/Mixed_KgIn (0.01s)
PASS
ok  	github.com/tryonlinux/thicc/tests	0.216s