=== HABIT TRACKER FEATURE PROGRESS ===

Date: 2026-02-10
Branch: feature/habit-tracker
Repo: /home/moltbot/clawd

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COMPLETED STORIES:

[✓] Story 1.0: Define habits.json data schema
    Commit: ee8727a
    Date: 2026-02-10
    
    Implementation:
    - Created dashboard/habits.json with proper schema
    - Root structure: lastUpdated (ISO timestamp) + habits (array)
    - Habit schema: id (string), name (string), frequency (daily/weekly), 
      createdAt (ISO), completions (array of ISO dates)
    - Initial file contains empty habits array with current timestamp
    - All JSON validation passes
    
    Tests:
    - Created dashboard/test_habits_schema.py
    - Tests for file existence, valid JSON, root structure
    - Tests for lastUpdated ISO format validation
    - Tests for habits array type
    - Tests for complete habit schema (all required fields + types)
    - Tests for initial empty state
    - All tests pass ✓
    
    Files modified:
    - dashboard/habits.json (created)
    - dashboard/test_habits_schema.py (created)

[✓] Story 2.0: Backend API - GET /api/habits
    Commit: fc5ebf2
    Date: 2026-02-10
    
    Implementation:
    - Added GET /api/habits endpoint to dashboard/api.py
    - Endpoint returns habits array and lastUpdated timestamp
    - Graceful error handling: returns empty array if file missing/corrupt
    - Follows existing API patterns (similar to /api/git, /api/status)
    - Returns 200 status for all valid requests
    
    Tests:
    - Created dashboard/test_habits_api.py
    - Tests for endpoint existence (returns 200)
    - Tests for valid JSON response
    - Tests for response structure (habits array + lastUpdated)
    - Tests for ISO timestamp validation
    - Tests for empty file handling (returns [], not error)
    - Tests for habits with data
    - All 6 tests pass ✓
    
    Files modified:
    - dashboard/api.py (added handle_habits_get method + route)
    - dashboard/test_habits_api.py (created)

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CODEBASE PATTERNS:

1. JSON Data Files
   - Location: dashboard/*.json
   - Pattern: Similar structure to tasks.json, todos.json, issues.json
   - All use ISO timestamps for dates
   - Root objects contain metadata + data arrays

2. Testing Approach
   - Python test files in dashboard/ directory
   - Test naming: test_*.py
   - Comprehensive validation: existence, JSON validity, schema, types
   - Run tests from repo root with: python3 dashboard/test_*.py

3. Build Validation
   - Command: python3 -m py_compile dashboard/api.py
   - Validates Python syntax without executing

4. Utility Functions in api.py
   - Standalone utility functions placed before TaskBoardHandler class
   - Documented with docstrings (Args, Returns, Rules/behavior)
   - ISO timestamp parsing pattern: datetime.fromisoformat(ts.replace('Z', '+00:00'))
   - Convert to date only when time doesn't matter: dt.date()
   - Use try/except for robust parsing with sensible defaults (return 0, [], etc.)

[✓] Story 3.0: Backend API - POST /api/habits (create habit)
    Commit: 3a09e6c
    Date: 2026-02-10
    
    Implementation:
    - Added POST /api/habits endpoint to dashboard/api.py
    - Accepts {name, frequency} in request body
    - Returns 400 for missing name or empty name (after trim)
    - Returns 400 for invalid frequency (must be 'daily' or 'weekly')
    - Generates unique id following format 'habit-{millisecond_timestamp}'
    - Sets createdAt to current ISO timestamp
    - Initializes completions array as empty
    - Persists new habit to habits.json
    - Updates lastUpdated timestamp in habits.json
    - Returns 201 status with created habit object
    - Graceful handling of missing/corrupt habits.json file
    
    Tests:
    - Created dashboard/test_habits_post.py
    - Tests for successful habit creation (returns 201 + full habit object)
    - Tests for habit persistence to habits.json
    - Tests for correct id format (habit-{timestamp})
    - Tests for missing name validation (400)
    - Tests for empty name validation (400)
    - Tests for invalid frequency validation (400)
    - Tests for missing frequency validation (400)
    - Tests for creating multiple habits (unique IDs)
    - Tests for lastUpdated timestamp update
    - All 9 tests pass ✓
    
    Files modified:
    - dashboard/api.py (added handle_habits_post method + route)
    - dashboard/test_habits_post.py (created)

[✓] Story 4.0: Backend API - Streak calculation utility
    Commit: 3927b7c
    Date: 2026-02-10
    
    Implementation:
    - Created calculate_streak(completions, frequency) utility function
    - Added to dashboard/api.py as standalone function (before TaskBoardHandler class)
    - Accepts completions array (ISO timestamps) and frequency ('daily' or 'weekly')
    - Returns integer streak count (days for daily, weeks for weekly)
    - Daily habits: counts consecutive days without gaps
    - Weekly habits: counts consecutive weeks (7-day periods)
    - Returns 0 for no completions, invalid dates, or broken streaks
    - Edge case: today's completion counts even if streak was 0 yesterday
    - Edge case: multiple completions same day/week count as one period
    - Robust date parsing with error handling for invalid ISO timestamps
    
    Tests:
    - Created dashboard/test_habits_streak.py
    - Tests for no completions (returns 0)
    - Tests for daily single completion (today and yesterday)
    - Tests for daily consecutive days (5 days streak)
    - Tests for daily broken streak (gap detection)
    - Tests for daily old completion (>1 day ago returns 0)
    - Tests for weekly single completion (this week)
    - Tests for weekly consecutive weeks (4 weeks streak)
    - Tests for weekly broken streak (missing week)
    - Tests for weekly old completion (>7 days ago returns 0)
    - Tests for multiple completions same day (deduplicated)
    - Tests for today counting despite yesterday missing
    - Tests for invalid date format handling
    - Tests for weekly multiple in same week (deduplicated)
    - All 14 tests pass ✓
    - All previous tests (schema, GET, POST) still pass ✓
    
    Files modified:
    - dashboard/api.py (added calculate_streak function)
    - dashboard/test_habits_streak.py (created)

[✓] Story 5.0: Backend API - POST /api/habits/{id}/check
    Commit: ca4ee77
    Date: 2026-02-10
    
    Implementation:
    - Added POST /api/habits/{id}/check endpoint to dashboard/api.py
    - Extracts habit ID from URL path (/api/habits/{id}/check)
    - Adds today's date (YYYY-MM-DD) to completions array
    - Returns 400 if habit already checked today
    - Returns 404 if habit ID not found
    - Sorts completions chronologically (oldest first) after adding
    - Uses ISO date format YYYY-MM-DD (not full timestamps)
    - Calculates and returns streak using calculate_streak utility
    - Returns 200 with updated habit object including streak
    - Streak is calculated but not persisted (only in response)
    - Updates lastUpdated timestamp in habits.json
    - Graceful error handling for missing/corrupt files
    
    Tests:
    - Created dashboard/test_habits_check.py
    - Tests for successful habit check (returns 200 + updated habit)
    - Tests for already checked validation (400 error)
    - Tests for habit not found (404 error)
    - Tests for persistence to habits.json
    - Tests for chronological sorting of completions
    - Tests for streak calculation in response
    - Tests for weekly habit checking
    - Tests for ISO date format (YYYY-MM-DD, no time)
    - All 8 tests pass ✓
    - All previous tests (schema, GET, POST, streak) still pass ✓
    
    Files modified:
    - dashboard/api.py (added handle_habits_check method + route in do_POST)
    - dashboard/test_habits_check.py (created)
    - dashboard/habits.json (reset to empty for testing)

[✓] Story 6.0: Backend API - GET /api/habits with streaks
    Commit: c84135d
    Date: 2026-02-10
    
    Implementation:
    - Enhanced GET /api/habits endpoint to include calculated streaks
    - Each habit in response now includes 'streak' field (integer)
    - Each habit in response now includes 'checkedToday' field (boolean)
    - Streak is calculated using the calculate_streak utility function
    - checkedToday checks if today's date (YYYY-MM-DD) is in completions array
    - All original habit fields are preserved in response
    - Get today's date once and reuse for all habits (efficient)
    - Enhanced habits array built by looping through each habit and adding fields
    - Updated docstring to reflect new functionality
    
    Tests:
    - Created dashboard/test_habits_get_enhanced.py
    - Tests for streak field inclusion in response
    - Tests for checkedToday boolean field inclusion
    - Tests for correct streak calculation (daily and weekly habits)
    - Tests for broken streaks (should return 0)
    - Tests for empty habits array handling
    - Tests for preservation of original habit fields
    - All 5 tests pass ✓
    - All previous tests (schema, GET, POST, streak, check) still pass ✓
    
    Files modified:
    - dashboard/api.py (enhanced handle_habits_get method)
    - dashboard/test_habits_get_enhanced.py (created)

[✓] Story 7.0: Frontend - Create habits.html page structure
    Commit: dd0bf24
    Date: 2026-02-10
    
    Implementation:
    - Created dashboard/habits.html with basic layout matching dashboard style
    - Uses common.css and swipe-nav.js for consistent styling and navigation
    - Added navigation bar with 5 items (Dashboard, Workspace, KB, Files, Habits)
    - Habits nav item has 'active' class to indicate current page
    - Page header with title "Habit Tracker" and subtitle
    - Empty state section with lucide 'target' icon
    - Empty state message: "Nicio obișnuință încă. Creează prima!"
    - Add habit button with lucide 'plus' icon and text "Adaugă obișnuință"
    - Theme toggle functionality (dark/light mode) matching dashboard
    - Placeholder JavaScript functions for future API integration
    - HTML5 compliant structure with lang="ro" attribute
    
    Tests:
    - Created dashboard/test_habits_html.py
    - Tests for file existence
    - Tests for valid HTML5 structure (DOCTYPE, required tags, lang attribute)
    - Tests for common.css and swipe-nav.js inclusion
    - Tests for navigation bar with correct items and active state
    - Tests for page title "Habit Tracker" in both <title> and <h1>
    - Tests for empty state message with exact text
    - Tests for add habit button with lucide plus icon
    - All 7 tests pass ✓
    - All previous tests (schema, API endpoints) still pass ✓
    
    Files modified:
    - dashboard/habits.html (created)
    - dashboard/test_habits_html.py (created)
    - dashboard/habits.json (reset to empty for testing)

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CODEBASE PATTERNS UPDATE:

5. Frontend HTML Pages
   - Location: dashboard/*.html
   - Common structure: DOCTYPE html, lang="ro", UTF-8 charset
   - Shared resources: common.css, swipe-nav.js, lucide icons CDN
   - Navigation pattern: header.header > logo + nav.nav > nav-item links
   - Active nav item has 'active' class
   - Theme toggle button in nav with onclick="toggleTheme()"
   - Main content in <main class="main"> with max-width container
   - Page header pattern: .page-header > .page-title + .page-subtitle
   - Empty states: .empty-state with centered icon, message, and action button
   - Icons: use lucide via data-lucide attribute, initialize with lucide.createIcons()

6. Mobile Responsiveness
   - Use @media (max-width: 768px) for mobile breakpoint
   - Touch targets: minimum 44x44px for WCAG compliance (checkboxes, buttons)
   - Modal pattern: full-screen on mobile (100% width/height, no border-radius)
   - Input optimization: autocapitalize="words" for proper names, autocomplete="off" for sensitive fields
   - Navigation: swipe-nav.js provides mobile swipe gestures
   - Viewport: include <meta name="viewport" content="width=device-width, initial-scale=1.0">
   - All buttons should have min-height: 44px on mobile for easy tapping
   - Flexbox direction already handles vertical stacking (flex-direction: column)

[✓] Story 8.0: Frontend - Create habit form modal
    Commit: 97af2ae
    Date: 2026-02-10
    
    Implementation:
    - Added modal HTML structure to habits.html with id='habitModal'
    - Modal overlay uses dashboard styling patterns (overlay + modal container)
    - Form includes text input for habit name (id='habitName', required)
    - Form includes radio button group for frequency selection
    - Two radio options: daily (default, checked) and weekly
    - Custom styled radio buttons using .radio-group and .radio-label classes
    - Radio buttons hidden, labels styled as clickable cards
    - Selected radio shows accent background color
    - Modal actions with Cancel (btn-secondary) and Create (btn-primary) buttons
    - Cancel button calls hideHabitModal()
    - Create button calls createHabit() and starts disabled
    - Modal CSS follows dashboard patterns: modal-overlay, modal, modal-title, form-group, form-label, modal-actions
    - Added toast notification element for user feedback
    - JavaScript: showAddHabitModal() opens modal and resets form
    - JavaScript: hideHabitModal() closes modal by removing 'active' class
    - JavaScript: DOMContentLoaded event listener for form validation
    - Input event listener on name field enables/disables Create button
    - Create button disabled when name is empty (after trim)
    - Enter key submits form if Create button is enabled
    - createHabit() async function posts to /api/habits
    - On success: hides modal, shows toast, calls loadHabits()
    - On error: shows toast with error message
    - showToast() function displays temporary notification (3 seconds)
    - Modal uses CSS variables for theming (--bg-base, --border, --accent, etc.)
    - Responsive design with max-width: 500px and 90% width
    
    Tests:
    - Created dashboard/test_habits_modal.py
    - Tests for modal structure (overlay, container, title)
    - Tests for name input field with required indicator (*)
    - Tests for frequency radio buttons (daily/weekly, daily checked by default)
    - Tests for radio labels with correct Romanian text
    - Tests for Cancel and Create buttons with correct classes and onclick handlers
    - Tests for Create button starting disabled
    - Tests for add habit button calling showAddHabitModal()
    - Tests for modal CSS styling patterns
    - Tests for JavaScript functions (showAddHabitModal, hideHabitModal, createHabit)
    - Tests for form validation logic (disable button, trim validation)
    - Tests for modal show/hide logic (classList.add/remove 'active')
    - Tests for API integration (fetch /api/habits POST)
    - Tests for toast notification element and function
    - Tests for event listeners (DOMContentLoaded, input, keypress)
    - All 9 tests pass ✓
    - All previous tests (schema, API endpoints, HTML structure) still pass ✓
    
    Files modified:
    - dashboard/habits.html (added modal HTML, CSS, and JavaScript)
    - dashboard/test_habits_modal.py (created)

[✓] Story 9.0: Frontend - Display habits list
    Commit: 0483d73
    Date: 2026-02-10
    
    Implementation:
    - Added CSS for habit cards (.habit-card, .habit-icon, .habit-info, .habit-streak)
    - Added CSS for loading state with spinner animation
    - Added CSS for error state with retry button
    - Enhanced HTML with loading, error, and empty states (all with IDs)
    - Implemented loadHabits() async function to fetch from /api/habits
    - Habits sorted by streak descending (highest first)
    - Loading state shown while fetching (loadingState.classList.add('active'))
    - Error state shown on fetch failure with retry button
    - Empty state shown when habits array is empty
    - Habits list shown when habits exist
    - Created createHabitCard(habit) function to render habit cards
    - Daily habits show calendar icon (lucide), weekly show clock icon
    - Each habit displays: name, frequency label, streak with 🔥 emoji
    - Streak displayed as: "{number} 🔥" in accent color
    - XSS protection via escapeHtml() function (uses textContent)
    - Lucide icons reinitialized after rendering (lucide.createIcons())
    - loadHabits() called on DOMContentLoaded (automatic page load)
    - Habits data includes streak and checkedToday from API
    
    Tests:
    - Created dashboard/test_habits_display.py
    - Tests for loading state structure (element, class, icon, message)
    - Tests for error state structure (element, class, icon, message, retry button)
    - Tests for empty state ID attribute
    - Tests for habits list container existence
    - Tests for loadHabits function implementation and API fetch
    - Tests for sorting by streak descending (b.streak - a.streak)
    - Tests for frequency icons (calendar for daily, clock for weekly)
    - Tests for streak display with flame emoji 🔥
    - Tests for state management (show/hide logic)
    - Tests for error handling (catch block)
    - Tests for createHabitCard function existence
    - Tests for page load trigger (DOMContentLoaded listener)
    - Tests for habit card CSS styling
    - Tests for Lucide icons reinitialization after rendering
    - Tests for XSS protection (escapeHtml function)
    - All 15 tests pass ✓
    - All previous tests (schema, API, HTML, modal) still pass ✓
    
    Files modified:
    - dashboard/habits.html (added habit cards CSS, loading/error states HTML, loadHabits implementation)
    - dashboard/test_habits_display.py (created)

[✓] Story 10.0: Frontend - Check habit interaction
    Commit: 775f171
    Date: 2026-02-10
    
    Implementation:
    - Added circular checkbox button to each habit card
    - Checkbox positioned at start of card (before icon)
    - Checkbox styled with border-radius: 50% for circular shape
    - Checkbox shows check icon when checkedToday is true
    - Checkbox has 'checked' and 'disabled' classes when already done today
    - Clicking checkbox calls checkHabit(habitId, element) function
    - checkHabit performs optimistic UI update (checks immediately)
    - API call to POST /api/habits/{id}/check executed after UI update
    - On success: streak element updated with response data, shows toast
    - On error: checkbox reverts to unchecked state, shows error toast
    - Checkbox is non-clickable (disabled) when already checked today
    - Streak updates dynamically using id="streak-{habitId}" element
    - Check icon reinitialized with lucide.createIcons() after adding
    - Hover state for unchecked checkboxes (border-color change)
    - All CSS uses CSS variables for theming consistency
    
    Tests:
    - Created dashboard/test_habits_check_ui.py
    - Tests for checkbox CSS (circular shape, checked/disabled states, hover)
    - Tests for checkbox inclusion in createHabitCard function
    - Tests for checkedToday state reflection in UI
    - Tests for checkHabit function existence and signature
    - Tests for API call to POST /api/habits/{id}/check
    - Tests for optimistic UI update (classList.add before fetch)
    - Tests for error handling and revert logic
    - Tests for disabled state when already checked
    - Tests for streak update from response data
    - Tests for check icon display and lucide reinitialization
    - All 10 tests pass ✓
    - All previous tests (schema, API endpoints, HTML, modal, display) still pass ✓
    
    Files modified:
    - dashboard/habits.html (added checkbox CSS and checkHabit function)
    - dashboard/test_habits_check_ui.py (created)

[✓] Story 11.0: Frontend - Create habit from form
    Commit: 4933847
    Date: 2026-02-10
    
    Implementation:
    - Enhanced createHabit() async function with complete form submission flow
    - Added loading state: button disabled during submission with "Se creează..." text
    - Button disabled immediately on submit (before API call)
    - Original button text stored and restored on error
    - Input field cleared after successful creation (nameInput.value = '')
    - Success flow: closes modal, shows success toast, reloads habits list
    - Error flow: button re-enabled, modal stays open, shows error toast
    - Both API errors (response.ok check) and network errors (catch block) handled
    - Error messages displayed to user via toast notifications
    - Modal stays open on error so user can retry without re-entering data
    - All existing form validation preserved (empty name check, trim validation)
    - Enter key submission still works with loading state integration
    
    Tests:
    - Created dashboard/test_habits_form_submit.py with 9 comprehensive tests
    - Tests for form submission API call (POST /api/habits with name and frequency)
    - Tests for loading state (button disabled, text changed to "Se creează...")
    - Tests for success behavior (modal closes, list refreshes, input cleared)
    - Tests for error behavior (modal stays open, button re-enabled, error shown)
    - Tests for input field clearing after successful creation
    - Tests for preservation of existing form validation logic
    - Tests for modal reset when opened (form cleared)
    - Tests for Enter key submission integration
    - Tests for all 6 acceptance criteria in summary test
    - All 9 tests pass ✓
    - All previous tests (schema, API endpoints, HTML, modal, display, check) still pass ✓
    
    Files modified:
    - dashboard/habits.html (enhanced createHabit function)
    - dashboard/test_habits_form_submit.py (created)
    - dashboard/habits.json (reset to empty for testing)

[✓] Story 12.0: Frontend - Habit card styling
    Commit: c1d4ed1
    Date: 2026-02-10
    
    Implementation:
    - Enhanced habit card styling to match dashboard aesthetic
    - Changed card border-radius from --radius-md to --radius-lg for smoother appearance
    - Changed streak font-size from --text-lg to --text-xl for prominent display
    - Added green background tint (rgba(34, 197, 94, 0.1)) for checked habit cards
    - Added 'checked' CSS class to habit-card when checkedToday is true
    - Implemented pulse animation on checkbox hover for unchecked habits
    - Animation scales checkbox subtly (1.0 to 1.05) with 1.5s ease-in-out timing
    - Styled frequency badge as dashboard tag with inline-block, bg-elevated, border, padding
    - Updated JavaScript createHabitCard to add 'checked' class to card element
    - Updated JavaScript checkHabit to add 'checked' class on successful check
    - Updated error rollback to remove 'checked' class if check fails
    - Added mobile responsiveness with @media (max-width: 768px) query
    - Mobile styles: full width cards, reduced padding, smaller icons (36px, 28px)
    - All CSS uses CSS variables for theming consistency
    
    Tests:
    - Created dashboard/test_habits_card_styling.py with 10 comprehensive tests
    - Tests for file existence
    - Tests for card using --bg-surface with --border (acceptance criteria 1)
    - Tests for --radius-lg border radius on cards (acceptance criteria 6)
    - Tests for streak using --text-xl font size (acceptance criteria 2)
    - Tests for checked habit green background tint (acceptance criteria 3)
    - Tests for pulse animation on unchecked checkbox hover (acceptance criteria 4)
    - Tests for frequency badge dashboard tag styling (acceptance criteria 5)
    - Tests for mobile responsiveness with full width cards (acceptance criteria 7)
    - Tests for checked class in createHabitCard function
    - Summary test verifying all 7 acceptance criteria
    - All 10 tests pass ✓ (acceptance criteria 8)
    - All previous tests (schema, API, HTML, modal, display, check, form) still pass ✓
    
    Files modified:
    - dashboard/habits.html (updated CSS and JavaScript for styling enhancements)
    - dashboard/test_habits_card_styling.py (created)

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NEXT STEPS:
- Continue with remaining 3 stories

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[✓] Story 13.0: Frontend - Add to dashboard navigation
    Commit: 1d56fe3
    Date: 2026-02-10
    
    Implementation:
    - Added Habits link to index.html navigation (5th nav item)
    - Link points to /echo/habits.html with flame icon (lucide)
    - Changed habits.html Habits icon from "target" to "flame" for consistency
    - Navigation structure matches existing pattern (nav-item class)
    - Dashboard link already existed in habits.html (links back properly)
    - Active state styling uses same pattern as other nav items
    - Mobile navigation supported via shared swipe-nav.js
    - All 5 navigation items now present on both pages
    - Flame icon (🔥 lucide) used consistently across both pages
    
    Tests:
    - Created dashboard/test_habits_navigation.py with 9 comprehensive tests
    - Tests for file existence
    - Tests for index.html Habits link to /echo/habits.html (AC1, AC2)
    - Tests for flame icon usage in index.html (AC3)
    - Tests for habits.html link back to dashboard (AC4)
    - Tests for flame icon usage in habits.html (AC3)
    - Tests for active state styling consistency (AC5)
    - Tests for mobile navigation support via swipe-nav.js (AC6)
    - Tests for navigation completeness (all 5 items on both pages)
    - Summary test verifying all 7 acceptance criteria
    - All 9 tests pass ✓ (AC7)
    - All previous tests (schema, API endpoints, HTML, modal, display, check, form, styling) still pass ✓ (except schema test expects empty habits.json)
    
    Files modified:
    - dashboard/index.html (added Habits nav link with flame icon)
    - dashboard/habits.html (changed icon from target to flame)
    - dashboard/test_habits_navigation.py (created)


[✓] Story 14.0: Frontend - Responsive mobile design
    Commit: 0011664
    Date: 2026-02-10
    
    Implementation:
    - Enhanced mobile responsiveness for habit tracker
    - Modal is now full-screen on mobile (< 768px): 100% width/height, no border-radius
    - Touch targets increased to 44x44px for checkboxes (from 28px)
    - All buttons have min-height: 44px on mobile (add-habit-btn, .btn, .radio-label)
    - Form input uses autocapitalize="words" for mobile-optimized keyboard
    - Form input uses autocomplete="off" to prevent autofill issues
    - Habit cards already stack vertically via flex-direction: column
    - Cards are 100% width on mobile for optimal space usage
    - Swipe navigation already enabled via swipe-nav.js inclusion
    - Responsive padding adjustments for .main on mobile
    - Icon sizes adjusted for mobile (habit-icon: 36px, checkbox icons: 20px)
    - All interactive elements meet WCAG touch target guidelines (44x44px minimum)
    
    Tests:
    - Created dashboard/test_habits_mobile.py with 9 comprehensive tests
    - Tests for mobile media query existence (@media max-width: 768px)
    - Tests for modal full-screen on mobile (100% width/height, 100vh, no border-radius) [AC1]
    - Tests for habit cards stacking vertically (flex-direction: column, 100% width) [AC2]
    - Tests for touch targets >= 44x44px (checkbox: 44px, buttons: min-height 44px) [AC3]
    - Tests for mobile-optimized keyboards (autocapitalize="words", autocomplete="off") [AC4]
    - Tests for swipe navigation (swipe-nav.js, viewport meta tag) [AC5]
    - Tests for all button sizing (add-habit-btn, .btn, .radio-label with min-height)
    - Tests for responsive layout structure (.main padding adjustment)
    - Summary test verifying all 6 acceptance criteria [AC6]
    - All 9 tests pass ✓
    - All previous tests (HTML structure, modal, display, check, form, styling, navigation) still pass ✓
    
    Files modified:
    - dashboard/habits.html (enhanced mobile CSS, added input attributes)
    - dashboard/test_habits_mobile.py (created)

[✓] Story 15.0: Backend - Delete habit endpoint
    Commit: 0f9c0de
    Date: 2026-02-10
    
    Implementation:
    - Added do_DELETE method to api.py for handling DELETE requests
    - Route: DELETE /api/habits/{id} deletes habit by ID
    - Extracts habit ID from URL path (/api/habits/{id})
    - Returns 404 if habit not found in habits.json
    - Removes habit from habits array using list.pop(index)
    - Updates lastUpdated timestamp after deletion
    - Returns 200 with success message, including deleted habit ID
    - Graceful error handling for missing/corrupt habits.json (returns 404)
    - Follows existing API patterns (similar to handle_habits_check)
    - Error responses include descriptive error messages
    
    Tests:
    - Created dashboard/test_habits_delete.py with 6 comprehensive tests
    - Tests for habit removal from habits.json file (AC1)
    - Tests for 200 status with success message response (AC2)
    - Tests for 404 when habit not found (AC3)
    - Tests for lastUpdated timestamp update (AC4)
    - Tests for edge cases: deleting already deleted habit, invalid paths
    - Tests for graceful handling when habits.json is missing
    - All 6 tests pass ✓ (AC5)
    - All previous tests (schema, GET, POST, streak, check) still pass ✓
    
    Files modified:
    - dashboard/api.py (added do_DELETE method and handle_habits_delete)
    - dashboard/test_habits_delete.py (created)

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