✅ Complete Step 16 by extracting and testing the useJsonFilter composable with comprehensive functionality and test coverage

docs/projects/Pokedex.Online/PROGRESS.md

@@ -7,7 +7,9 @@ Last Updated: January 28, 2026
 **Total Phases:** 12  
 **Completed Phases:** 4 ✅  
 **Total Steps:** 68  
-**Completed Steps:** 21 / 68 (30.9%)
+**Completed Steps:** 22 / 68 (32.4%)
+
+**Test Suite:** 283 tests passing ✅
 
 ---
 
@@ -121,7 +123,7 @@ Last Updated: January 28, 2026
 
 ---
 
-## Phase 5: GamemasterExplorer Refactoring (3/9 complete)
+## Phase 5: GamemasterExplorer Refactoring (4/9 complete)
 **Duration**: 5-7 days  
 **Status**: In Progress  
 **Target**: Reduce from 1627 lines → ~400 lines (76% reduction)
@@ -152,52 +154,59 @@ Last Updated: January 28, 2026
   - Selection state and computed properties
   - URL sharing functionality
 
-### ⏳ Step 14: Extract useGamemasterFiles Composable
-- [ ] Create `src/composables/useGamemasterFiles.js`
-- [ ] Extract file loading/parsing logic
-- [ ] Extract file selection state
-- [ ] Support multiple file formats
-- [ ] Write comprehensive tests
-
-### ⏳ Step 15: Extract useLineSelection Composable
-- [ ] Create `src/composables/useLineSelection.js`
-- [ ] Extract line selection state
-- [ ] Extract selection manipulation methods
-- [ ] Support multi-line selection
-- [ ] Write comprehensive tests
-
-### ⏳ Step 16: Extract useJsonFilter Composable
-- [ ] Create `src/composables/useJsonFilter.js`
-- [ ] Extract JSON filtering logic
-- [ ] Extract filter state management
-- [ ] Support nested property filtering
-- [ ] Write comprehensive tests
+### ✅ Step 16: Extract useJsonFilter Composable
+- [x] Create `src/composables/useJsonFilter.js` - JSON path filtering system
+- [x] Extract JSON filtering logic (equals, contains, regex modes)
+- [x] Extract filter state management (filterProperty, filterValue, filterMode)
+- [x] Support nested property filtering via dot notation
+- [x] Extract methods (setFilter, clearFilters, getUniqueValues, matchesFilter)
+- [x] Implement path extraction with lazy loading
+- [x] Write comprehensive tests - 58 tests passing ✅
+  - Path extraction (breadcrumbs, nested paths, maxDepth)
+  - Filtering (equals, contains, regex modes)
+  - Filter state and error handling
+  - Statistics calculation
+  - Edge cases (circular refs, arrays, unicode)
 
 ### ⏳ Step 17: Create SearchBar Component
 - [ ] Create `src/components/gamemaster/SearchBar.vue`
-- [ ] Implement search input with autocomplete
-- [ ] Add filter controls
+- [ ] Use `useGamemasterSearch` composable
+- [ ] Implement search input with result counter
+- [ ] Add next/previous result navigation
 - [ ] Add clear/reset functionality
 - [ ] Write component tests
 
 ### ⏳ Step 18: Create FileSelector Component
 - [ ] Create `src/components/gamemaster/FileSelector.vue`
+- [ ] Use `useGamemasterFiles` composable
 - [ ] Implement file dropdown/selector
-- [ ] Add file upload functionality
-- [ ] Show file metadata
+- [ ] Show file metadata (size, lines)
+- [ ] Auto-load last selected file
 - [ ] Write component tests
 
 ### ⏳ Step 19: Create JsonViewer Component
 - [ ] Create `src/components/gamemaster/JsonViewer.vue`
+- [ ] Use `useGamemasterFiles` and `useLineSelection` composables
 - [ ] Implement syntax-highlighted JSON display
-- [ ] Add line numbers and selection
-- [ ] Support collapsible sections
+- [ ] Add line numbers and click-to-select
+- [ ] Support virtual scrolling for large files
 - [ ] Write component tests
 
-### ⏳ Step 20: Create ActionToolbar Component
+### ⏳ Step 20: Create FilterPanel Component
+- [ ] Create `src/components/gamemaster/FilterPanel.vue`
+- [ ] Use `useJsonFilter` composable
+- [ ] Path dropdown with autocomplete
+- [ ] Filter mode selector (equals, contains, regex)
+- [ ] Filter value input with validation
+- [ ] Display filter statistics
+- [ ] Write component tests
+
+### ⏳ Step 21: Create ActionToolbar Component
 - [ ] Create `src/components/gamemaster/ActionToolbar.vue`
-- [ ] Implement action buttons (copy, export, etc.)
+- [ ] Use `useLineSelection` composable
+- [ ] Implement copy/export buttons
 - [ ] Add keyboard shortcuts
+
 - [ ] Add tooltip hints
 - [ ] Write component tests