docs(09-02): complete unit and component tests plan

Tasks completed: 3/3
- Write unit tests for highlightText and parseHashtags utilities
- Write browser-mode component tests for 3 Svelte 5 components
- Configure coverage thresholds with baseline

SUMMARY: .planning/phases/09-ci-pipeline/09-02-SUMMARY.md

.planning/phases/09-ci-pipeline/09-02-SUMMARY.md

@@ -0,0 +1,124 @@
+---
+phase: 09-ci-pipeline
+plan: 02
+subsystem: testing
+tags: [vitest, svelte5, browser-testing, coverage, unit-tests]
+
+# Dependency graph
+requires:
+  - phase: 09-01
+    provides: Multi-project Vitest configuration, SvelteKit module mocks
+provides:
+  - Comprehensive utility function tests (100% coverage for utils)
+  - Browser-mode component testing pattern for Svelte 5
+  - Coverage thresholds preventing regression
+affects: [09-03, 09-04]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns: [vitest-browser-mode-testing, svelte5-component-tests, coverage-threshold-enforcement]
+
+key-files:
+  created:
+    - src/lib/utils/highlightText.test.ts
+    - src/lib/utils/parseHashtags.test.ts
+    - src/lib/components/CompletedToggle.svelte.test.ts
+    - src/lib/components/SearchBar.svelte.test.ts
+    - src/lib/components/TagInput.svelte.test.ts
+  modified:
+    - vite.config.ts
+    - vitest-setup-client.ts
+
+key-decisions:
+  - "Coverage thresholds set at statements 10%, branches 5%, functions 20%, lines 8%"
+  - "Target is 80% coverage, thresholds will increase incrementally"
+  - "Component tests use vitest/browser import (not deprecated @vitest/browser/context)"
+  - "SvelteKit mocks centralized in vitest-setup-client.ts"
+
+patterns-established:
+  - "Import page from 'vitest/browser' for browser-mode tests"
+  - "Use render from vitest-browser-svelte for Svelte 5 components"
+  - "page.getByRole(), page.getByText(), page.getByPlaceholder() for element selection"
+  - "await expect.element(locator).toBeInTheDocument() for assertions"
+
+# Metrics
+duration: 4min
+completed: 2026-02-03
+---
+
+# Phase 9 Plan 2: Unit & Component Tests Summary
+
+**Comprehensive utility function tests and browser-mode component tests establishing testing patterns for the codebase**
+
+## Performance
+
+- **Duration:** 4 min
+- **Started:** 2026-02-03T23:32:00Z
+- **Completed:** 2026-02-03T23:37:00Z
+- **Tasks:** 3
+- **Files modified:** 6
+
+## Accomplishments
+
+- All 3 utility functions (filterEntries, highlightText, parseHashtags) have 100% test coverage
+- 3 Svelte 5 components tested with browser-mode pattern (SearchBar, TagInput, CompletedToggle)
+- 94 total tests passing (76 server/node mode, 18 client/browser mode)
+- Coverage thresholds configured to prevent regression
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Write unit tests for utility functions** - `20d9ebf` (test)
+2. **Task 2: Write browser-mode component tests** - `43446b8` (test)
+3. **Task 3: Configure coverage thresholds** - `d647308` (chore)
+
+## Files Created/Modified
+
+- `src/lib/utils/highlightText.test.ts` - 24 tests for text highlighting
+- `src/lib/utils/parseHashtags.test.ts` - 35 tests for hashtag parsing
+- `src/lib/components/CompletedToggle.svelte.test.ts` - 5 tests for toggle component
+- `src/lib/components/SearchBar.svelte.test.ts` - 7 tests for search input
+- `src/lib/components/TagInput.svelte.test.ts` - 6 tests for tag selector
+- `vitest-setup-client.ts` - Added mocks for $app/state, preferences, recentSearches
+- `vite.config.ts` - Configured coverage thresholds
+
+## Test Coverage
+
+| Category | Statements | Branches | Functions | Lines |
+|----------|------------|----------|-----------|-------|
+| Overall  | 11.9%      | 6.62%    | 23.72%    | 9.74% |
+| Utils    | 100%       | 100%     | 100%      | 100%  |
+| Threshold| 10%        | 5%       | 20%       | 8%    |
+
+## Decisions Made
+
+- **Coverage thresholds below current levels** - Set to prevent regression while allowing incremental improvement toward 80% target
+- **Centralized mocks in setup file** - Avoids vi.mock hoisting issues in individual test files
+- **vitest/browser import** - Updated from deprecated @vitest/browser/context
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+
+- **vi.mock hoisting** - Factory functions cannot use external variables; mocks moved to setup file
+- **page.locator not available** - Used render() return value or page.getByRole/getByText instead
+- **Deprecated import warning** - Fixed by using 'vitest/browser' instead of '@vitest/browser/context'
+
+## User Setup Required
+
+None - test infrastructure is fully configured.
+
+## Next Phase Readiness
+
+- Test infrastructure proven with both browser and node modes
+- Component testing pattern documented for future test authors
+- Coverage thresholds active to prevent regression
+- Ready for E2E tests (09-03) and CI pipeline integration (09-04)
+
+---
+*Phase: 09-ci-pipeline*
+*Completed: 2026-02-03*