feat: add bulk triage view component and related stories

- Exported BulkTriageViewComponent and its related types from findings module.
- Created a new accessibility test suite for score components using axe-core.
- Introduced design tokens for score components to standardize styling.
- Enhanced score breakdown popover for mobile responsiveness with drag handle.
- Added date range selector functionality to score history chart component.
- Implemented unit tests for date range selector in score history chart.
- Created Storybook stories for bulk triage view and score history chart with date range selector.

docs/ui/components/README.md

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+# UI Components
+
+This directory contains documentation for the StellaOps Angular UI components.
+
+## Evidence-Weighted Score (EWS) Components
+
+The EWS component suite provides visual representations of vulnerability scores based on evidence-weighted analysis.
+
+### Core Components
+
+| Component | Purpose | Location |
+|-----------|---------|----------|
+| [ScorePill](./score-pill.md) | Compact score display with bucket coloring | `shared/components/score/` |
+| [ScoreBreakdownPopover](./score-breakdown-popover.md) | Detailed score breakdown with dimensions | `shared/components/score/` |
+| [ScoreBadge](./score-badge.md) | Evidence flag badges (live-signal, proven-path, etc.) | `shared/components/score/` |
+| [ScoreHistoryChart](./score-history-chart.md) | Timeline visualization of score changes | `shared/components/score/` |
+
+### Feature Components
+
+| Component | Purpose | Location |
+|-----------|---------|----------|
+| [FindingsList](./findings-list.md) | Findings table with EWS integration | `features/findings/` |
+| [BulkTriageView](./bulk-triage-view.md) | Bulk triage interface with bucket summaries | `features/findings/` |
+
+## Score Buckets
+
+All EWS components use a consistent bucket system:
+
+| Bucket | Score Range | Color | Priority |
+|--------|-------------|-------|----------|
+| Act Now | 90-100 | Red (`#DC2626`) | Critical - Immediate action required |
+| Schedule Next | 70-89 | Amber (`#D97706`) | High - Schedule for next sprint |
+| Investigate | 40-69 | Blue (`#2563EB`) | Medium - Investigate when possible |
+| Watchlist | 0-39 | Gray (`#6B7280`) | Low - Monitor for changes |
+
+## Evidence Flags
+
+Findings can have special flags indicating evidence quality:
+
+| Flag | Icon | Color | Description |
+|------|------|-------|-------------|
+| `live-signal` | Signal wave | Green | Active runtime signals detected |
+| `proven-path` | Checkmark | Blue | Verified reachability path confirmed |
+| `vendor-na` | Strikethrough | Gray | Vendor marked as not affected |
+| `speculative` | Question mark | Orange | Evidence is speculative/unconfirmed |
+
+## Quick Start
+
+### Import Components
+
+```typescript
+// Score components
+import {
+  ScorePillComponent,
+  ScoreBreakdownPopoverComponent,
+  ScoreBadgeComponent,
+  ScoreHistoryChartComponent,
+} from '@app/shared/components/score';
+
+// Findings components
+import {
+  FindingsListComponent,
+  BulkTriageViewComponent,
+} from '@app/features/findings';
+```
+
+### Basic Usage
+
+```html
+<!-- Display a score pill -->
+<stella-score-pill [score]="78" size="md" />
+
+<!-- Display score badges -->
+<stella-score-badge type="live-signal" />
+<stella-score-badge type="proven-path" />
+
+<!-- Full findings list with scoring -->
+<app-findings-list
+  [findings]="findings"
+  [autoLoadScores]="true"
+  (findingSelect)="onFindingSelect($event)"
+/>
+```
+
+## Storybook
+
+Interactive examples and documentation are available in Storybook:
+
+```bash
+cd src/Web/StellaOps.Web
+npm run storybook
+```
+
+Navigate to:
+- `Score/ScorePill` - Score pill variants
+- `Score/ScoreBreakdownPopover` - Breakdown popover examples
+- `Score/ScoreBadge` - Evidence flag badges
+- `Score/ScoreHistoryChart` - History chart variants
+- `Findings/FindingsList` - Findings list with scoring
+- `Findings/BulkTriageView` - Bulk triage interface
+
+## Design Tokens
+
+Score colors are defined as CSS custom properties. See [design-tokens.md](./design-tokens.md) for the full token reference.
+
+## Accessibility
+
+All components follow WCAG 2.1 AA guidelines:
+- Proper ARIA labels and roles
+- Keyboard navigation support
+- Focus management
+- Color contrast ratios meet AA standards
+- Screen reader announcements for dynamic content