refactor: consolidate dual Tailwind config into single TypeScript config (#1090)

* Initial plan

* Remove redundant tailwind.config.js and update documentation references

- Delete tailwind.config.js (CommonJS with hardcoded values)
- Keep tailwind.config.ts as single source of truth using design tokens
- Update docs/DESIGN_SYSTEM.md references to tailwind.config.ts
- Update docs/COMPLIANCE_EVIDENCE.md reference to tailwind.config.ts
- All values in .js were already present in .ts via design tokens
- Build, lint, and all 2467 tests pass

Agent-Logs-Url: https://github.com/Hack23/cia-compliance-manager/sessions/dec37b59-86b7-4c63-836d-00fdde58af6d

Co-authored-by: pethers <1726836+pethers@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: pethers <1726836+pethers@users.noreply.github.com>

Author: Copilot

docs/COMPLIANCE_EVIDENCE.md

@@ -227,7 +227,7 @@ curl -s https://api.securityscorecards.dev/projects/github.com/Hack23/cia-compli
 | 📊 **Evidence Type** | 🎯 **Implementation** | ✅ **Current Status** | 🔗 **Evidence Location** |
 |---------------------|---------------------|---------------------|------------------------|
 | **Design Tokens** | Centralized token system | ✅ Implemented | [Design Tokens](https://github.com/Hack23/cia-compliance-manager/blob/main/src/constants/designTokens.ts) |
-| **TailwindCSS Integration** | Extended theme configuration | ✅ Implemented | [tailwind.config.js](https://github.com/Hack23/cia-compliance-manager/blob/main/tailwind.config.js) |
+| **TailwindCSS Integration** | Extended theme configuration | ✅ Implemented | [tailwind.config.ts](https://github.com/Hack23/cia-compliance-manager/blob/main/tailwind.config.ts) |
 | **Consistent Spacing** | 8px grid system | ✅ Applied | [Design System](./DESIGN_SYSTEM.md) |
 | **Typography Scale** | Semantic font sizes | ✅ Implemented | [Design Tokens](https://github.com/Hack23/cia-compliance-manager/blob/main/src/constants/designTokens.ts) |
 | **Color Palette** | Semantic color system | ✅ Defined | [Design Tokens](https://github.com/Hack23/cia-compliance-manager/blob/main/src/constants/designTokens.ts) |

docs/DESIGN_SYSTEM.md

@@ -26,7 +26,7 @@ Design System
 │   ├── Colors
 │   ├── Shadows
 │   └── Transitions
-├── TailwindCSS Configuration (tailwind.config.js)
+├── TailwindCSS Configuration (tailwind.config.ts)
 │   └── Extended theme with design tokens
 ├── CSS Variables (src/styles/variables.css)
 │   └── Runtime theming support
@@ -545,7 +545,7 @@ import { WIDGET_DESIGN } from '@/constants/designTokens';
 
 ### Files
 - **Design Tokens**: `src/constants/designTokens.ts`
-- **TailwindCSS Config**: `tailwind.config.js`
+- **TailwindCSS Config**: `tailwind.config.ts`
 - **CSS Variables**: `src/styles/variables.css`
 - **Widget Container**: `src/components/common/WidgetContainer.tsx`