docs: comprehensive documentation updates and modernization

- Update BUILDING.md with current build system information
- Modernize various README files across the project
- Update CHANGELOG.md with recent changes
- Improve documentation consistency and formatting
- Update platform-specific documentation (iOS, Electron, Docker)
- Enhance test documentation and build guides

doc/DEEP_LINKS.md

@@ -47,6 +47,7 @@ type ClaimParams = z.infer<typeof claimSchema>;
 ### Type Safety Layers
 
 1. **Schema Definition**
+
    ```typescript
    // src/interfaces/deepLinks.ts
    export const deepLinkSchemas = {
@@ -59,6 +60,7 @@ type ClaimParams = z.infer<typeof claimSchema>;
    ```
 
 2. **Type Generation**
+
    ```typescript
    // Types are automatically generated from schemas
    export type DeepLinkParams = {
@@ -67,6 +69,7 @@ type ClaimParams = z.infer<typeof claimSchema>;
    ```
 
 3. **Runtime Validation**
+
    ```typescript
    // In DeepLinkHandler
    const result = deepLinkSchemas.claim.safeParse(params);