feat(icons): implement shared SVG icon system across packages

- Create centralized SVG files in core icons package assets directory
- Add rollup-plugin-string to core icons for SVG file processing
- Export SVG_ICONS object from core package for cross-package sharing
- Refactor html-icons to import SVG strings from @vjs-10/icons
- Remove hardcoded SVG strings in favor of shared definitions
- Add TypeScript declarations for SVG imports

This establishes a foundation for sharing more code across the monorepo
while maintaining proper package boundaries and build system integration.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

package-lock.json

@@ -4497,6 +4497,16 @@
         "node": ">= 6"
       }
     },
+    "node_modules/rollup-plugin-string": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/rollup-plugin-string/-/rollup-plugin-string-3.0.0.tgz",
+      "integrity": "sha512-vqyzgn9QefAgeKi+Y4A7jETeIAU1zQmS6VotH6bzm/zmUQEnYkpIGRaOBPY41oiWYV4JyBoGAaBjYMYuv+6wVw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "rollup-pluginutils": "^2.4.1"
+      }
+    },
     "node_modules/rollup-pluginutils": {
       "version": "2.8.2",
       "resolved": "https://registry.npmjs.org/rollup-pluginutils/-/rollup-pluginutils-2.8.2.tgz",
@@ -5805,6 +5815,7 @@
         "@rollup/plugin-node-resolve": "^15.0.0",
         "@rollup/plugin-typescript": "^11.0.0",
         "rollup": "^4.0.0",
+        "rollup-plugin-string": "^3.0.0",
         "tslib": "^2.6.0",
         "typescript": "^5.3.0"
       }