feat: Replace figlet with @clack/prompts for polished CLI experience

Replaces ASCII art banner and basic readline prompts with @clack/prompts for a modern interactive CLI. Adds animated shimmer progress bars with spinner glyphs during indexing operations. Improves installer UX with structured prompts, better error handling, and cleaner output formatting throughout all CLI commands.

package.json

@@ -34,9 +34,9 @@
   "author": "",
   "license": "MIT",
   "dependencies": {
+    "@clack/prompts": "^1.2.0",
     "@xenova/transformers": "^2.17.0",
     "commander": "^14.0.2",
-    "figlet": "^1.8.0",
     "node-sqlite3-wasm": "^0.8.30",
     "picomatch": "^4.0.3",
     "tree-sitter-wasms": "^0.1.11",
@@ -44,7 +44,6 @@
   },
   "devDependencies": {
     "@types/better-sqlite3": "^7.6.0",
-    "@types/figlet": "^1.5.8",
     "@types/node": "^20.19.30",
     "@types/picomatch": "^4.0.2",
     "typescript": "^5.0.0",