Cleaning up UI primitives. fixing parser bugs. still struggling to make a command palette lol

src/parser.ts

@@ -168,7 +168,7 @@ export class Parser {
         if (this.current().kind == 'colon-equals') {
             const token = this.current();
             this.advance();
-            const value = this.parseExpression();
+            const value = this.parseExpressionNoMatch();
             return { kind: 'rebind', target: expr, value, ...this.getPos(token) };
         }