Template parser emits invalid TypeScript new ); when optional seed block is empty in generated Column class #10

### Bug description

Generated TypeScript can be invalid in templates emitted by Stackpress.

### Reproduction

1. Generate client/schema code from `templates/blog` (or a similar flow).
2. Inspect generated file:
   - `templates/blog/node_modules/blog-client/Profile/columns/AddressColumn.ts`
3. Formatting/build step fails with:

```txt
SyntaxError: Expression expected. (23:26)
... this._fieldset = new );

Actual behavior

Prettier/parser throws:

SyntaxError: Expression expected. (23:26)
  21 |   public constructor() {
  22 |
> 23 |     this._fieldset = new );
     |                          ^
  24 |     this.shape = this._fieldset.shape.refine(

Expected behavior

Generated constructor call should include a class and optional argument only when present:

• this._fieldset = new AddressSchema(seed);
• this._fieldset = new AddressSchema();

Root cause hypothesis

The template output for constructor creation appears to be generated with a nested optional block, which can produce an empty argument list and emit invalid TS (new );).

Suggested fix

• Prefer passing seed as a direct template value in this path instead of using nested conditional tags inside new (...).
• Or harden the template parser to avoid token parsing where method/name and close patterns consume reserved markers like %, <, and >.

Environment

• Repository: stackpress-lib
• Path: /Users/cnc/Projects/stackpress-lib/stackpress
• Error location: templates/blog/node_modules/blog-client/Profile/columns/AddressColumn.ts line 23

Relevant error snippet

SyntaxError: Expression expected. (23:26)
  23 |     this._fieldset = new );
     |                          ^