feat(cdlEventHandler): detect TOGGLE Off and emit *_defined globals

Record parameters marked with "TOGGLE Off" by adding an optional
toggleOffParameterNames field and including an extra <var>_defined global
for each such parameter in createCdlEventHandlerSnippet.

To support this, the parser was changed from a brace-delta approach to a
token-based scanner so nesting and the association between a PARAM and its
TOGGLE can be tracked reliably. Added unit tests that verify detection,
case-insensitivity, and ignoring TOGGLE occurrences inside comments/strings
or other events.

test/cdlEventHandler.test.js

@@ -0,0 +1,51 @@
+const assert = require("node:assert/strict")
+const fs = require("node:fs")
+const path = require("node:path")
+const vm = require("node:vm")
+const { test } = require("node:test")
+const { transformSync } = require("esbuild")
+
+const source = fs.readFileSync(path.join(__dirname, "../client/src/common/cdlEventHandler.ts"), "utf8")
+const compiled = transformSync(source, { loader: "ts", format: "cjs" }).code
+const context = { module: { exports: {} } }
+vm.runInNewContext(compiled, context)
+const { cdlEventHandlerAtLine, createCdlEventHandlerSnippet } = context.module.exports
+
+test("TOGGLE Off adds the defined globals to the event handler", () => {
+    const cdl = `EVENT GDM_header
+{
+    PARAM product_status {
+        TYPE o
+        OPTIONS "Serie", "Prototyp"
+    }
+    PARAM stm_param_mpf_name
+    {
+        TYPE s
+        TOGGLE Off
+    }
+    PARAM stm_param_wks_path {
+        TYPE s
+        TOGGLE Off
+    }
+}`
+    const snippet = createCdlEventHandlerSnippet(cdlEventHandlerAtLine(cdl, 0))
+    assert.match(snippet, /global mom_stm_param_mpf_name_defined/)
+    assert.match(snippet, /global mom_stm_param_wks_path_defined/)
+    assert.match(snippet, /global mom_product_status\n/)
+    assert.doesNotMatch(snippet, /mom_product_status_defined/)
+})
+
+test("toggle detection ignores comments, strings, other events, and TOGGLE On", () => {
+    const cdl = `EVENT first {
+        PARAM plain { TYPE s UI_LABEL "TOGGLE Off { ignored }" }
+        PARAM enabled { TOGGLE On }
+        PARAM commented { TYPE s # TOGGLE Off
+        }
+        PARAM mom_disabled { TOGGLE off }
+    }
+    EVENT second { PARAM other { TOGGLE Off } }`
+    const snippet = createCdlEventHandlerSnippet(cdlEventHandlerAtLine(cdl, 0))
+    assert.match(snippet, /global mom_disabled_defined/)
+    assert.equal((snippet.match(/_defined/g) ?? []).length, 1)
+    assert.doesNotMatch(snippet, /mom_mom_|mom_other/)
+})