Full linting of code not possible on windows

[Steve-Mcl]

Current Behavior

As mentioned in #7774, a full npm run lint fails on windows due to non-cross platform implementation

npm run lint

> @flowfuse/flowfuse@2.32.0 lint
> npm-run-all --sequential lint:eslint lint:colors


> @flowfuse/flowfuse@2.32.0 lint:eslint
> eslint forge frontend test


> @flowfuse/flowfuse@2.32.0 lint:colors
> node scripts/lint-colors.js

:[;]*#[0-9A-Fa-f]{3 was unexpected at this time.
'text-' is not recognized as an internal or external command,
operable program or batch file.
.\packages\flowfuse\scripts\lint-colors.js:57
        throw e
        ^

Error: Command failed: grep -rnE '(:?class)\s*=\s*"[^"]*\b(bg-black|text-(red|yellow|blue|green|indigo|teal|purple|gray|grey)-(50|100|200))\b[^"]*"' --include='*.vue' ".\packages\flowfuse\frontend\src"
'text-' is not recognized as an internal or external command,
operable program or batch file.

    at genericNodeError (node:internal/errors:983:15)
    at wrappedFn (node:internal/errors:537:14)
    at checkExecSyncError (node:child_process:916:11)
    at execSync (node:child_process:988:15)
    at checkTemplateClasses (.\packages\flowfuse\scripts\lint-colors.js:51:15)
    at run (.\packages\flowfuse\scripts\lint-colors.js:109:29)
    at Object.<anonymous> (.\packages\flowfuse\scripts\lint-colors.js:163:1)
    at Module._compile (node:internal/modules/cjs/loader:1706:14)
    at Object..js (node:internal/modules/cjs/loader:1839:10)
    at Module.load (node:internal/modules/cjs/loader:1441:32) {
  status: 255,
  signal: null,
  output: [
    null,
    '',
    "'text-' is not recognized as an internal or external command,\r\n" +
      'operable program or batch file.\r\n'
  ],
  pid: 29064,
  stdout: '',
  stderr: "'text-' is not recognized as an internal or external command,\r\n" +
    'operable program or batch file.\r\n'
}

Node.js v22.22.0
ERROR: "lint:colors" exited with 1.

Expected Behavior

developers should be able to run lint locally

Steps To Reproduce

run lint on windows dev machine

Environment

• FlowFuse version:
• Node.js version:
• npm version:
• Platform/OS: windows 11
• Browser:

Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate