fix: reset button for preprocessor scripts now uses preprocessor signature

- Added selectedTab prop to EditorBar component to track active tab
- Modified clearContent function to use preprocessor signature when on preprocessor tab
- Added getPreprocessorCode helper function to return appropriate preprocessor template
- Updated ScriptEditor to pass selectedTab to EditorBar
- Updated WorkspaceScriptPicker and PickHubScript type definitions to support preprocessor kind

Fixes #6594

Co-authored-by: windmill-internal-app[bot] <windmill-internal-app[bot]@users.noreply.github.com>

frontend/src/lib/components/EditorBar.svelte

@@ -44,7 +44,7 @@
 	import type { Schema, SchemaProperty, SupportedLanguage } from '$lib/common'
 	import ScriptVersionHistory from './ScriptVersionHistory.svelte'
 	import type DiffEditor from './DiffEditor.svelte'
-	import { getResetCode } from '$lib/script_helpers'
+	import { getResetCode, TS_PREPROCESSOR_MODULE_CODE, PYTHON_PREPROCESSOR_MODULE_CODE, TS_PREPROCESSOR_SCRIPT_INTRO, PYTHON_PREPROCESSOR_SCRIPT_INTRO } from '$lib/script_helpers'
 	import Popover from './Popover.svelte'
 	import ResourceEditorDrawer from './ResourceEditorDrawer.svelte'
 	import type { EditorBarUi } from './custom_ui'
@@ -66,7 +66,7 @@
 		}
 		iconOnly?: boolean
 		validCode?: boolean
-		kind?: 'script' | 'trigger' | 'approval'
+		kind?: 'script' | 'trigger' | 'approval' | 'preprocessor'
 		template?: 'pgsql' | 'mysql' | 'script' | 'docker' | 'powershell' | 'bunnative'
 		collabMode?: boolean
 		collabLive?: boolean
@@ -83,6 +83,7 @@
 		right?: import('svelte').Snippet
 		openAiChat?: boolean
 		moduleId?: string
+		selectedTab?: 'main' | 'preprocessor'
 	}
 
 	let {
@@ -107,7 +108,8 @@
 		showHistoryDrawer = $bindable(false),
 		right,
 		openAiChat = false,
-		moduleId = undefined
+		moduleId = undefined,
+		selectedTab = 'main'
 	}: Props = $props()
 
 	let contextualVariablePicker: ItemPicker | undefined = $state()
@@ -351,11 +353,34 @@
 
 	function clearContent() {
 		if (editor) {
-			const resetCode = getResetCode(lang, kind as Script['kind'], template)
-			editor.setCode(resetCode)
+			// If we're on the preprocessor tab or the kind is preprocessor, use preprocessor signature
+			if (selectedTab === 'preprocessor' || kind === 'preprocessor') {
+				const preprocessorCode = getPreprocessorCode(lang)
+				if (preprocessorCode) {
+					editor.setCode(preprocessorCode)
+				} else {
+					// Fallback to regular reset code if no preprocessor code is available
+					const resetCode = getResetCode(lang, 'script', template)
+					editor.setCode(resetCode)
+				}
+			} else {
+				const resetCode = getResetCode(lang, kind as Script['kind'], template)
+				editor.setCode(resetCode)
+			}
 		}
 	}
 
+	function getPreprocessorCode(language: SupportedLanguage | 'bunnative' | undefined): string | undefined {
+		if (language === 'deno' || language === 'bun') {
+			return `${TS_PREPROCESSOR_SCRIPT_INTRO}${TS_PREPROCESSOR_MODULE_CODE}`
+		} else if (language === 'python3') {
+			return `${PYTHON_PREPROCESSOR_SCRIPT_INTRO}${PYTHON_PREPROCESSOR_MODULE_CODE}`
+		} else if (language === 'nativets' || language === 'bunnative') {
+			return `${TS_PREPROCESSOR_SCRIPT_INTRO}${TS_PREPROCESSOR_MODULE_CODE}`
+		}
+		return undefined
+	}
+
 	function windmillPathToCamelCaseName(path: string): string {
 		const parts = path.split('/')
 		const lastPart = parts[parts.length - 1]

frontend/src/lib/components/ScriptEditor.svelte

@@ -510,6 +510,7 @@
 					: undefined}
 				{diffMode}
 				bind:showHistoryDrawer
+				{selectedTab}
 			>
 				{#snippet right()}
 					{@render editor_bar_right?.()}

frontend/src/lib/components/flows/pickers/PickHubScript.svelte

@@ -9,7 +9,7 @@
 	import { Loader2 } from 'lucide-svelte'
 
 	interface Props {
-		kind?: HubScriptKind & string
+		kind?: (HubScriptKind | 'preprocessor') & string
 		filter?: string
 		syncQuery?: boolean
 		children?: import('svelte').Snippet

frontend/src/lib/components/flows/pickers/WorkspaceScriptPicker.svelte

@@ -10,7 +10,7 @@
 	import Toggle from '$lib/components/Toggle.svelte'
 	import NoItemFound from '$lib/components/home/NoItemFound.svelte'
 
-	export let kind: 'script' | 'trigger' | 'approval' | 'failure' = 'script'
+	export let kind: 'script' | 'trigger' | 'approval' | 'failure' | 'preprocessor' = 'script'
 	export let isTemplate: boolean | undefined = undefined
 	export let displayLock = false