Fix typst export 500, add export-as-latex for typst projects

- clsi-nginx: allow hyphens in project-id regex — conversion IDs are UUIDs
  which nginx was rejecting, causing 500 on file download after conversion
- CLSI ConversionController/Manager: add 'latex' export type (typst→latex via pandoc)
- Web: add 'latex' to SUPPORTED_CONVERSION_TYPES
- Frontend: add Export as LaTeX button (visible only for typst projects)
- Fix visibility logic: export-as-latex shows for typst, export-as-typst shows for latex
- Add export_as_latex translation key (en + fr)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

services/clsi/app/js/ConversionController.js

@@ -26,6 +26,7 @@ const CONVERSION_CONFIGS = {
   markdown: { extension: 'zip' },
   html: { extension: 'zip' },
   typst: { extension: 'typ' },
+  latex: { extension: 'tex' },
 }
 
 async function convertDocumentToLaTeX(req, res) {

services/clsi/app/js/ConversionManager.js

@@ -191,6 +191,19 @@ const LATEX_EXPORT_CONFIGS = {
       'typst',
     ],
   },
+  latex: {
+    fileExtension: 'tex',
+    compressOutput: false,
+    getPandocArgs: ({ outputPath }) => [
+      '--output',
+      outputPath,
+      '--from',
+      'typst',
+      '--to',
+      'latex',
+      '--standalone',
+    ],
+  },
 }
 
 async function convertLaTeXToDocumentInDirWithLock(

services/web/app/src/Features/Downloads/ProjectDownloadsController.mjs

@@ -21,6 +21,7 @@ const SUPPORTED_CONVERSION_TYPES = new Map([
   ['markdown', 'zip'],
   ['html', 'zip'],
   ['typst', 'typ'],
+  ['latex', 'tex'],
 ])
 
 const exportProjectConversionSchema = z.object({
@@ -100,14 +101,14 @@ async function exportProjectConversion(req, res) {
         { compileFromHistory, rootResourcePath }
       )
     AnalyticsManager.recordEventForUserInBackground(userId, 'convert-format', {
-      sourceFormat: 'latex',
+      sourceFormat: type === 'latex' ? 'typst' : 'latex',
       targetFormat: type,
       status: 'success',
       operation: 'export',
     })
   } catch (error) {
     AnalyticsManager.recordEventForUserInBackground(userId, 'convert-format', {
-      sourceFormat: 'latex',
+      sourceFormat: type === 'latex' ? 'typst' : 'latex',
       targetFormat: type,
       status: 'failure',
       operation: 'export',

services/web/frontend/js/features/ide-react/components/toolbar/export-project-with-conversion-button.tsx

@@ -10,7 +10,7 @@ import { useProjectSettingsContext } from '@/features/editor-left-menu/context/p
 
 type ExportProjectWithConversionProps = {
   featureFlag?: string
-  conversionType: 'docx' | 'markdown' | 'html' | 'typst'
+  conversionType: 'docx' | 'markdown' | 'html' | 'typst' | 'latex'
   label: string
   menuBarId: string
 }
@@ -25,6 +25,9 @@ export const ExportProjectWithConversionButton: FC<
   const anonymous = getMeta('ol-anonymous')
   const { compiler } = useProjectSettingsContext()
   const isLatexProject = !['typst', 'quarto'].includes(compiler ?? '')
+  // latex export is for converting Typst projects to LaTeX; all others are for LaTeX projects
+  const isProjectTypeMatch =
+    conversionType === 'latex' ? compiler === 'typst' : isLatexProject
   const getRootDocInfo = useRootDoc()
   const { openDocs } = useEditorManagerContext()
   const downloadConversion = useConvertProject(
@@ -37,7 +40,7 @@ export const ExportProjectWithConversionButton: FC<
     splitTestEnabledIfNeeded &&
     enablePandocConversions &&
     !anonymous &&
-    isLatexProject
+    isProjectTypeMatch
 
   useCommandProvider(
     () =>

services/web/frontend/js/features/ide-react/components/toolbar/menu-bar.tsx

@@ -98,6 +98,7 @@ export const ToolbarMenuBar = () => {
               'export-as-markdown',
               'export-as-html',
               'export-as-typst',
+              'export-as-latex',
             ],
           },
         ],

services/web/frontend/js/features/ide-react/components/toolbar/project-title.tsx

@@ -100,6 +100,11 @@ export const ToolbarProjectTitle = () => {
           label={t('export_as_typst')}
           menuBarId="export-as-typst"
         />
+        <ExportProjectWithConversionButton
+          conversionType="latex"
+          label={t('export_as_latex')}
+          menuBarId="export-as-latex"
+        />
         <DropdownDivider />
         <DuplicateProject />
         <OLDropdownMenuItem

services/web/frontend/js/features/ide-react/hooks/use-convert-project.ts

@@ -16,7 +16,7 @@ import { OpenDocuments } from '../editor/open-documents'
 const SLOW_CONVERSION_THRESHOLD = 2000
 
 export default function useConvertProject(
-  type: 'docx' | 'markdown' | 'html' | 'typst',
+  type: 'docx' | 'markdown' | 'html' | 'typst' | 'latex',
   openDocs: OpenDocuments,
   getRootDocInfo: () => RootDocInfo
 ) {

services/web/locales/en.json

@@ -879,6 +879,7 @@
   "export_as_docx": "Export as Word document (.docx)",
   "export_as_html": "Export as HTML (.html)",
   "export_as_typst": "Export as Typst",
+  "export_as_latex": "Export as LaTeX (.tex)",
   "export_as_markdown": "Export as Markdown (.md)",
   "export_csv": "Export CSV",
   "export_project_to_github": "Export Project to GitHub",

services/web/locales/fr.json

@@ -882,6 +882,7 @@
   "export_as_docx": "Exporter sous forme de document Word (.docx)",
   "export_as_html": "Exporter au format HTML (.html)",
   "export_as_typst": "Exporter en Typst",
+  "export_as_latex": "Exporter en LaTeX (.tex)",
   "export_as_markdown": "Exporter en Markdown (.md)",
   "export_csv": "Exporter en CSV",
   "export_project_to_github": "Exporter le projet vers GitHub",