Fix Quarto compiler integration: UI, root doc detection, type safety

- compiler-setting.tsx: replace hardcoded LaTeX compiler list with a
  single Quarto option; drop now-unused getMeta/lodash imports
- project-settings.ts: add 'quarto' to ProjectCompiler union type
- ClsiManager: detect main.qmd as a default root document (preferred
  over main.tex); replace hasMainFile boolean with detectedMainFile
  so we know which filename to use
- settings.defaults.js: add 'qmd' to validRootDocExtensions so .qmd
  files appear as selectable root documents in the UI
- ProjectRootDocManager: sort main.qmd before main.tex in the root
  doc candidate list

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

services/web/app/src/Features/Compile/ClsiManager.mjs

@@ -1068,7 +1068,7 @@ function _finaliseRequest(projectId, options, project, docs, files) {
   let flags
   let rootResourcePath = options.rootResourcePath
   let rootResourcePathOverride = null
-  let hasMainFile = false
+  let detectedMainFile = null
   let numberOfDocsInProject = 0
 
   for (let path in docs) {
@@ -1094,8 +1094,11 @@ function _finaliseRequest(projectId, options, project, docs, files) {
     ) {
       rootResourcePathOverride = path
     }
-    if (path === 'main.tex') {
-      hasMainFile = true
+    // prefer main.qmd over main.tex as the default root document
+    if (path === 'main.qmd') {
+      detectedMainFile = 'main.qmd'
+    } else if (path === 'main.tex' && detectedMainFile == null) {
+      detectedMainFile = 'main.tex'
     }
   }
 
@@ -1103,8 +1106,8 @@ function _finaliseRequest(projectId, options, project, docs, files) {
     rootResourcePath = rootResourcePathOverride
   }
   if (rootResourcePath == null) {
-    if (hasMainFile) {
-      rootResourcePath = 'main.tex'
+    if (detectedMainFile != null) {
+      rootResourcePath = detectedMainFile
     } else if (numberOfDocsInProject === 1) {
       // only one file, must be the main document
       for (const path in docs) {

services/web/app/src/Features/Project/ProjectRootDocManager.mjs

@@ -191,12 +191,14 @@ function _rootDocSort(a, b) {
   if (a.elements !== b.elements) {
     return a.elements - b.elements
   }
-  // ensure main.tex is at the start of each folder
-  if (a.name === 'main.tex' && b.name !== 'main.tex') {
-    return -1
-  }
-  if (a.name !== 'main.tex' && b.name === 'main.tex') {
-    return 1
+  // prefer main.qmd, then main.tex, at the start of each folder
+  const PREFERRED = ['main.qmd', 'main.tex']
+  const aIdx = PREFERRED.indexOf(a.name)
+  const bIdx = PREFERRED.indexOf(b.name)
+  if (aIdx !== bIdx) {
+    if (aIdx === -1) return 1
+    if (bIdx === -1) return -1
+    return aIdx - bIdx
   }
   // prefer smaller files
   if (a.size !== b.size) {

services/web/config/settings.defaults.js

@@ -889,7 +889,7 @@ module.exports = {
     process.env.FILE_IGNORE_PATTERN ||
     '**/{{__MACOSX,.git,.texpadtmp,.R}{,/**},.!(latexmkrc),*.{dvi,aux,log,toc,out,pdfsync,synctex,synctex(busy),fdb_latexmk,fls,nlo,ind,glo,gls,glg,bbl,blg,doc,docx,gz,swp}}',
 
-  validRootDocExtensions: ['tex', 'Rtex', 'ltx', 'Rnw'],
+  validRootDocExtensions: ['qmd', 'tex', 'Rtex', 'ltx', 'Rnw'],
 
   emailConfirmationDisabled:
     process.env.EMAIL_CONFIRMATION_DISABLED === 'true' || false,

services/web/frontend/js/features/settings/components/compiler-settings/compiler-setting.tsx

@@ -6,20 +6,8 @@ import { useTranslation } from 'react-i18next'
 import { usePermissionsContext } from '@/features/ide-react/context/permissions-context'
 import { ProjectCompiler } from '@ol-types/project-settings'
 import { useSetCompilationSettingWithEvent } from '@/features/editor-left-menu/hooks/use-set-compilation-setting'
-import getMeta from '@/utils/meta'
-import _ from 'lodash'
-
 function getCompilerOptions(): Option<ProjectCompiler>[] {
-  const compilerOptions = ['pdfLaTeX', 'LaTeX', 'XeLaTeX', 'LuaLaTeX']
-  const defaultCompiler = getMeta('ol-defaultLatexCompiler') as ProjectCompiler
-  const sortedOptions = _.sortBy(
-    compilerOptions,
-    option => option.toLowerCase() !== defaultCompiler.toLowerCase()
-  )
-  return sortedOptions.map(option => ({
-    value: option.toLowerCase() as ProjectCompiler,
-    label: option,
-  }))
+  return [{ value: 'quarto', label: 'Quarto' }]
 }
 
 export default function CompilerSetting() {

services/web/types/project-settings.ts

@@ -17,7 +17,7 @@ export type MainDocument = {
   path: string
 }
 
-export type ProjectCompiler = 'pdflatex' | 'latex' | 'xelatex' | 'lualatex'
+export type ProjectCompiler = 'quarto' | 'pdflatex' | 'latex' | 'xelatex' | 'lualatex'
 
 export type OverallThemeMeta = {
   name: string