Fix bible reader version filtering and improve UI

- Fix API to show all 1416+ bible versions with language filtering toggle
- Add default language-specific filtering with option to show all versions
- Fix books API to work with cross-language version selection
- Add toggle button with visual feedback and version count display
- Improve dropdown scrolling and add language indicators
- Maintain backward compatibility while fixing core functionality

🤖 Generated with [Claude Code](https://claude.ai/code)

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

app/[locale]/bible/reader.tsx

@@ -137,6 +137,7 @@ export default function BibleReaderNew() {
   const [verses, setVerses] = useState<BibleVerse[]>([])
   const [loading, setLoading] = useState(true)
   const [versionsLoading, setVersionsLoading] = useState(true)
+  const [showAllVersions, setShowAllVersions] = useState(false)
 
   // UI state
   const [settingsOpen, setSettingsOpen] = useState(false)
@@ -216,18 +217,25 @@ export default function BibleReaderNew() {
     return () => window.removeEventListener('scroll', handleScroll)
   }, [])
 
-  // Fetch all bible versions
+  // Fetch versions based on showAllVersions state and locale
   useEffect(() => {
     setVersionsLoading(true)
-    fetch(`/api/bible/versions?all=true`)
+    const url = showAllVersions
+      ? '/api/bible/versions?all=true'
+      : `/api/bible/versions?language=${locale}`
+
+    fetch(url)
       .then(res => res.json())
       .then(data => {
         if (data.success && data.versions) {
           setVersions(data.versions)
-          // Select default version or first available
-          const defaultVersion = data.versions.find((v: BibleVersion) => v.isDefault) || data.versions[0]
-          if (defaultVersion) {
-            setSelectedVersion(defaultVersion.id)
+          // Keep current selection if it exists in new list, otherwise select default/first
+          const currentVersionExists = data.versions.some((v: BibleVersion) => v.id === selectedVersion)
+          if (!currentVersionExists || !selectedVersion) {
+            const defaultVersion = data.versions.find((v: BibleVersion) => v.isDefault) || data.versions[0]
+            if (defaultVersion) {
+              setSelectedVersion(defaultVersion.id)
+            }
           }
         }
         setVersionsLoading(false)
@@ -236,7 +244,7 @@ export default function BibleReaderNew() {
         console.error('Error fetching versions:', err)
         setVersionsLoading(false)
       })
-  }, [locale])
+  }, [locale, showAllVersions, selectedVersion])
 
   // Fetch books when version changes
   useEffect(() => {
@@ -677,36 +685,50 @@ export default function BibleReaderNew() {
       <Box sx={{ display: 'flex', gap: 2, flexWrap: 'wrap', alignItems: 'center', justifyContent: 'center' }}>
         {/* Version Selection */}
         <Box sx={{ flex: { xs: '1 1 100%', sm: '1 1 auto' }, minWidth: { sm: 180, md: 200 } }}>
-          <FormControl fullWidth size="small">
-            <InputLabel>{t('version')}</InputLabel>
-            <Select
-              value={selectedVersion}
-              label={t('version')}
-              onChange={(e) => {
-                setSelectedVersion(e.target.value)
-                // Reset to first book when version changes
-                if (books.length > 0) {
-                  setSelectedBook(books[0].id)
-                  setSelectedChapter(1)
-                  updateUrl(books[0].id, 1, e.target.value)
-                }
-              }}
-              disabled={versionsLoading}
-              MenuProps={{
-                PaperProps: {
-                  style: {
-                    maxHeight: 400,
+          <Box sx={{ display: 'flex', alignItems: 'center', gap: 1, mb: 1 }}>
+            <FormControl fullWidth size="small">
+              <InputLabel>{t('version')}</InputLabel>
+              <Select
+                value={selectedVersion}
+                label={t('version')}
+                onChange={(e) => {
+                  setSelectedVersion(e.target.value)
+                  // Reset to first book when version changes
+                  if (books.length > 0) {
+                    setSelectedBook(books[0].id)
+                    setSelectedChapter(1)
+                    updateUrl(books[0].id, 1, e.target.value)
+                  }
+                }}
+                disabled={versionsLoading}
+                MenuProps={{
+                  PaperProps: {
+                    style: {
+                      maxHeight: 400,
+                    },
                   },
-                },
-              }}
-            >
-              {versions.map((version) => (
-                <MenuItem key={version.id} value={version.id}>
-                  {version.abbreviation} - {version.name} ({version.language.toUpperCase()})
-                </MenuItem>
-              ))}
-            </Select>
-          </FormControl>
+                }}
+              >
+                {versions.map((version) => (
+                  <MenuItem key={version.id} value={version.id}>
+                    {version.abbreviation} - {version.name} ({version.language.toUpperCase()})
+                  </MenuItem>
+                ))}
+              </Select>
+            </FormControl>
+            <Tooltip title={showAllVersions ? 'Show language versions only' : 'Show all versions'}>
+              <IconButton
+                size="small"
+                onClick={() => setShowAllVersions(prev => !prev)}
+                sx={{ color: showAllVersions ? 'primary.main' : 'inherit' }}
+              >
+                <Visibility />
+              </IconButton>
+            </Tooltip>
+          </Box>
+          <Typography variant="caption" color="text.secondary" sx={{ fontSize: '0.7em' }}>
+            {showAllVersions ? `${versions.length} versions (all languages)` : `${versions.length} versions (${locale.toUpperCase()})`}
+          </Typography>
         </Box>
 
         {/* Books Selection */}