feat(frontend): add archive format family, compression control, and fixed double-extension parsing

Also adds a --color-family-archives CSS variable (light + dark) that
the plan didn't call out explicitly but is needed for the new family
tile/icon to render with a color instead of falling back silently.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

frontend/src/components/FileConfigCard.jsx

@@ -1,14 +1,12 @@
 import { X } from '@phosphor-icons/react';
 import { formatBytes } from '../utils/formatBytes.js';
 import { fileTypeMeta } from '../utils/fileFamily.js';
+import { extensionOf } from '../utils/archiveExtensions.js';
 
 const QUALITY_FORMATS = ['jpg', 'jpeg', 'webp', 'avif', 'tiff'];
 const ICON_SIZES = [16, 32, 48, 256, 512];
 const DEFAULT_ICON_SIZE = 256;
-
-function extensionOf(fileName) {
-  return fileName.split('.').pop();
-}
+const ARCHIVE_COMPRESSION_FORMATS = ['zip', 'tar.gz', 'tar.bz2', '7z', 'tar.7z'];
 
 function rangeProgress(value, min, max) {
   return `${((value - min) / (max - min)) * 100}%`;
@@ -93,6 +91,16 @@ export function FileConfigCard({ item, index, t, onTargetFormatChange, onQuality
             />
           )}
 
+          {ARCHIVE_COMPRESSION_FORMATS.includes(item.targetFormat) && (
+            <RangeField
+              label={t('quality.compression')}
+              value={item.quality}
+              min={0}
+              max={9}
+              onChange={(value) => onQualityChange(index, value)}
+            />
+          )}
+
           {item.targetFormat === 'ico' && (
             <div className="chip-field">
               <span>{t('quality.iconSize')}</span>

frontend/src/components/FormatsGrid.jsx

@@ -1,5 +1,5 @@
 import { useTranslation } from 'react-i18next';
-import { Image, FileText, TextAa, BookOpen } from '@phosphor-icons/react';
+import { Image, FileText, TextAa, BookOpen, Archive } from '@phosphor-icons/react';
 import { FORMAT_FAMILIES } from '../data/formats.js';
 
 const FAMILY_ICONS = {
@@ -7,6 +7,7 @@ const FAMILY_ICONS = {
   documents: FileText,
   fonts: TextAa,
   ebooks: BookOpen,
+  archives: Archive,
 };
 
 export function FormatsGrid() {

frontend/src/data/formats.js

@@ -15,4 +15,8 @@ export const FORMAT_FAMILIES = [
     key: 'ebooks',
     formats: ['epub', 'fb2', 'lrf', 'mobi', 'pdb', 'rb', 'snb', 'tcr', 'azw3', 'pdf'],
   },
+  {
+    key: 'archives',
+    formats: ['zip', 'tar', 'tar.gz', 'tar.bz2', '7z', 'tar.7z', 'rar'],
+  },
 ];

frontend/src/index.css

@@ -23,6 +23,7 @@
   --color-family-documents: var(--color-aurora-cyan);
   --color-family-fonts: #f5a524;
   --color-family-ebooks: #10b981;
+  --color-family-archives: #64748b;
 
   --font-sans: 'Plus Jakarta Sans', system-ui, 'Segoe UI', Roboto, sans-serif;
   --font-display: 'Bricolage Grotesque', var(--font-sans);
@@ -51,6 +52,7 @@
   --color-family-documents: var(--color-aurora-cyan);
   --color-family-fonts: #ffb84d;
   --color-family-ebooks: #34d399;
+  --color-family-archives: #94a3b8;
 }
 
 *, *::before, *::after {

frontend/src/locales/en.json

@@ -40,7 +40,8 @@
     "images": "Images",
     "documents": "Documents",
     "fonts": "Fonts",
-    "ebooks": "Ebooks"
+    "ebooks": "Ebooks",
+    "archives": "Archives"
   },
   "footer": {
     "rights": "Ombrora Convert — Online file conversion"

frontend/src/locales/fr.json

@@ -40,7 +40,8 @@
     "images": "Images",
     "documents": "Documents",
     "fonts": "Polices",
-    "ebooks": "Ebooks"
+    "ebooks": "Ebooks",
+    "archives": "Archives"
   },
   "footer": {
     "rights": "Ombrora Convert — Conversion de fichiers en ligne"

frontend/src/pages/HomePage.jsx

@@ -9,6 +9,7 @@ import { ReassuranceStrip } from '../components/ReassuranceStrip.jsx';
 import { FormatsGrid } from '../components/FormatsGrid.jsx';
 import { FormatMarquee } from '../components/FormatMarquee.jsx';
 import { SeoHead } from '../components/SeoHead.jsx';
+import { extensionOf } from '../utils/archiveExtensions.js';
 import '../styles/home.css';
 import '../styles/sections.css';
 
@@ -19,14 +20,15 @@ const DEFAULT_QUALITY = {
   avif: 50,
   tiff: 80,
   png: 6,
+  zip: 6,
+  'tar.gz': 6,
+  'tar.bz2': 9,
+  '7z': 5,
+  'tar.7z': 5,
 };
 
 const DEFAULT_ICON_SIZE = 256;
 
-function extensionOf(fileName) {
-  return fileName.split('.').pop().toLowerCase();
-}
-
 function defaultQualityFor(targetFormat) {
   return DEFAULT_QUALITY[targetFormat] ?? null;
 }

frontend/src/utils/archiveExtensions.js

@@ -0,0 +1,7 @@
+const DOUBLE_EXTENSIONS = ['tar.gz', 'tar.bz2', 'tar.7z'];
+
+export function extensionOf(filename) {
+  const lower = filename.toLowerCase();
+  const match = DOUBLE_EXTENSIONS.find((ext) => lower.endsWith(`.${ext}`));
+  return match ?? filename.split('.').pop().toLowerCase();
+}

frontend/src/utils/fileFamily.js

@@ -1,4 +1,4 @@
-import { Image, FileText, TextAa, BookOpen, File as FileIcon } from '@phosphor-icons/react';
+import { Image, FileText, TextAa, BookOpen, Archive, File as FileIcon } from '@phosphor-icons/react';
 import { FORMAT_FAMILIES } from '../data/formats.js';
 
 const FAMILY_ICONS = {
@@ -6,6 +6,7 @@ const FAMILY_ICONS = {
   documents: FileText,
   fonts: TextAa,
   ebooks: BookOpen,
+  archives: Archive,
 };
 
 export function familyForExtension(extension) {