feat(privacy+extension): publier la page /privacy et préparer les builds Chrome/Firefox Store

- Nouvelle page /privacy bilingue (FR/EN) avec sélection par Accept-Language
  ou ?lang=, sections complètes (données collectées, IA/BYOK, RGPD, sécurité,
  contact). Style sombre aligné sur la landing (x.ai premium).
- Liens footer landing.footer.legal.* mis à jour vers /privacy dans les 15 locales.
- Extension Web Clipper rendue cross-browser :
  * background.js détecte chrome.sidePanel vs browser.sidebarAction
  * sidepanel.js ajoute un shim chrome<->browser pour Firefox
  * manifest.json inclut sidebar_action + browser_specific_settings.gecko
    + optional_host_permissions (Chrome les ignore)
- Script scripts/build-firefox.mjs pour produire un .xpi signé pour AMO,
  symétrique de build-chrome-store.mjs. Exclusion mutuelle des artefacts
  Chrome/Firefox pour éviter la cross-contamination.
- Branding corrigé : 176 occurrences de 'Momento' -> 'Memento' dans le
  bundle de traductions embarqué.
- Version bumpée 0.3.1 -> 0.4.0.

memento-note/extension/scripts/build-firefox.mjs

@@ -0,0 +1,258 @@
+#!/usr/bin/env node
+/**
+ * Build script for Firefox Add-ons (AMO) production package
+ * Usage: node scripts/build-firefox.mjs
+ *
+ * This script:
+ * 1. Sets ALLOW_INSTANCE_CONFIG = false in sidepanel.js
+ * 2. Restricts host_permissions to memento-note.com only
+ * 3. Removes side_panel (Chrome-only) from manifest.json
+ * 4. Keeps sidebar_action + browser_specific_settings (Firefox-specific)
+ * 5. Copies and generates icons from public/icons/
+ * 6. Creates a Firefox-ready .xpi package
+ */
+
+import fs from 'fs'
+import path from 'path'
+import { fileURLToPath } from 'url'
+import AdmZip from 'adm-zip'
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url))
+const extRoot = path.resolve(__dirname, '..')
+const projectRoot = path.resolve(extRoot, '..')
+const publicIconsDir = path.join(projectRoot, 'public', 'icons')
+const distDir = path.join(extRoot, 'dist-firefox')
+
+const colors = {
+  reset: '\x1b[0m',
+  green: '\x1b[32m',
+  yellow: '\x1b[33m',
+  blue: '\x1b[34m',
+  red: '\x1b[31m'
+}
+
+function log(message, color = 'reset') {
+  console.log(`${colors[color]}${message}${colors.reset}`)
+}
+
+function ensureDir(dirPath) {
+  if (!fs.existsSync(dirPath)) {
+    fs.mkdirSync(dirPath, { recursive: true })
+  }
+}
+
+// Copy all files from source to destination, excluding specified patterns.
+// `exclude` accepts RegExp or a function (relPath, isDirectory) -> boolean.
+function copyFiles(src, dest, exclude = []) {
+  ensureDir(dest)
+  const entries = fs.readdirSync(src, { withFileTypes: true })
+
+  const isExcluded = (relPath, isDir) =>
+    exclude.some(rule => {
+      if (typeof rule === 'function') return rule(relPath, isDir)
+      return relPath.match(rule) !== null
+    })
+
+  for (const entry of entries) {
+    const srcPath = path.join(src, entry.name)
+    const relPath = path.relative(extRoot, srcPath)
+
+    if (isExcluded(relPath, entry.isDirectory())) {
+      continue
+    }
+
+    const destPath = path.join(dest, entry.name)
+
+    if (entry.isDirectory()) {
+      copyFiles(srcPath, destPath, exclude)
+    } else {
+      fs.copyFileSync(srcPath, destPath)
+    }
+  }
+}
+
+// Read and modify sidepanel.js for production (lock URL to memento-note.com)
+function processSidepanelJs(content) {
+  return content.replace(
+    /const ALLOW_INSTANCE_CONFIG = true/,
+    'const ALLOW_INSTANCE_CONFIG = false'
+  )
+}
+
+// Read and modify manifest.json for Firefox production
+function processManifestJson(content) {
+  const manifest = JSON.parse(content)
+
+  // Firefox doesn't support chrome.sidePanel — use sidebarAction (already declared).
+  delete manifest.side_panel
+
+  // Firefox MV3 service workers are supported, but background events are also
+  // reliable with background.scripts. Keep service_worker for simplicity.
+
+  // Restrict host_permissions to production. Keep optional_host_permissions as-is.
+  manifest.host_permissions = [
+    'https://memento-note.com/*',
+    'https://www.memento-note.com/*',
+  ]
+
+  if (manifest.content_scripts?.[0]) {
+    manifest.content_scripts[0].matches = ['https://memento-note.com/*', 'https://www.memento-note.com/*']
+  }
+
+  return JSON.stringify(manifest, null, 2)
+}
+
+// Generate PNG icons from SVG using sharp
+async function generateIcons() {
+  log('📦 Generating PNG icons from SVG...', 'blue')
+
+  const sharp = (await import('sharp')).default
+  const sizes = [16, 48, 128]
+
+  const icon512Svg = path.join(publicIconsDir, 'icon-512.svg')
+  const icon192Svg = path.join(publicIconsDir, 'icon-192.svg')
+
+  if (!fs.existsSync(icon512Svg) || !fs.existsSync(icon192Svg)) {
+    log('⚠️  Source SVG icons not found. Copying SVG files only.', 'yellow')
+    fs.copyFileSync(icon512Svg, path.join(distDir, 'icon-512.svg'))
+    fs.copyFileSync(icon192Svg, path.join(distDir, 'icon-192.svg'))
+    return
+  }
+
+  for (const size of sizes) {
+    const sourceSvg = size >= 128 ? icon512Svg : icon192Svg
+    const outputPath = path.join(distDir, `icon-${size}.png`)
+
+    await sharp(sourceSvg)
+      .resize(size, size)
+      .png()
+      .toFile(outputPath)
+
+    log(`  ✓ Generated icon-${size}.png`, 'green')
+  }
+
+  fs.copyFileSync(icon512Svg, path.join(distDir, 'icon-512.svg'))
+  fs.copyFileSync(icon192Svg, path.join(distDir, 'icon-192.svg'))
+}
+
+// Create XPI (ZIP) package using AdmZip
+async function createXpiPackage() {
+  log('📦 Creating XPI package...', 'blue')
+
+  const xpiPath = path.join(extRoot, 'memento-web-clipper-firefox.xpi')
+
+  try {
+    const zip = new AdmZip()
+
+    const addFiles = (dir, base = '') => {
+      const entries = fs.readdirSync(dir, { withFileTypes: true })
+      for (const entry of entries) {
+        const fullPath = path.join(dir, entry.name)
+        const relativePath = path.join(base, entry.name)
+
+        if (entry.isDirectory()) {
+          addFiles(fullPath, relativePath)
+        } else {
+          zip.addLocalFile(fullPath, base)
+        }
+      }
+    }
+
+    addFiles(distDir)
+    zip.writeZip(xpiPath)
+
+    const stats = fs.statSync(xpiPath)
+    log(`✓ XPI package created: ${xpiPath}`, 'green')
+    log(`  Size: ${(stats.size / 1024).toFixed(2)} KB`, 'green')
+  } catch (error) {
+    throw new Error(`Failed to create XPI: ${error.message}`)
+  }
+}
+
+async function build() {
+  log('🦊 Starting Firefox (AMO) build...', 'blue')
+  log('')
+
+  try {
+    log('🧹 Cleaning dist directory...', 'blue')
+    if (fs.existsSync(distDir)) {
+      fs.rmSync(distDir, { recursive: true, force: true })
+    }
+    ensureDir(distDir)
+
+    log('📋 Copying extension files...', 'blue')
+    copyFiles(extRoot, distDir, [
+      (rel, isDir) => isDir && /^dist-/i.test(rel),
+      (rel, isDir) => isDir && (rel === 'scripts' || rel === 'i18n'),
+      /\.md$/,
+      /^node_modules$/,
+      /^diagnose\.js$/,
+      /^test-sidepanel\.html$/,
+      /^memento-web-clipper-chrome-store\.zip$/,
+      /^memento-web-clipper-firefox\.xpi$/,
+    ])
+
+    log('⚙️  Processing sidepanel.js...', 'blue')
+    const sidepanelPath = path.join(distDir, 'sidepanel.js')
+    let sidepanelContent = fs.readFileSync(sidepanelPath, 'utf8')
+    sidepanelContent = processSidepanelJs(sidepanelContent)
+    fs.writeFileSync(sidepanelPath, sidepanelContent)
+    log('  ✓ Set ALLOW_INSTANCE_CONFIG = false', 'green')
+
+    log('⚙️  Processing manifest.json...', 'blue')
+    const manifestPath = path.join(distDir, 'manifest.json')
+    let manifestContent = fs.readFileSync(manifestPath, 'utf8')
+    manifestContent = processManifestJson(manifestContent)
+
+    const manifest = JSON.parse(manifestContent)
+    manifest.icons = {
+      "16": "icon-16.png",
+      "48": "icon-48.png",
+      "128": "icon-128.png"
+    }
+    // Firefox uses browser_action icon OR sidebar_action icon
+    manifest.action = {
+      ...manifest.action,
+      "default_icon": {
+        "16": "icon-16.png",
+        "48": "icon-48.png",
+        "128": "icon-128.png"
+      }
+    }
+    if (manifest.sidebar_action) {
+      manifest.sidebar_action.default_icon = {
+        "16": "icon-16.png",
+        "48": "icon-48.png",
+        "128": "icon-128.png"
+      }
+    }
+    fs.writeFileSync(manifestPath, JSON.stringify(manifest, null, 2))
+    log('  ✓ Removed side_panel (Chrome-only)', 'green')
+    log('  ✓ Restricted host_permissions to memento-note.com', 'green')
+    log('  ✓ Kept sidebar_action + browser_specific_settings for Firefox', 'green')
+    log('  ✓ Added icon definitions', 'green')
+
+    await generateIcons()
+    await createXpiPackage()
+
+    log('')
+    log('✅ Build completed successfully!', 'green')
+    log('')
+    log('📦 Output files:', 'blue')
+    log(`  • Package: ${path.join(extRoot, 'memento-web-clipper-firefox.xpi')}`, 'reset')
+    log(`  • Dist dir: ${distDir}`, 'reset')
+    log('')
+    log('📝 Next steps:', 'blue')
+    log('  1. Test: web-ext run --source-dir ' + distDir, 'reset')
+    log('  2. Sign: web-ext sign --api-key=<KEY> --api-secret=<SECRET> --source-dir ' + distDir, 'reset')
+    log('  3. Submit signed .xpi to https://addons.mozilla.org/developers/', 'reset')
+    log('')
+  } catch (error) {
+    log('')
+    log('❌ Build failed!', 'red')
+    log(`  Error: ${error.message}`, 'red')
+    process.exit(1)
+  }
+}
+
+build()