feat: enhance email and contact detail views with snippet repair functionality

- Updated email and contact detail views to utilize the repairSnippet function for improved snippet display.
- Refactored email-view-messages to ensure consistent snippet formatting across different components.
- Enhanced mail-mime-body utility to include additional repair logic for handling UTF-8 mojibake, improving text rendering quality.

components/gmail/contacts/contact-detail-view.tsx

@@ -22,6 +22,7 @@ import { useContactsList } from "@/lib/contacts/use-contacts-list"
 import { ContactAvatar } from "@/components/gmail/contacts/contact-avatar"
 import { fullContactDisplayName } from "@/lib/contacts/types"
 import { useMailSearch } from "@/lib/api/hooks/use-mail-queries"
+import { repairSnippet } from "@/lib/mail-mime-body"
 import { useComposeActions } from "@/lib/compose-context"
 import { useNavStore } from "@/lib/stores/nav-store"
 import {
@@ -90,7 +91,7 @@ export function ContactDetailView({ contactId }: ContactDetailViewProps) {
     return searchResult.data.slice(0, 10).map((msg) => ({
       id: msg.id,
       subject: msg.subject,
-      preview: msg.snippet,
+      preview: repairSnippet(msg.snippet) ?? msg.snippet,
       date: msg.date,
     }))
   }, [searchResult])

components/gmail/email-view.tsx

@@ -103,7 +103,7 @@ function apiToLegacyEmail(
         senderEmail: m.from[0]?.address ?? "",
         date: m.date,
         body: m.body_html ?? m.body_text ?? "",
-        preview: m.snippet,
+        preview: repairSnippet(m.snippet) ?? m.snippet,
       })),
   }
 }

components/gmail/email-view/email-view-messages.tsx

@@ -23,6 +23,7 @@ import {
   type MessageHeaderDetails,
 } from "@/lib/mail-message-header-details"
 import type { EmailAttachment } from "@/lib/email-data"
+import { repairMimeBodies, repairSnippet } from "@/lib/mail-mime-body"
 import { ContactHoverCard } from "@/components/gmail/contact-hover-card"
 import { EmailViewMessageToolbar } from "@/components/gmail/email-view/email-view-toolbar"
 import { MessageBodyContent } from "@/components/gmail/email-view/message-body-content"
@@ -31,7 +32,6 @@ import {
   MAIL_MESSAGE_HOVER_CLASS,
   MAIL_TOOLTIP_CONTENT_CLASS,
 } from "@/lib/mail-chrome-classes"
-import { repairMimeBodies } from "@/lib/mail-mime-body"
 import { plainTextToDisplayHtml } from "@/lib/mail-plain-text-html"
 
 export function plainTextBodyFallback(
@@ -47,8 +47,9 @@ export function formatApiMessageBody(
   snippet: string | undefined,
   loading: boolean
 ): string {
-  const snippetHtml = snippet?.trim()
-    ? `<p style="color:var(--muted-foreground);">${snippet.trim()}</p>`
+  const preview = repairSnippet(snippet) ?? snippet
+  const snippetHtml = preview?.trim()
+    ? `<p style="color:var(--muted-foreground);">${preview.trim()}</p>`
     : ""
 
   if (loading) {
@@ -62,13 +63,13 @@ export function formatApiMessageBody(
     return plainTextToDisplayHtml(text)
   }
   if (full) {
-    const s = snippet?.trim()
+    const s = preview?.trim()
     if (s) {
       return `<p style="color:var(--muted-foreground);">${s}</p>`
     }
     return `<p style="color:var(--muted-foreground);">Ce message n’a pas de contenu.</p>`
   }
-  const s = snippet?.trim()
+  const s = preview?.trim()
   return s
     ? `<p style="color:var(--muted-foreground);">${s}</p>`
     : ""
@@ -242,7 +243,9 @@ export function CollapsedMessage({
             />
           </div>
         </div>
-        <p className="min-w-0 truncate text-sm leading-snug text-muted-foreground">{message.snippet}</p>
+        <p className="min-w-0 truncate text-sm leading-snug text-muted-foreground">
+          {repairSnippet(message.snippet) ?? message.snippet}
+        </p>
       </div>
     </div>
   )

lib/mail-mime-body.ts

@@ -55,17 +55,55 @@ function decodeBytesToUtf8(bytes: Uint8Array, charset = ""): string {
   }
 }
 
+const UTF8_MOJIBAKE_PAIR_RE = /[\u00C2\u00C3][\u0080-\u00BF]/
+
+function looksLikeUtf8Mojibake(s: string): boolean {
+  return UTF8_MOJIBAKE_PAIR_RE.test(s)
+}
+
+/** UTF-8 misread as Latin-1: "réactivité" → "réactivité". */
+function repairUtf8Mojibake(s: string): string {
+  if (!s || !looksLikeUtf8Mojibake(s)) return s
+  let out = ""
+  for (let i = 0; i < s.length; i++) {
+    const code = s.charCodeAt(i)
+    if ((code === 0xc2 || code === 0xc3) && i + 1 < s.length) {
+      const next = s.charCodeAt(i + 1)
+      if (next >= 0x80 && next <= 0xbf) {
+        const bytes = new Uint8Array([code, next])
+        try {
+          out += new TextDecoder("utf-8", { fatal: true }).decode(bytes)
+          i++
+          continue
+        } catch {
+          /* keep raw chars */
+        }
+      }
+    }
+    out += s[i]!
+  }
+  if (out === s) return s
+  return repairLoneMojibakeLeaders(out)
+}
+
+function repairLoneMojibakeLeaders(s: string): string {
+  return s
+    .replace(/\u00C3(?=[\s,.;:!?])/g, "à")
+    .replace(/\u00C2(?=[\s,.;:!?])/g, "Â")
+}
+
 function repairLegacyCharsetString(s: string): string {
   if (!s) return s
+  let repaired = s
   try {
     new TextDecoder("utf-8", { fatal: true }).decode(
       Uint8Array.from(s, (c) => c.charCodeAt(0) & 0xff)
     )
-    return s
   } catch {
     const bytes = Uint8Array.from(s, (c) => c.charCodeAt(0) & 0xff)
-    return decodeBytesToUtf8(bytes)
+    repaired = decodeBytesToUtf8(bytes)
   }
+  return repairUtf8Mojibake(repaired)
 }
 
 function decodeBase64Part(encoded: string, charset = ""): string {
@@ -203,13 +241,29 @@ export function repairMimeBodies(
   text = stripInvisibleTextRuns(text)
 
   if (!looksLikeRawMime(text) && !looksLikeRawMime(html)) {
-    return { bodyText: text || bodyText, bodyHtml: html || bodyHtml }
+    return finalizeMimeBodies(text, bodyText, html, bodyHtml)
   }
   const parsed = parseEmbeddedMime(text || html)
-  if (!parsed) return { bodyText: text || bodyText, bodyHtml: html || bodyHtml }
+  if (!parsed) return finalizeMimeBodies(text, bodyText, html, bodyHtml)
+  return finalizeMimeBodies(
+    parsed.text || text || bodyText,
+    bodyText,
+    parsed.html || html || bodyHtml,
+    bodyHtml
+  )
+}
+
+function finalizeMimeBodies(
+  text: string | undefined,
+  bodyText: string | undefined,
+  html: string | undefined,
+  bodyHtml: string | undefined
+): { bodyText?: string; bodyHtml?: string } {
+  const outText = repairUtf8Mojibake(repairLegacyCharsetString(text?.trim() ?? ""))
+  const outHtml = repairUtf8Mojibake(repairLegacyCharsetString(html?.trim() ?? ""))
   return {
-    bodyText: parsed.text || text || bodyText,
-    bodyHtml: parsed.html || html || bodyHtml,
+    bodyText: outText || bodyText,
+    bodyHtml: outHtml || bodyHtml,
   }
 }
 
@@ -418,6 +472,6 @@ export function repairSnippet(snippet?: string): string | undefined {
   const decoded = decodeBareBase64IfNeeded(qp)
   const raw = decoded !== trimmed ? decoded : snippet
   const cleaned = stripInvisibleTextRuns(raw)
-  const polished = polishSnippetPreview(cleaned)
+  const polished = repairUtf8Mojibake(polishSnippetPreview(cleaned))
   return polished || undefined
 }