chore(copy): standardize metadata formatting and descriptions

- Replace middle dots (·) and em-dashes (—) with pipes (|) and standard punctuation in page titles, descriptions, and image alt texts.
- Shorten the homepage description to be more concise and direct.
- Update file share description phrasing for better readability, changing "click to preview" to "Open to preview" and capitalizing "Expires".

backend/libs/handlers/pages.go

@@ -62,10 +62,10 @@ func (a *App) Home(w http.ResponseWriter, r *http.Request) {
 	expiryOptions, defaultExpiry := a.homeExpiryOptions(settings, user, loggedIn, isAdmin)
 	a.renderPage(w, r, http.StatusOK, "home.html", web.PageData{
 		Title:        "Upload your files",
-		Description:  "Upload and share files fast. Drop a file, get a link — private, temporary transfers that expire on your terms.",
+		Description:  "Upload and share files quickly. Drop a file, get a link.",
 		CanonicalURL: absoluteURL(r, "/"),
 		ImageURL:     absoluteURL(r, "/static/og-default.png"),
-		ImageAlt:     "Warp Box — simple file sharing and fast downloads",
+		ImageAlt:     "Warp Box | simple file sharing  and fast downloads",
 		CurrentUser:  currentUser,
 		Data: homeData{
 			MaxUploadSize:        maxUploadSize,