Refactor newsletter HTML generation for improved styling and consistency

- Update the "Top Highlights" section to use new color variables and enhanced padding for better visual appeal.
- Change the eyebrow text for article cards to uppercase for consistency with design standards.
- Adjust padding and margin styles in article cards to improve layout and readability in Outlook-compatible HTML.

app/services/newsletter.py

@@ -746,17 +746,20 @@ def _outlook_highlights(items: list[dict[str, Any]]) -> str:
     for idx, item in enumerate(items[:3], start=1):
         url = _article_url(item.get("title", ""))
         rows += (
-            f'<tr><td {_outlook_td_attrs(bg=OUTLOOK_WHITE, extra_style="padding:2px 0;")}>'
+            f'<tr><td {_outlook_td_attrs(bg=COLOR_TK_ORANGE_LIGHT, extra_style="padding:3px 0;")}>'
             f'{_outlook_font(f"{idx}. ", color=OUTLOOK_ORANGE, bold=True)}'
             f'{_outlook_link(item.get("title", "Ohne Titel"), url, color=OUTLOOK_TEXT, bold=False)}'
             f'</td></tr>'
         )
     return (
         f'<table width="100%" cellpadding="0" cellspacing="0" border="0" '
-        f'bgcolor="{OUTLOOK_WHITE}" style="background-color:{OUTLOOK_WHITE} !important;margin:0 0 8px;" data-ogsb="{OUTLOOK_WHITE}">'
+        f'bgcolor="{COLOR_TK_ORANGE_LIGHT}" style="background-color:{COLOR_TK_ORANGE_LIGHT} !important;'
-        f'<tr><td {_outlook_td_attrs(extra_style="padding:0 0 6px;")}>'
+        f'border:1px solid {COLOR_TK_ORANGE_BORDER};margin:0 0 12px;" data-ogsb="{COLOR_TK_ORANGE_LIGHT}">'
-        f'{_outlook_font("Top Highlights", color=OUTLOOK_ORANGE, size="2", bold=True)}</td></tr>'
+        f'<tr><td {_outlook_td_attrs(bg=COLOR_TK_ORANGE_LIGHT, extra_style="padding:12px 14px 6px;")}>'
-        f'{rows}</table>'
+        f'{_outlook_font("TOP HIGHLIGHTS", color=COLOR_TK_ORANGE_DARK, size="1", bold=True)}</td></tr>'
+        f'<tr><td {_outlook_td_attrs(bg=COLOR_TK_ORANGE_LIGHT, extra_style="padding:0 14px 12px;")}>'
+        f'<table width="100%" cellpadding="0" cellspacing="0" border="0">{rows}</table></td></tr>'
+        f'</table>'
     )
 
 
@@ -809,7 +812,7 @@ def _outlook_section(
 
 def _outlook_article_card(idx: int, item: dict[str, Any], display: DisplayOptions, kind: str) -> str:
     accent = OUTLOOK_ORANGE if kind == "new" else OUTLOOK_GRAY_DARK
-    eyebrow = "Neuer Beitrag" if kind == "new" else "Aktualisierter Beitrag"
+    eyebrow = "NEUER BEITRAG" if kind == "new" else "AKTUALISIERTER BEITRAG"
     title = item.get("title", "Ohne Titel")
     url = _article_url(item.get("title", ""))
     meta = _outlook_meta_line(item, display)
@@ -819,10 +822,10 @@ def _outlook_article_card(idx: int, item: dict[str, Any], display: DisplayOption
     <table width="100%" cellpadding="0" cellspacing="0" border="0" bgcolor="{OUTLOOK_WHITE}" style="background-color:{OUTLOOK_WHITE} !important;border:1px solid {OUTLOOK_BORDER};" data-ogsb="{OUTLOOK_WHITE}">
       <tr>
         <td {_outlook_td_attrs(bg=accent, width="6", extra_style="font-size:0;line-height:0;width:6px;")}>&nbsp;</td>
-        <td {_outlook_td_attrs(extra_style="padding:12px 16px;")}>
+        <td {_outlook_td_attrs(extra_style="padding:16px 20px;")}>
           {_outlook_font(f"{idx}. {eyebrow}", color=accent, size="1", bold=True)}<br>
-          {_outlook_link(title, url, size="3")}{meta_html}<br>
+          <span style="display:inline-block;margin:6px 0 2px;">{_outlook_link(title, url, color=OUTLOOK_TEXT, size="4")}</span>{meta_html}<br>
-          <span style="display:inline-block;margin-top:8px;">{_outlook_cta(url, "Zum Beitrag →")}</span>
+          <span style="display:inline-block;margin-top:12px;">{_outlook_cta(url, "Zum Beitrag →")}</span>
         </td>
       </tr>
     </table>