[CmdPal] UX tweaks (#40381)

Based on guidance from the design team, this PR introduces a bunch of
small UX tweaks:

- Standardizing body text on 14px (e.g. for the Adaptive Cards related
code).
- Left align all content in the details pane
- Brush tweaks to the hotkey / tags for better visibility


![image](https://github.com/user-attachments/assets/4d9bf699-29bb-42e0-af96-b9b72c34f259)


![image](https://github.com/user-attachments/assets/905a268b-2e29-408c-a301-10a98b5885f1)


![image](https://github.com/user-attachments/assets/b9050693-f4bb-4d74-8701-fb30b46698e0)


![image](https://github.com/user-attachments/assets/5f6f93a0-1d6e-4476-bad5-dc7a9e179e92)

Closes #38858

src/modules/cmdpal/Microsoft.CmdPal.UI/Controls/AdaptiveCardsConfig.cs

@@ -38,7 +38,7 @@ public sealed class AdaptiveCardsConfig
       "fontFamily": "'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif",
       "fontSizes": {
         "small": 12,
-        "default": 12,
+        "default": 14,
         "medium": 14,
         "large": 20,
         "extraLarge": 26
@@ -199,7 +199,7 @@ public sealed class AdaptiveCardsConfig
       "fontFamily": "'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif",
       "fontSizes": {
         "small": 12,
-        "default": 12,
+        "default": 14,
         "medium": 14,
         "large": 20,
         "extraLarge": 26