Show PR numbers without the # and make header buttons icon-only

PR badges in the sidebar rows, hover card, and right-sidebar PR tab now
show the number alone. The Scripts and Open-in-editor header buttons drop
their labels and gain a min height so they keep the same size icon-only.

packages/app/src/components/sidebar-workspace-list.tsx

@@ -335,7 +335,7 @@ export function PrBadge({ hint }: { hint: PrHint }) {
         <ThemedGitPullRequest size={12} uniProps={iconUniProps} />
       )}
       <Text style={textStyle} numberOfLines={1}>
-        #{hint.number}
+        {hint.number}
       </Text>
     </Pressable>
   );

packages/app/src/components/sidebar/sidebar-workspace-row-content.tsx

@@ -315,7 +315,7 @@ function PrBadge({ hint }: { hint: PrHint }) {
         <ThemedGitPullRequest size={12} uniProps={iconUniProps} />
       )}
       <Text style={textStyle} numberOfLines={1}>
-        #{hint.number}
+        {hint.number}
       </Text>
     </Pressable>
   );