Add new pin and unpin icons (#17445)

This PR adds new SVGs for the pin and unpin icons, using a custom-made
one in a smaller size, and thus removing the `PinAlt` one I added just
recently. I also tweak the outline panel pin icon button tooltip strings
a bit.

Release Notes:

- N/A

crates/outline_panel/src/outline_panel.rs

@@ -4056,7 +4056,7 @@ impl Render for OutlinePanel {
         .child(
             v_flex().child(horizontal_separator(cx)).child(
                 h_flex().p_2().child(self.filter_editor.clone()).child(
-                    div().border_1().child(
+                    div().child(
                         IconButton::new(
                             "outline-panel-menu",
                             if pinned {
@@ -4066,7 +4066,14 @@ impl Render for OutlinePanel {
                             },
                         )
                         .tooltip(move |cx| {
-                            Tooltip::text(if pinned { "Unpin" } else { "Pin active editor" }, cx)
+                            Tooltip::text(
+                                if pinned {
+                                    "Unpin Outline"
+                                } else {
+                                    "Pin Active Outline"
+                                },
+                                cx,
+                            )
                         })
                         .shape(IconButtonShape::Square)
                         .on_click(cx.listener(|outline_panel, _, cx| {

crates/ui/src/components/icon.rs

@@ -213,7 +213,6 @@ pub enum IconName {
     Pencil,
     Person,
     Pin,
-    PinAlt,
     Play,
     Plus,
     PocketKnife,
@@ -386,7 +385,6 @@ impl IconName {
             IconName::Pencil => "icons/pencil.svg",
             IconName::Person => "icons/person.svg",
             IconName::Pin => "icons/pin.svg",
-            IconName::PinAlt => "icons/pin_alt.svg",
             IconName::Play => "icons/play.svg",
             IconName::Plus => "icons/plus.svg",
             IconName::PocketKnife => "icons/pocket_knife.svg",

crates/workspace/src/pane.rs

@@ -1906,7 +1906,7 @@ impl Pane {
             .start_slot::<Indicator>(indicator)
             .map(|this| {
                 let end_slot = if is_pinned {
-                    IconButton::new("unpin tab", IconName::PinAlt)
+                    IconButton::new("unpin tab", IconName::Pin)
                         .shape(IconButtonShape::Square)
                         .icon_color(Color::Muted)
                         .size(ButtonSize::None)