Select Color: Phosphor eyedropper icon; load button and page arrows in active-tab colours

- The pipette is Phosphor Icons' "eyedropper" (regular, MIT); its
  licence is in assets/icons/ui/LICENSE-phosphor.txt and the SVG header.
- The load-book button and the page strip's up/down arrows use the active
  tab's colours (background.strong and its text colour), slightly darker
  on hover.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013rGmDUNr1hUf4zo1X3dak8

assets/icons/ui/LICENSE-phosphor.txt

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2023 Phosphor Icons
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

assets/icons/ui/eyedropper.svg

@@ -1 +1,2 @@
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="#B4B6B9" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><path d="M14.5 6.5l3 3"/><path d="M13 5l2.6-2.6a2.1 2.1 0 0 1 3 0l3 3a2.1 2.1 0 0 1 0 3L19 11"/><path d="M13 5l6 6"/><path d="M16 8L6.5 17.5 4 18l.5-2.5L14 6"/><path d="M4 18l-1.5 1.5"/></svg>
+<!-- Phosphor Icons "eyedropper" (regular), MIT License, Copyright (c) 2023 Phosphor Icons, https://github.com/phosphor-icons/core. See LICENSE-phosphor.txt. -->
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 256" fill="#B4B6B9"><path d="M224,67.3a35.79,35.79,0,0,0-11.26-25.66c-14-13.28-36.72-12.78-50.62,1.13L142.8,62.2a24,24,0,0,0-33.14.77l-9,9a16,16,0,0,0,0,22.64l2,2.06-51,51a39.75,39.75,0,0,0-10.53,38l-8,18.41A13.68,13.68,0,0,0,36,219.3a15.92,15.92,0,0,0,17.71,3.35L71.23,215a39.89,39.89,0,0,0,37.06-10.75l51-51,2.06,2.06a16,16,0,0,0,22.62,0l9-9a24,24,0,0,0,.74-33.18l19.75-19.87A35.75,35.75,0,0,0,224,67.3ZM97,193a24,24,0,0,1-24,6,8,8,0,0,0-5.55.31l-18.1,7.91L57,189.41a8,8,0,0,0,.25-5.75A23.88,23.88,0,0,1,63,159l51-51,33.94,34ZM202.13,82l-25.37,25.52a8,8,0,0,0,0,11.3l4.89,4.89a8,8,0,0,1,0,11.32l-9,9L112,83.26l9-9a8,8,0,0,1,11.31,0l4.89,4.89a8,8,0,0,0,11.33,0l24.94-25.09c7.81-7.82,20.5-8.18,28.29-.81a20,20,0,0,1,.39,28.7Z"/></svg>

src/ui/color_select/picker.rs

@@ -730,7 +730,7 @@ impl ColorPicker {
         let load_button = |content: Element<'static, Message>| {
             button(content)
                 .on_press(picker_msg(ColorPickerMsg::LoadBook))
-                .style(button::secondary)
+                .style(tab_button_style)
         };
         let Some(book) = self.books.get(self.book) else {
             return container(
@@ -761,7 +761,7 @@ impl ColorPicker {
                 .width(Length::Fill),
                 load_button(
                     container(
-                        secondary_icon(crate::ui::icons::themed_handle(
+                        tab_icon(crate::ui::icons::themed_handle(
                             crate::ui::icons::FOLDER_OPEN
                         ))
                         .width(16)
@@ -854,14 +854,14 @@ impl ColorPicker {
                 .width(9)
                 .height(5)
                 .style(|theme: &Theme, _status| svg::Style {
-                    color: Some(theme.palette().secondary.base.text),
+                    color: Some(theme.palette().background.strong.text),
                 }),
             )
             .on_press(picker_msg(ColorPickerMsg::BookPage(page)))
             .width(Length::Fill)
             .height(18)
             .padding([6, 8])
-            .style(button::secondary)
+            .style(tab_button_style)
         };
         let strip = column![
             arrow("M0 4L3.5 0L7 4z", self.book_page.saturating_sub(1)),
@@ -1139,10 +1139,20 @@ fn search_box<'a>(
     .into()
 }
 
-/// An icon in the text colour of a secondary button, so it reads on it.
-fn secondary_icon<'a>(handle: svg::Handle) -> svg::Svg<'a> {
+/// A small button in the colours of the active tab: the load button and
+/// the page arrows.
+fn tab_button_style(theme: &Theme, status: button::Status) -> button::Style {
+    let mut style = segment_style(theme, true, status);
+    if matches!(status, button::Status::Hovered | button::Status::Pressed) {
+        style.background = Some(theme.palette().background.stronger.color.into());
+    }
+    style
+}
+
+/// An icon in the active tab's text colour, for `tab_button_style`.
+fn tab_icon<'a>(handle: svg::Handle) -> svg::Svg<'a> {
     svg(handle).style(|theme: &Theme, _status| svg::Style {
-        color: Some(theme.palette().secondary.base.text),
+        color: Some(theme.palette().background.strong.text),
     })
 }