yoda: warning cleanup sweep (dead code + clippy --fix) (squashed)

Squash of 4 yoda commits:
- 84437e21 yoda: libcosmic-yoda dead-code purge (14->0 warnings)
- 999db0a4 yoda: cosmic-theme cleanup (4->0 warnings) — workspace at 0 warnings total
- 4743bb8e yoda: cargo clippy --fix on libcosmic-yoda (115->33 warnings)
- 675f3b59 chore: reduce local stack warnings

src/widget/dropdown/menu/mod.rs

@@ -474,16 +474,14 @@ where
         match event {
             Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left)) => {
                 let hovered_guard = self.hovered_option.lock().unwrap();
-                if cursor.is_over(layout.bounds()) {
-                    if let Some(index) = *hovered_guard {
+                if cursor.is_over(layout.bounds())
+                    && let Some(index) = *hovered_guard {
                         shell.publish((self.on_selected)(index));
                         if let Some(close_on_selected) = self.close_on_selected.as_ref() {
                             shell.publish(close_on_selected.clone());
                         }
                         shell.capture_event();
-                        return;
                     }
-                }
             }
             Event::Mouse(mouse::Event::CursorMoved { .. }) => {
                 if let Some(cursor_position) = cursor.position_in(layout.bounds()) {
@@ -498,11 +496,10 @@ where
                     let new_hovered_option = (cursor_position.y / option_height) as usize;
                     let mut hovered_guard = self.hovered_option.lock().unwrap();
 
-                    if let Some(on_option_hovered) = self.on_option_hovered {
-                        if *hovered_guard != Some(new_hovered_option) {
+                    if let Some(on_option_hovered) = self.on_option_hovered
+                        && *hovered_guard != Some(new_hovered_option) {
                             shell.publish(on_option_hovered(new_hovered_option));
                         }
-                    }
 
                     *hovered_guard = Some(new_hovered_option);
                 }
@@ -526,7 +523,6 @@ where
                             shell.publish(close_on_selected.clone());
                         }
                         shell.capture_event();
-                        return;
                     }
                 }
             }

src/widget/dropdown/multi/menu.rs

@@ -343,13 +343,11 @@ where
 
         match event {
             Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left)) => {
-                if cursor.is_over(bounds) {
-                    if let Some(item) = self.hovered_option.as_ref() {
+                if cursor.is_over(bounds)
+                    && let Some(item) = self.hovered_option.as_ref() {
                         shell.publish((self.on_selected)(item.clone()));
                         shell.capture_event();
-                        return;
                     }
-                }
             }
             Event::Mouse(mouse::Event::CursorMoved { .. }) => {
                 if let Some(cursor_position) = cursor.position_in(bounds) {

src/widget/dropdown/multi/widget.rs

@@ -6,7 +6,7 @@ use super::menu::{self, Menu};
 use crate::widget::icon;
 use derive_setters::Setters;
 use iced_core::event::Event;
-use iced_core::text::{self, Paragraph, Text};
+use iced_core::text::{self, Text};
 use iced_core::widget::tree::{self, Tree};
 use iced_core::{
     Clipboard, Layout, Length, Padding, Pixels, Rectangle, Shadow, Shell, Size, Vector, Widget,
@@ -127,7 +127,7 @@ impl<'a, S: AsRef<str>, Message: 'a, Item: Clone + PartialEq + 'static>
         _viewport: &Rectangle,
     ) {
         update(
-            &event,
+            event,
             layout,
             cursor,
             shell,

src/widget/dropdown/widget.rs

@@ -263,7 +263,7 @@ where
         _viewport: &Rectangle,
     ) {
         update::<S, Message, AppMessage>(
-            &event,
+            event,
             layout,
             cursor,
             shell,