feat(find): add find and replace

Closes #583

src/ui/window/find_replace.rs

@@ -0,0 +1,66 @@
+use crate::app::Message;
+use iced::widget::{button, column, row, text, text_input, Space};
+use iced::{Element, Fill};
+
+pub const FIND_INPUT_ID: &str = "find-replace-search";
+
+pub fn view_window<'a>(
+    search: &'a str,
+    replacement: &'a str,
+    status: &'a str,
+) -> Element<'a, Message> {
+    let find_input = text_input("Text to find", search)
+        .id(iced::widget::Id::new(FIND_INPUT_ID))
+        .on_input(Message::FindReplaceSearchChanged)
+        .on_submit(Message::FindReplaceNext)
+        .padding([6, 8])
+        .size(13);
+    let replacement_input = text_input("Replacement text", replacement)
+        .on_input(Message::FindReplaceReplacementChanged)
+        .padding([6, 8])
+        .size(13);
+
+    let enabled = !search.trim().is_empty();
+    let action = |label: &'static str, message: Message| {
+        let button = button(text(label).size(12)).padding([6, 12]);
+        if enabled {
+            button.on_press(message)
+        } else {
+            button
+        }
+    };
+
+    column![
+        row![
+            text("Find:").size(12).width(90),
+            find_input.width(Fill),
+        ]
+        .spacing(8)
+        .align_y(iced::Center),
+        row![
+            text("Replace with:").size(12).width(90),
+            replacement_input.width(Fill),
+        ]
+        .spacing(8)
+        .align_y(iced::Center),
+        text("Searches Text, MText, Attribute Definitions, and block attribute values.")
+            .size(11),
+        text(status).size(11),
+        row![
+            Space::new().width(Fill),
+            button(text("Close").size(12))
+                .on_press(Message::CloseModal)
+                .padding([6, 12])
+                .style(button::secondary),
+            action("Replace", Message::FindReplaceOne).style(button::secondary),
+            action("Replace All", Message::FindReplaceAll).style(button::danger),
+            action("Find Next", Message::FindReplaceNext).style(button::primary),
+        ]
+        .spacing(8)
+        .align_y(iced::Center),
+    ]
+    .spacing(10)
+    .padding(12)
+    .width(Fill)
+    .into()
+}