Add history view with day-grouped transaction list

Month navigation with prev/next buttons, transactions grouped by date
with headers (Today/Yesterday/formatted date), category icons, amounts
color-coded green for income and red for expenses, and daily net totals.

outlay-gtk/src/window.rs

@@ -2,6 +2,7 @@ use adw::prelude::*;
 use outlay_core::db::Database;
 use std::rc::Rc;
 
+use crate::history_view::HistoryView;
 use crate::log_view::LogView;
 
 pub struct MainWindow {
@@ -31,16 +32,24 @@ impl MainWindow {
         let content_stack = gtk::Stack::new();
         content_stack.set_transition_type(gtk::StackTransitionType::Crossfade);
 
-        // Log view - real widget
-        let log_view = LogView::new(db);
+        // Log view
+        let log_view = LogView::new(db.clone());
         let log_scroll = gtk::ScrolledWindow::builder()
             .hscrollbar_policy(gtk::PolicyType::Never)
             .child(&log_view.container)
             .build();
         content_stack.add_named(&log_scroll, Some("log"));
 
+        // History view
+        let history_view = HistoryView::new(db.clone());
+        let history_scroll = gtk::ScrolledWindow::builder()
+            .hscrollbar_policy(gtk::PolicyType::Never)
+            .child(&history_view.container)
+            .build();
+        content_stack.add_named(&history_scroll, Some("history"));
+
         // Remaining pages are placeholders for now
-        for item in &SIDEBAR_ITEMS[1..] {
+        for item in &SIDEBAR_ITEMS[2..] {
             let page = adw::StatusPage::builder()
                 .title(item.label)
                 .icon_name(item.icon)