Add desktop integration files and window state persistence

outlay-gtk/data/icons/hicolor/scalable/apps/io.github.outlay.svg

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 128 128" width="128" height="128">
+  <defs>
+    <linearGradient id="bg" x1="0" y1="0" x2="0" y2="1">
+      <stop offset="0%" stop-color="#3584e4"/>
+      <stop offset="100%" stop-color="#1a73e8"/>
+    </linearGradient>
+  </defs>
+  <!-- Background circle -->
+  <circle cx="64" cy="64" r="60" fill="url(#bg)"/>
+  <!-- Wallet body -->
+  <rect x="24" y="38" width="72" height="52" rx="8" fill="#ffffff" opacity="0.95"/>
+  <!-- Wallet flap -->
+  <path d="M24 50 Q24 38 36 38 L88 38 Q96 38 96 46 L96 50 Z" fill="#e8e8e8"/>
+  <!-- Coin circle -->
+  <circle cx="82" cy="64" r="14" fill="#f5c211" stroke="#e0a800" stroke-width="2"/>
+  <!-- Dollar sign on coin -->
+  <text x="82" y="70" font-family="sans-serif" font-size="18" font-weight="bold" fill="#8b6914" text-anchor="middle">$</text>
+  <!-- Arrow out (expense indicator) -->
+  <path d="M40 64 L54 54 L54 58 L66 58 L66 70 L54 70 L54 74 Z" fill="#2ec27e" opacity="0.9"/>
+</svg>

outlay-gtk/data/io.github.outlay.desktop

@@ -0,0 +1,9 @@
+[Desktop Entry]
+Name=Outlay
+Comment=Personal income and expense logger
+Exec=outlay-gtk
+Icon=io.github.outlay
+Terminal=false
+Type=Application
+Categories=Office;Finance;
+Keywords=expense;budget;money;finance;income;

outlay-gtk/data/io.github.outlay.gschema.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<schemalist>
+  <schema id="io.github.outlay" path="/io/github/outlay/">
+    <key name="window-width" type="i">
+      <default>900</default>
+    </key>
+    <key name="window-height" type="i">
+      <default>600</default>
+    </key>
+    <key name="window-maximized" type="b">
+      <default>false</default>
+    </key>
+  </schema>
+</schemalist>

outlay-gtk/src/window.rs

@@ -1,4 +1,5 @@
 use adw::prelude::*;
+use gtk::glib;
 use outlay_core::db::Database;
 use std::rc::Rc;
 
@@ -120,14 +121,52 @@ impl MainWindow {
         split_view.set_sidebar(Some(&sidebar_page));
         split_view.set_content(Some(&content_page));
 
+        // Restore window size from settings
+        let saved_width: i32 = db
+            .get_setting("window_width")
+            .ok()
+            .flatten()
+            .and_then(|s| s.parse().ok())
+            .unwrap_or(900);
+        let saved_height: i32 = db
+            .get_setting("window_height")
+            .ok()
+            .flatten()
+            .and_then(|s| s.parse().ok())
+            .unwrap_or(600);
+        let saved_maximized: bool = db
+            .get_setting("window_maximized")
+            .ok()
+            .flatten()
+            .map(|s| s == "true")
+            .unwrap_or(false);
+
         let window = adw::ApplicationWindow::builder()
             .application(app)
             .title("Outlay")
-            .default_width(900)
+            .default_width(saved_width)
-            .default_height(600)
+            .default_height(saved_height)
             .content(&split_view)
             .build();
 
+        if saved_maximized {
+            window.maximize();
+        }
+
+        // Save window size on close
+        {
+            let db_ref = db.clone();
+            window.connect_close_request(move |win| {
+                let (width, height) = win.default_size();
+                db_ref.set_setting("window_width", &width.to_string()).ok();
+                db_ref.set_setting("window_height", &height.to_string()).ok();
+                db_ref
+                    .set_setting("window_maximized", if win.is_maximized() { "true" } else { "false" })
+                    .ok();
+                glib::Propagation::Proceed
+            });
+        }
+
         MainWindow {
             window,
             split_view,