fix(client): skip window-state save while minimized

A minimized window reports placeholder coordinates (-32000 on Windows); the
move event fired by minimize was persisting them, so quitting while
minimized silently discarded the remembered position (the new off-screen
validation then falls back to centered). Skip the save while minimized so
the last real geometry survives.

Follow-up to #124.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LwtnpHAoSFr1ZibQgQkNQK

Client/tauri-client/src-tauri/capabilities/default.json

@@ -16,6 +16,7 @@
     "core:window:allow-set-size",
     "core:window:allow-maximize",
     "core:window:allow-is-maximized",
+    "core:window:allow-is-minimized",
     "core:window:allow-outer-position",
     "core:window:allow-outer-size",
     "core:window:allow-available-monitors",

Client/tauri-client/src/lib/window-state.ts

@@ -188,6 +188,17 @@ export async function initWindowState(): Promise<() => void> {
     saveTimer = setTimeout(() => {
       void (async () => {
         try {
+          // A minimized window reports placeholder coordinates (-32000 on
+          // Windows) — skip so the last real geometry survives a minimized
+          // exit. Checked separately so platforms without isMinimized still
+          // save normally.
+          let minimized = false;
+          try {
+            minimized = await win.isMinimized();
+          } catch {
+            // Treat as not minimized
+          }
+          if (minimized) return;
           const pos = await win.outerPosition();
           const size = await win.outerSize();
           const maximized = await win.isMaximized();

Client/tauri-client/tests/unit/window-state-restore.test.ts

@@ -39,6 +39,7 @@ vi.mock("@tauri-apps/api/window", () => ({
     outerPosition: vi.fn(),
     outerSize: vi.fn(),
     isMaximized: vi.fn().mockResolvedValue(false),
+    isMinimized: vi.fn().mockResolvedValue(false),
   }),
   availableMonitors: () =>
     h.monitorsError !== null ? Promise.reject(h.monitorsError) : Promise.resolve(h.monitors),