feat(window): persist main window size/position across launches (#97)

* feat(window): persist main window size/position across launches

The main window always opened at a fixed 1400x900, forcing a manual
resize every session. Save the window geometry (normal bounds +
maximized flag) to the existing desktop prefs store on close, and
restore it in createWindow.

Saved bounds are validated by a pure sanitizer against the current
display layout before use, so stale state degrades safely instead of
producing an off-screen or absurd window:
- garbage/partial config -> 1400x900 centered defaults
- size clamped between the 800x600 window minimums and the largest
  display's workArea
- position kept only when the window overlaps a display by at least
  100x50 px (unplugged monitor / resolution change -> re-center);
  negative multi-monitor coordinates remain valid
- maximized sessions save getNormalBounds() and re-maximize on
  restore; fullscreen deliberately restores windowed

No new dependency; reuses get/setDesktopConfig (atomic write,
fail-soft) in soundfont-manager.ts. The store file is already in the
reset-app-settings delete-set, so a config reset also resets bounds.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Signed-off-by: gionnibgud <gionnibgud@gmail.com>

* fix(window): don't crash shutdown if bounds persistence write fails

The close listener called setDesktopConfig synchronously with no error
handling; a disk-full or permissions failure during the write would throw
unhandled inside the close handler, risking a shutdown crash. Wrap the
write in try/catch and log a warning instead. Flagged by CodeRabbit on PR #97.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Signed-off-by: gionnibgud <gionnibgud@gmail.com>

---------

Signed-off-by: gionnibgud <gionnibgud@gmail.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

src/main/main.ts

@@ -56,7 +56,7 @@ if (process.platform !== 'linux') {
 }
 // ──────────────────────────────────────────────────────────────────────────
 
-import { app, BrowserWindow, ipcMain, dialog, shell, session, crashReporter, powerSaveBlocker, systemPreferences } from 'electron';
+import { app, BrowserWindow, ipcMain, dialog, shell, session, crashReporter, powerSaveBlocker, systemPreferences, screen } from 'electron';
 import * as path from 'path';
 import * as fs from 'fs';
 import { execFileSync } from 'child_process';
@@ -125,6 +125,7 @@ import { initSoundfontManager, getDesktopConfig, setDesktopConfig } from './soun
 import * as updateManager from './update-manager';
 import type { UpdateChannel } from './update-manager';
 import { installAppMenu } from './app-menu';
+import { sanitizeWindowBounds, MIN_WIDTH, MIN_HEIGHT } from './window-bounds';
 
 // Linux: enable Chromium's PipeWire capturer feature so getUserMedia can see
 // audio devices on PipeWire-only distros (Fedora 36+, recent Ubuntu, Arch).
@@ -455,15 +456,43 @@ function isLocalServiceUrl(url: string, backendPort: number): boolean {
 }
 
 function createWindow(port: number): void {
+    // Restore the previous session's window geometry, validated against the
+    // current display layout so stale bounds (unplugged monitor, resolution
+    // change, hand-edited config) can't put the window off-screen. When x/y
+    // are absent Electron centers the window as before.
+    const restored = sanitizeWindowBounds(
+        getDesktopConfig().windowBounds,
+        screen.getAllDisplays().map((d) => d.workArea),
+    );
     mainWindow = new BrowserWindow({
-        width: 1400,
-        height: 900,
-        minWidth: 800,
-        minHeight: 600,
+        x: restored.x,
+        y: restored.y,
+        width: restored.width,
+        height: restored.height,
+        minWidth: MIN_WIDTH,
+        minHeight: MIN_HEIGHT,
         title: 'fee[dB]ack',
         backgroundColor: '#0f172a', // slate-900 to match Slopsmith UI
         webPreferences: rendererWebPreferences,
     });
+    if (restored.maximized) mainWindow.maximize();
+
+    // Persist geometry on close. getNormalBounds() so a maximized session
+    // saves the underlying windowed size, restored + re-maximized next launch.
+    // ponytail: fullscreen is deliberately not persisted (launching straight
+    // into fullscreen is jarring, especially on macOS) and we save on close
+    // only — a crash loses the last session's geometry; add debounced
+    // resize/move saving if that ever matters.
+    mainWindow.on('close', () => {
+        if (!mainWindow || mainWindow.isDestroyed()) return;
+        try {
+            setDesktopConfig({
+                windowBounds: { ...mainWindow.getNormalBounds(), maximized: mainWindow.isMaximized() },
+            });
+        } catch (err) {
+            console.warn('[main] Failed to persist window bounds on close:', err);
+        }
+    });
 
     // Forward renderer console to main process stdout
     mainWindow.webContents.on('console-message', (_event, level, message, line, sourceId) => {

src/main/soundfont-manager.ts

@@ -13,6 +13,7 @@ import * as https from 'https';
 import * as path from 'path';
 import * as crypto from 'crypto';
 import { restartPython } from './python';
+import type { SavedWindowBounds } from './window-bounds';
 
 // ── Source of truth for the high-quality soundfont ──────────────────────────
 // Public mirror of FluidR3_GM.sf2 on the feedback-soundfonts repo. When a new
@@ -34,6 +35,9 @@ interface DesktopConfig {
     // 127.0.0.1, so other devices on the network can reach the library / sync
     // room. Opt-in (default loopback) — see python.ts and issue #441.
     lanAccess?: boolean;
+    // Last main-window geometry, restored (after sanitization against the
+    // current display layout) on next launch — see window-bounds.ts.
+    windowBounds?: SavedWindowBounds;
 }
 
 function configPath(): string {

src/main/window-bounds.ts

@@ -0,0 +1,77 @@
+// Pure window-bounds sanitization for main-window persistence. No electron
+// imports so tests/window-bounds.test.js can load it headless via _load-ts.
+
+export interface SavedWindowBounds {
+    x: number;
+    y: number;
+    width: number;
+    height: number;
+    maximized?: boolean;
+}
+
+// A display's workArea (same shape as Electron's Rectangle).
+export interface DisplayRect {
+    x: number;
+    y: number;
+    width: number;
+    height: number;
+}
+
+export interface RestoredWindowBounds {
+    width: number;
+    height: number;
+    x?: number;
+    y?: number;
+    maximized: boolean;
+}
+
+// Keep in sync with createWindow() in main.ts.
+export const DEFAULT_WIDTH = 1400;
+export const DEFAULT_HEIGHT = 900;
+export const MIN_WIDTH = 800;
+export const MIN_HEIGHT = 600;
+
+// Minimum overlap with some display's workArea for the saved position to be
+// trusted — enough of the title bar to grab with the mouse.
+const MIN_VISIBLE_W = 100;
+const MIN_VISIBLE_H = 50;
+
+function isFiniteNumber(v: unknown): v is number {
+    return typeof v === 'number' && Number.isFinite(v);
+}
+
+// Validate saved bounds against the current display layout. Untrusted input
+// (hand-edited/corrupt config, unplugged monitor, resolution change) degrades
+// to defaults rather than producing an off-screen or absurd window. Omitted
+// x/y means "let Electron center the window".
+export function sanitizeWindowBounds(saved: unknown, displays: DisplayRect[]): RestoredWindowBounds {
+    const defaults: RestoredWindowBounds = { width: DEFAULT_WIDTH, height: DEFAULT_HEIGHT, maximized: false };
+    if (displays.length === 0) return defaults;
+
+    const b = saved as SavedWindowBounds | undefined;
+    if (!b || typeof b !== 'object') return defaults;
+    if (!isFiniteNumber(b.x) || !isFiniteNumber(b.y) || !isFiniteNumber(b.width) || !isFiniteNumber(b.height)) {
+        return defaults;
+    }
+    const maximized = b.maximized === true;
+
+    // Clamp size: never below the window minimums, never above the largest
+    // display's workArea (window bigger than any screen → shrink to fit).
+    const maxW = Math.max(...displays.map((d) => d.width));
+    const maxH = Math.max(...displays.map((d) => d.height));
+    const width = Math.min(Math.max(Math.round(b.width), MIN_WIDTH), maxW);
+    const height = Math.min(Math.max(Math.round(b.height), MIN_HEIGHT), maxH);
+
+    // Trust the position only if the window meaningfully overlaps some
+    // display. Negative coordinates are valid multi-monitor layouts — this is
+    // an intersection test, not a sign check.
+    const x = Math.round(b.x);
+    const y = Math.round(b.y);
+    const visible = displays.some((d) => {
+        const overlapW = Math.min(x + width, d.x + d.width) - Math.max(x, d.x);
+        const overlapH = Math.min(y + height, d.y + d.height) - Math.max(y, d.y);
+        return overlapW >= MIN_VISIBLE_W && overlapH >= MIN_VISIBLE_H;
+    });
+
+    return visible ? { x, y, width, height, maximized } : { width, height, maximized };
+}