feat(v3): add desktop-only "Start in fullscreen" system option

Adds a "Start in fullscreen" toggle to the Settings → System panel,
addressing the desktop request in feedBack-desktop#97: users want the
app to launch fullscreen without hitting the OS hotkey every time.

The block ships hidden and is gated exactly like the App-updates block:
setupWindowOptions() only unhides + wires it when the feedBack-desktop
bridge exposes window.feedBackDesktop.window.{getStartFullscreen,
setStartFullscreen}. Web/Docker builds have no such bridge, so the
section never appears there. Persistence lives desktop-side because
only the Electron main process can read the pref at window-creation
time — core just proxies through the bridge.

The desktop bridge + launch behaviour land in a follow-up
feedBack-desktop PR.

Signed-off-by: gionnibgud <gionnibgud@gmail.com>

static/app.js

@@ -218,6 +218,7 @@ import {
     setAvOffsetMs,
     setInstrumentPathway,
     setupAppUpdates,
+    setupWindowOptions,
     syncDefaultArrangementPin,
 } from './js/settings.js';
 import {

static/js/settings.js

@@ -100,6 +100,7 @@ export async function loadSettings() {
     // failed fetch below still leaves the desktop updater wired up.
     // setupAppUpdates() is idempotent via _appUpdatesWired.
     setupAppUpdates();
+    setupWindowOptions();
     const resp = await fetch('/api/settings');
     const data = await resp.json();
     // Null-guard the form fields: on the v3 tabbed settings page the markup is
@@ -167,6 +168,47 @@ export async function loadSettings() {
     hwcInitSettingsUI();
 }
 
+// ── Window options (desktop-only) ────────────────────────────────────────
+// Desktop-only window preferences (start-in-fullscreen, …). The whole block
+// stays hidden in the plain web / Docker app; unhide + wire only when the
+// feedBack-desktop bridge (window.feedBackDesktop.window) exposes the getter
+// and setter. Persistence lives desktop-side because only the Electron main
+// process can read the pref at window-creation time — core just proxies.
+export let _windowOptionsWired = false;
+
+export function setupWindowOptions() {
+    const block = document.getElementById('window-options-block');
+    if (!block) return;
+    const winApi = window.feedBackDesktop?.window;
+    // Per-method capability check: a partial/older bridge may expose `window`
+    // without this shape. Leave the block hidden rather than half-wiring it.
+    if (!winApi
+        || typeof winApi.getStartFullscreen !== 'function'
+        || typeof winApi.setStartFullscreen !== 'function') {
+        return;
+    }
+
+    block.classList.remove('hidden');
+
+    const cb = document.getElementById('setting-start-fullscreen');
+    if (!cb) return;
+
+    // Hydrate from the desktop-persisted value. The getter may be sync or
+    // async (IPC round-trip); Promise.resolve normalises both.
+    Promise.resolve(winApi.getStartFullscreen()).then(function (on) {
+        cb.checked = !!on;
+    }).catch(function () { /* leave unchecked on error */ });
+
+    // Guard only the listener against double-binding; unhide + re-hydrate
+    // stay idempotent so re-entering Settings refreshes the checkbox.
+    if (!_windowOptionsWired) {
+        _windowOptionsWired = true;
+        cb.addEventListener('change', function () {
+            try { winApi.setStartFullscreen(cb.checked); } catch (_) { /* best-effort */ }
+        });
+    }
+}
+
 export const APP_UPDATE_CHANNELS = ['stable', 'rc', 'beta', 'alpha'];
 
 export let _appUpdatesWired = false;

static/v3/index.html

@@ -753,6 +753,21 @@
                             <a href="https://github.com/got-feedback/feedback-desktop/releases" target="_blank" rel="noopener" class="text-accent hover:text-accent-light underline">download new versions from GitHub Releases</a>.
                         </p>
                     </div>
+                    <!-- Window options — desktop-only; setupWindowOptions() unhides. -->
+                    <div id="window-options-block" class="hidden">
+                        <div class="fb-srow">
+                            <div class="fb-srow-main">
+                                <div class="fb-srow-title">Start in fullscreen</div>
+                                <div class="fb-srow-desc">Launch the desktop app in fullscreen every time.</div>
+                            </div>
+                            <div class="fb-srow-control">
+                                <label class="fb-switch">
+                                    <input type="checkbox" id="setting-start-fullscreen">
+                                    <span class="fb-switch-track"></span>
+                                </label>
+                            </div>
+                        </div>
+                    </div>
                     <!-- Library folder path -->
                     <div class="fb-srow fb-srow-stack">
                         <div class="fb-srow-main">