feat(about): show build commit next to the app version

Settings > About now renders "<version> (<short-sha>)" with the full
SHA in the tooltip, so bug reports from test and nightly builds
identify the exact commit. The commit is injected at CI build time into
apps/web/src/environments/build-commit.ts (same placeholder pattern as
the TMDB key inject); PR builds use the real head SHA instead of the
ephemeral merge commit. Local/dev builds keep the plain version.

The semver version itself deliberately stays untouched: a "-sha"
suffix would flip electron-updater into prerelease mode and leak into
installer/artifact version fields.

Requested by WolfganP in #1202.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

apps/web/src/app/settings/settings.component.ts

@@ -33,6 +33,7 @@ import {
     selectIsEpgAvailable,
 } from '@iptvnator/m3u-state';
 import { take } from 'rxjs';
+import { BUILD_COMMIT } from '../../environments/build-commit';
 import { DataService, RuntimeCapabilitiesService } from '@iptvnator/services';
 import {
     EmbeddedMpvSupport,
@@ -200,6 +201,9 @@ export class SettingsComponent implements OnInit, OnDestroy {
     /** Current version of the app */
     version = '';
 
+    /** Git commit the app was built from (CI builds only) */
+    readonly buildCommit = BUILD_COMMIT;
+
     /** Update message to show */
     updateMessage = '';
     readonly appUpdateStatus = signal<ElectronBridgeAppUpdateStatus | null>(