fix(1.0.5): revert Sec-CH-UA spoof (white pages), add DevTools shortcut

- Sec-CH-UA / Sec-CH-UA-Mobile / Sec-CH-UA-Platform header overrides on
  every request in 1.0.4 broke page rendering (all views white). Reverted
  to image-Referer-only behavior from 1.0.3. The Google "embedded browser"
  fix in 1.0.4 came primarily from the adblock whitelist (which IS kept)
  — Sec-CH-UA spoofing was the suspect for the regression.
- Ctrl+Shift+I and F12 now open DevTools on the main shell and on every
  in-app browser view. Always-on so kiosk machines can be debugged
  without leaving kiosk mode.
- Restore session sequenced (await 150ms between tabs) to avoid concurrent
  create-view races where multiple setLoader/addChild interleaved.
- Update banner now shows error state with a "Повторить" button instead
  of hiding it, so install-update failures are visible to the user.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "ESH-Media",
-  "version": "1.0.4",
+  "version": "1.0.5",
   "private": true,
   "main": "main.js",
   "scripts": {