Rewarded videos ads to test a skin (#3120)

## Description:

Added rewarded video ads for skin trials via Playwire's
manuallyCreateRewardUi API. Users can now click "Try me" to watch a
video ad and receive a temporary skin trial. Upon completion a temporary
flare is granted to the player so they have ~5 minutes to use the skin.

added getPlayerCosmeticsRefs and getPlayerCosmetics to Cosmetics.ts to
centralize cosmetic retrieval & validation.

<img width="801" height="534" alt="Screenshot 2026-02-10 at 7 58 14 PM"
src="https://github.com/user-attachments/assets/51cc378c-2feb-4692-8cf2-20ee54cea3b8"
/>

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

evan

resources/lang/en.json

@@ -868,13 +868,15 @@
     "show_only_owned": "My Skins",
     "all_owned": "All skins owned! Check back later for new items.",
     "not_logged_in": "Not logged in",
-    "blocked": {
-      "login": "You must be logged in to access this skin.",
-      "purchase": "Purchase this skin to unlock it."
-    },
     "pattern": {
       "default": "Default"
     },
+    "try_me": "Try me!",
+    "trial_remaining": "remaining",
+    "trial_granted": "Skin trial granted!",
+    "trial_cooldown": "Only one trial per 24 hours. Please try again later.",
+    "reward_countdown": "Reward in {seconds} seconds...",
+    "steam_wishlist_prompt": "Support OpenFront by adding it to your Steam wishlist",
     "select_skin": "Select Skin",
     "selected": "selected"
   },