Proposal: transparent UI theme (blurred hero backdrop) as an optional theme

AI disclosure (per AI-POLICY.md): I used AI assistance while writing parts of this code. I reviewed every change myself, tested it on my phone, I understand what each change does, and I can explain and fix any of it. I am disclosing this upfront because the policy asks for it.

What it is

In my fork (codeiva11/StreamCloud) I built a transparent look for the app: solid dark surfaces become transparent so the blurred hero poster shows through across Home, Settings, search and the result screen. The nav bar is 70% black transparent, the search bar and filter chips are fully transparent, the result screen top bar sits as an overlay on the poster with transparent Play/Download buttons, and the genre chips are transparent (checked state still blue).

What it changes (fork commits, on top of upstream master)

Blurred hero backdrop on Home, extended to bottom nav and main screens (106c8434, 17441c31, 7a466e96)
Nav bar 70% black transparent (cc5f59ad)
Settings screens, search bar, provider chips fully transparent (be3ef757, 26f9c1d8, 3f0543d8, c83b5209, ac3a6de9)
Result screen background transparent; top bar overlay; Play/Download transparent (7fb7bbf2, f07f9bd2)
Genre chips truly transparent (0cab3a69 — Material3 ChipDrawable paints an opaque chipSurfaceColor under chipBackgroundColor, so the style now sets chipSurfaceColor to transparent)

Testing

Tested on my phone with the fork's pre-release builds. I can attach phone screenshots if helpful. The default theme is unchanged — this would be offered as an option, not a replacement for the current default.

Question for maintainers

Would you be interested in this as an optional theme in upstream CloudStream? If yes, I will clean the fork commits into a proper PR and review every line myself before submitting. If not, I will keep it as a fork-only feature — no problem.

Reference: codeiva11/StreamCloud, main branch.