v1.16.3 — TheNerdyBox branding parity for the .msi installer

Brings the .msi installer to branding parity with the .exe — the previous branding pass (v1.16.1) only touched the NSIS (.exe) installer, since .msi is a completely separate WiX toolchain under the hood.

• Branded .msi — real TheNerdyBox imagery in the banner and dialog panels, previously untouched/generic.
• Install path nested under TheNerdyBox in the .msi too — C:\Program Files\TheNerdyBox\Stream Composer Suite\, matching the .exe.

Investigated and deliberately not built: a "Clean Install vs Upgrade" choice dialog, requested as a follow-up. Turns out MSI's upgrade path is already fully native — MajorUpgrade replaces an old install atomically and safely with zero custom scripting needed. Building a manual choice dialog would just be UI for a decision the installer already makes correctly on its own. Recommending against adding this to either installer unless a real separate need comes up (e.g. a dedicated "reset install" troubleshooting tool, not a wizard step on every normal upgrade).

Built against the exact tauri-cli-v2.11.4 WiX template (same rigor as the NSIS work — pulled the real pinned-version source rather than guessed), with only install-path nesting changed in the template.