Split inventory into bags-only (B key) and character screen (C key). Vendor window
auto-opens bags with sell prices on hover and right-click to sell. Add camera intro
pan on all login/spawn/teleport/hearthstone events and idle orbit after 2 minutes.
Add quest log UI, SMSG_MONSTER_MOVE handling, deferred creature spawn queue, and
creature fade-in/movement interpolation for online mode.
Render the world into an off-screen MSAA RGBA16F framebuffer, resolve
to a regular texture, then blit to screen via a fullscreen quad shader.
This sets up the infrastructure for future HDR tonemapping and SSAO
(depth texture preserved for sampling). Currently a passthrough until
HDR light sources are added. Login screen bypasses the FBO and renders
directly to the default framebuffer.
