Show rail scanner in first person spectator

[nickalreadyinuse]

#142

[Copilot]

Pull request overview

Implements rail gun scanner rendering/overlay support in first-person spectate by synchronizing scanner state over the network and redirecting scanner texture rendering + HUD behavior to the spectated player.

Changes:

• Add rf::weapon_has_scanner(...) helper for identifying scanner-capable weapons.
• Hook railgun scanner rendering paths to render the correct viewpoint/bitmap during spectate, and adjust HUD/scoping overlay behavior.
• Sync scanner state via entity state flags so spectators can see the scanner state remotely.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
game_patch/rf/weapon.h	Exposes weapon_has_scanner for scanner weapon detection.
game_patch/misc/player_fpgun.cpp	Redirects rail scanner rendering for spectate and changes render target behavior for the scanner bitmap.
game_patch/hud/multi_spectate.cpp	Adds scanner state replication + early frame sync and HUD/scope overlay handling while scanning in spectate.
docs/CHANGELOG.md	Notes the new “Sync rail scanner in first person spectate” change.

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