feat(system-builder): call a rest from the GAME tab (4f5)

[over2take]

Approved mockup docs/mockups/builder-rests.html (2026-10-09), stage 3. Under a custom game, TTRPG_SYSTEM gains a RESTS panel for the GM and granted editors (a built-in game's rests stay its own buttons, and its panel never asks).

• components/GameRestsPanel.tsx: one of the game's rests; who rests (every player character, the NPCs on the map being viewed too, or ticked by hand, starting with the players); what each will get (dice still to roll shown as such, conditions wearing off); CALL, with a count, then previewed again. Everyone the panel could choose is previewed once, so ticking asks the server nothing more. An answer that isn't a list of rests shows no panel rather than crashing.
• sheets/restCalls.ts: the requests, the NPC tokens on the map being viewed (a battle map's floor shown, or the city, as the map's own controls decide), who is chosen, what the server is asked for, and how a change reads.
• AdminPanel passes each panel's map NPCs into TTRPG_SYSTEM.

Summary

Test plan

• Tested locally
• Tests pass

Pre-merge checklist

Code quality:

• Code follows project style
• No breaking changes (or clearly documented)
• No console errors or warnings

Version & Release:

• Version bumped? If releasing to users, update:
  • frontend/package.json version
  • docker-compose.yml APP_VERSION
  • CHANGELOG.md with release notes
• GitHub Actions will auto-tag Docker images with the new version

Before merging to main:

• All tests passing
• PR reviewed and approved
• Branch is up to date with main
• No merge conflicts

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