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Part of PAR-339 (https://app.taskl.ie/w/paradaux/issues/PAR-339); stack PR 4/5. Workspace subtasks are disabled, so linked through descriptions.
Add player-perspective buy/sell controls, unit/stack prices, useful ordering, stock and observation timestamps, and location copying. Exclude unavailable direction prices; do not claim observations guarantee availability.
Acceptance: implement behaviour, update relevant player documentation, verify populated/empty states and relevant desktop/mobile and permission boundaries. Record PR and validation here.
Implemented in PR #13, part 4/5 of the PAR-339 stack into develop. Final stack validation passes: 169 unit/integration tests with coverage thresholds, 124 Playwright tests, lint, production build/typecheck, and full Gradle build. Ready for review; merge in stack order. Not merged or deployed.