fix: update BattleGrid rand migration

[saagpatel]

What

• Updates the workspace rand dependency from 0.8.5 to 0.9.2.
• Replaces deprecated rand 0.8 APIs with rand 0.9 names across map generation, simulation tests, room codes, and map seed generation.
• Refreshes Cargo.lock to remove the old rand 0.8 line.

Why

• Clears the stale/conflicted Dependabot rand migration path with a current-main branch.
• Keeps the Rust dependency queue moving after the cargo minor-and-patch and tokio-tungstenite updates landed.

How

• Uses random, random_range, and rng in place of the deprecated gen, gen_range, and thread_rng APIs.
• Lockfile rationale: Cargo.lock changed only because the workspace rand pin moved to 0.9.2 and the old rand 0.8 transitive entries were removed.

Testing

• CARGO_TARGET_DIR=/tmp/battlegrid-rand-target ./scripts/cargo-safe.sh fmt --check
• CARGO_TARGET_DIR=/tmp/battlegrid-rand-target ./scripts/cargo-safe.sh clippy --workspace -- -D warnings
• CARGO_TARGET_DIR=/tmp/battlegrid-rand-target ./scripts/cargo-safe.sh test --workspace
• ./scripts/client-safe.sh tsc -b
• ./scripts/client-safe.sh eslint .
• ./scripts/client-safe.sh vitest run
• ./scripts/client-safe.sh vite build
• ./scripts/client-safe.sh playwright test --config=playwright.config.ts did not run locally because this Homebrew Rust install is missing the wasm32-unknown-unknown target required by the Playwright web server build.

Performance Impact

• None expected; this is an API-compatible RNG dependency update with the same call sites.

Risk / Notes

• Replaces stale Dependabot PR build(deps): bump rand from 0.8.5 to 0.9.2 #11.
• Local clone has a macOS-only PR-template case-collision artifact; it is not part of this PR.

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 28f3adea01

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[chatgpt-codex-connector]

Enable wasm RNG support for rand 0.9

When building the browser/WASM package, this version bump makes battleground-core pull rand_core 0.9 and getrandom 0.3, but crates/battleground-wasm only enables the old getrandom 0.2 js feature. The Docker build runs wasm-pack build crates/battleground-wasm --target web, and getrandom 0.3 does not support wasm32-unknown-unknown by default without its wasm_js backend/feature, so the WASM/client build regresses even though native Rust checks can still pass.

Useful? React with 👍 / 👎.