Both findings from the v2.5.0 milestone-merge review (#2215).
1. `progressToastId` collided across distinct progress streams.
`ProgressToken` is `string | number`, so `String(token)` mapped the
numeric token 7 and the string token "7" onto one id — and because
notifications keyed by the same id are *replaced* rather than
stacked, two concurrent streams overwrote each other's toast. The
absent case was worse: it hardcoded the sentinel "default", which a
server is free to send as a genuine string token. The id now carries
the token's type (`progress-n:7` / `progress-s:7`) and gives the
no-token case a prefix of its own (`progress-none`) that no token
value can produce.
2. `newAttemptId`'s fallback now prefers `crypto.getRandomValues`.
`randomUUID` needs a secure context; `getRandomValues` does not and
exists in every browser that has `crypto` at all — so the exact
situation the fallback exists for (a `file://` page, a plain-HTTP
non-loopback host) still has a CSPRNG on hand. `Math.random` stays
as the last resort for a `crypto`-less global, and the "never a
security token" comment stays too. Retires CodeQL alert 72
(`js/insecure-randomness`) honestly rather than by dismissing it.
Tests: collision cases for 7 vs "7" and the absent token vs "default" /
"none", a distinctness sweep over the whole id space; and the attempt-id
fallback test split into a getRandomValues arm (asserting the CSPRNG is
used and `Math.random` is not) and a no-crypto-at-all arm.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Uw1s4LRBUzrFwLzPT4mAJn
Signed-off-by: cliffhall <cliff@futurescale.com>
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