fix(ui): render digit-led single-$ math — move currency guard to close side

[aarontrowbridge]

Closes #375.

What

The single-$ inline-math rule rejected any math whose opening $ was immediately followed by a digit (an anti-currency guard on the wrong side). All digit-led inline math — the most common physics reporting shape, e.g. .53\times10^{-5}$ — fell through to markdown and rendered raw, while $\alpha$ rendered fine, which made the failure look random.

Fix

Move the digit guard from the open side of the delimiter to the close side — Pandoc's actual currency rule ("the closing $ must not be followed by a digit"):

• singleDollarTokenizerRegex and singleDollarInlineRegex drop \d from the open-side lookahead and add it to the close side
• comment block updated to document the close-side rule

-and- pairs stay literal because the first closing $ abuts a digit; and, env-var dollars, escaped \$, halves of `400591…$$, and code spans are all unaffected (test-covered).

Testing

• bun test src/context/marked-math.test.ts from packages/ui — 10 pass (2 new tests: digit-led positives incl. the two reported snippets, tight digit-pair currency negative)
• bun typecheck from packages/ui — clean; full bun typecheck at repo root — 30/30 green

Also includes: unblocking fix for the base branch

The base (local/amicode @ 4cf9ef2) typechecks red — #374 indexes the runtime-injected Idempotency-Key/X-Session-Id headers on the static per-provider header union, so its own test file fails tsgo and the pre-push/typecheck gate is blocked. Commit b2143c4 widens the lookup through a Record in that test file only — no production code touched. @jack-champagne FYI, happy to split it into its own PR if you'd rather.

Follow-up (after merge)

Re-extract the app-bundle overlay at the new fork tag so drift_gate.mjs stays green (separate PR in harmoniqs/amicode), then scripts/rebuild_amicode_locally.sh.

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