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

[aarontrowbridge]

Closes #1725.

What

Port of harmoniqs/opencode#376 (the fix for harmoniqs/opencode#375): chat LaTeX like .53\times10^{-5}$ rendered raw because the single-$ inline-math rule rejected any math whose opening $ is followed by a digit.

Note on the issue's original framing: #1725 was drafted as an overlay re-extract at v1.18.10-amicode.23 — but the overlay doctrine changed since the fork absorption (#1091): the overlay is now the source of truth, maintained directly (fork archived, drift gate checks overlay↔manifest, not fork bytes). So this PR edits the overlay directly rather than re-extracting. The issue title predates that realization.

Changes

• overlay/packages/ui/src/context/marked-parser.tsx — digit guard moved 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). -and- stays literal; .53\times10^{-5}$ renders.
• overlay/packages/ui/src/context/marked-math.test.ts — 2 new tests: digit-led positives (the two reported snippets) + tight digit-pair currency negative; plus renderMathInText coverage.
• manifest.json — auto-refreshed by materialize (851 files at exact hashes).

Verification

• drift_gate.mjs — PASS (overlay and manifest in sync)
• Materialized tree (upstream base + overlay): bun test src/context/marked-math.test.ts from packages/ui — 10 pass / 0 fail, through the real createMarkdownParser pipeline

After merge

scripts/rebuild_amicode_locally.sh + window reload; verify ($3.53\times10^{-5}$ — nice determinism check for free) renders in chat.

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