fix: OTLP nanosecond timestamp overflow in webapp event repository

[Roshan931]

Fixes #3292

Root cause

Epoch milliseconds multiplied by 1e6 as a JS Number before BigInt conversion

Changes

• Route all four epoch-ms -> nanosecond conversions through the existing convertDateToNanoseconds() helper, which multiplies in BigInt space, and add a regression test asserting exact nanosecond values.

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Latest commit: 68f813d

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[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

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Run ID: c00d2543-d4a9-4ebc-a195-a8c207d1f2ce

📥 Commits

Reviewing files that changed from the base of the PR and between d044670 and 68f813d.

📒 Files selected for processing (4)

• apps/webapp/app/v3/eventRepository/common.server.ts
• apps/webapp/app/v3/eventRepository/index.server.ts
• apps/webapp/app/v3/runEngineHandlers.server.ts
• apps/webapp/test/eventRepositoryNanoseconds.test.ts

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Walkthrough

The change centralizes date-to-nanoseconds conversion in event timestamp, duration, and retry-scheduling paths. It replaces inline millisecond-to-nanosecond calculations with convertDateToNanoseconds. New tests verify exact BigInt conversion, controlled current-time conversion, duration calculation, and timer restoration.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[devin-ai-integration]

Devin Review found 1 potential issue.

[devin-ai-integration]

🟡 Object literal breaks formatter check

The EVENT_STORE_TYPES literal puts POSTGRES and CLICKHOUSE on one line with a double space. oxfmt reformats this, so the code-quality CI check fails on the diff.

Suggested change

	POSTGRES: "postgres", CLICKHOUSE: "clickhouse",
	POSTGRES: "postgres",
	CLICKHOUSE: "clickhouse",

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