sdks/typescript: replace datetime / untyped duration types with Temporal

[Copilot]

• Rebase on latest main branch with refactored TypeScript SDK structure
• Adapt Temporal types to work with new sqlite-connection.ts module (replaces sqlite.ts)
• Update sqlite-types.ts to support Temporal.Instant in SQLiteBindValue
• Update sqlite-connection.ts to encode/decode Temporal types
• Export Temporal types and helpers from main index
• Update test setup to support both Date and Instant inputs
• Update test assertions to use epochMilliseconds property
• All 98 tests pass

Changes from main branch:

• sqlite.ts → sqlite-connection.ts (new file structure)
• absurd-types.ts → removed (moved to absurd.ts)
• New absurd.ts with full implementation

Temporal API additions:

• temporal-types.ts module with Instant, Duration types and conversion helpers
• datetime columns now return Temporal.Instant instead of Date
• Helper functions: instantFromDate, instantToDate, durationFromSeconds, etc.

Original prompt

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This section details on the original issue you should resolve

<issue_title>sdks/typescript: replace datetime / untyped duration types with Temporal</issue_title>
<issue_description>Refs:

• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Temporal#browser_compatibility
• Temporal support (TC39 stage 3 proposal) oven-sh/bun#15853
• https://github.com/fullcalendar/temporal-polyfill</issue_description>

<agent_instructions>Please start with identifying usages first, then go minimal design & implementation; provide tests for the changes.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes sdks/typescript: replace datetime / untyped duration types with Temporal #22

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[bcho]

@copilot rebase the latest main branch and rework the change

[Copilot]

@copilot rebase the latest main branch and rework the change

Rebased on main and reworked the changes to work with the refactored TypeScript SDK structure. The new sqlite-connection.ts now decodes datetime columns to Temporal.Instant and the exports have been updated. All 98 tests pass. (d0c3692)