v1.3.48-rc.1

What's Changed

• feat(diff-viewer): scroll to first change when opening a diff by @brennanb2025 in #1620
• fix(codex-usage): correct Codex model pricing table by @AmethystLiang in #1669
• feat(telemetry): track agent_hook_install_failed per agent by @brennanb2025 in #1668
• fix(claude-usage): correct Anthropic model pricing by @AmethystLiang in #1671
• feat(source-control): add Stage Files primary button by @AmethystLiang in #1670

Full Changelog: v1.3.47...v1.3.48-rc.1