fix: Add load recent sessions button in Agent sessions

[harshil-2096]

Summary

Closes #

Changes

How was this tested?

Checklist

• I have read the contributing guidelines
• pnpm build, pnpm test, pnpm typecheck, pnpm lint:ci, and pnpm format:check pass locally
• Tests added/updated where it makes sense
• No hand-edits to generated code (packages/trueforge-sdk, python/trueforge_sdk, .github/fern/openapi/openapi.json, docs/openapi.json) — fork PRs omit SDK regen; maintainers regenerate after merge
• Docs / .env.example updated if configuration or behavior changed

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Note

Low Risk
UI-only session list filtering and URL share state; no API or auth changes.

Overview
Adds a Load recent sessions control on the Agent Sessions page when the list is filtered to a narrow, timestamp-pinned window (typical after opening or deep-linking a session), so users can return to the normal last 30 days list instead of staying stuck on an empty sidebar.

SessionsPage detects that pinned range (no rolling s_tw, span ≤ twice the session buffer) and passes onLoadRecentSessions, which resets filters to defaultSessionTimeRange(), clears sessionId, and updates share URL params. AgentSessions renders the button above the list and skips the full-page empty state while that callback is present, so the action stays available even when the pinned range returns no rows.

Unit tests cover empty pinned ranges, clearing selection/URL on load, and that the button stays visible while switching sessions within the narrow window.

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🦋 Changeset detected

Latest commit: b543ef1

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@truefoundry/trueforge-ui	Patch

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