fix(editor): restore cursor state and prevent tab-switch flash

[bajrangCoder]

No description provided.

[greptile-apps]

Greptile Summary

This follow-up restores cursor, scroll, and fold state while preloading persisted tabs without allowing remote requests to block startup.

• Adds deduplicated EditorFile.load() calls and installs restored selections directly into the loaded document state.
• Waits for local tab preloads while allowing FTP, SFTP, HTTP, and HTTPS loads to continue asynchronously.
• Defers restored-fold consumption until loading has completed and preserves pending restoration state during session saves.
• Adds regression coverage for local preload ordering, non-blocking remote restoration, and pending cursor/fold persistence.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
src/lib/editorFile.js	Adds in-flight load reuse and installs the restored selection into the final document state before marking the file loaded.
src/lib/editorManager.js	Applies pending folds only after loading finishes and saves the resulting folded editor state.
src/lib/restoreFiles.js	Awaits local preloads but detaches remote loads so unavailable remote services cannot hold startup.
src/lib/saveState.js	Persists pending cursor, scroll, and fold values while an asynchronously restored file remains unloaded.
tests/unit/restoreFiles.test.js	Covers local preload completion and non-blocking restoration across supported remote URI schemes.
tests/unit/sessionPersistence.test.js	Covers persistence of pending folds and remote cursor and scroll state.

Sequence Diagram

sequenceDiagram
  participant Startup
  participant Restore as restoreFiles
  participant Local as Local tabs
  participant Remote as Remote tabs
  participant State as Session persistence
  Startup->>Restore: Restore persisted files
  Restore->>Local: Start preloads
  Restore->>Remote: Start preloads
  Note over Remote: Continue asynchronously
  Local-->>Restore: Local loads complete
  Restore-->>Startup: Restoration complete
  Startup->>State: Enable and save state
  Remote-->>State: Preserve pending view state until loaded

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_{Reviews (2): Last reviewed commit: "fix" | Re-trigger Greptile}

[lucasdsc012-hack]

Congratulations Raunak, it turned out great!

[chaiphet6669-afk]

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