feat(vscode): sync IDE context into the TUI

[ravshansbox]

Issue for this PR

Closes #3096
Closes #3472

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

This adds an IDE-context sync path between the VS Code extension and the TUI. The extension now sends the active file plus open inactive files, keeps them synced by default, and the TUI shows the active file with a compact inactive-file count above the prompt.

It also restores the filepath insert command and renames the VS Code setting from includeOpenFiles to includeInactiveFiles, which matches the actual behavior better.

How did you verify your code works?

• built packages/opencode
• ran bun run compile in sdks/vscode
• tested the VS Code flow locally: opening opencode sends the active file and inactive open files, switching focus no longer drops the active file, and the prompt bar renders the IDE context safely

Screenshots / recordings

Not included.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

Hey! Your PR title vscode: sync IDE context into the TUI doesn't follow conventional commit format.

Please update it to start with one of:

• feat: or feat(scope): new feature
• fix: or fix(scope): bug fix
• docs: or docs(scope): documentation changes
• chore: or chore(scope): maintenance tasks
• refactor: or refactor(scope): code refactoring
• test: or test(scope): adding or updating tests

Where scope is the package name (e.g., app, desktop, opencode).

See CONTRIBUTING.md for details.

[github-actions]

Thanks for updating your PR! It now meets our contributing guidelines. 👍

[ravshansbox]

hi, @rekram1-node @fwang can you guys take a look as you will have time please?

[RespectMathias]

Wouldn't this be better as a plugin? Considering this feature is for a single IDE and could break based on vscode changes. This might be good if there was a standard, but I can't see why it should be added directly to OpenCode if there isn't.

Just my opinion tho, SRP and all that.