fix: allow Find in Files hotkey to work after closing a script tab

[willeastcott]

Summary

• When a script tab is closed, the code panel is hidden with visibility: hidden but Monaco's internal <textarea> retains DOM focus
• The global hotkey system in hotkey.ts ignores keydown events targeting <textarea> elements without the hotkeys class, so Ctrl+Shift+F is silently dropped
• Blur the active element inside the code panel when toggleCode(false) is called, so the global hotkey handler can receive keyboard events
• Add a null model guard in picker:search:open to prevent errors when no document is open

Fixes #1730

Test Plan

• Open Code Editor with no code tabs open
• Press Ctrl+Shift+F -- verify Find in Files tab opens
• Close Find in Files tab
• Open a script file
• Close the script tab
• Press Ctrl+Shift+F -- verify Find in Files tab opens again
• Open a script, select some text, press Ctrl+Shift+F -- verify selection is used as search value

[Copilot]

Pull request overview

Fixes the “Find in Files” global hotkey (Ctrl+Shift+F) becoming unresponsive after closing the last script tab by ensuring Monaco’s hidden textarea doesn’t retain focus, and hardens search picker behavior when no document/model is open.

Changes:

• Blur the currently focused element inside the code panel when the code panel is hidden (toggleCode(false)), so global hotkeys are not ignored due to textarea targeting.
• Add a guard around monacoEditor.getModel() before deriving a search value from the current selection.
• (As part of the above) avoid errors when opening search with no active document.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/code-editor/pickers/picker-search.ts	Adds model guard before using selection text as the default search value.
src/code-editor/monaco/monaco.ts	Blurs focused element when hiding the code panel to restore global hotkey handling.

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