Fix whisper dictation closing launcher when triggered from within SuperCmd (fixes #251)

[shobhit99]

Summary

• When Whisper dictation was triggered while the SuperCmd launcher was visible, the transcribed text was being routed to the previously frontmost external app via activateLastFrontmostApp() — switching focus away from SuperCmd and effectively closing it
• This affected the search bar, notes, canvas, and any other SuperCmd screen

Root cause

whisper-type-text-live IPC handler always called activateLastFrontmostApp() before typing, regardless of whether the launcher was open. When launched from within SuperCmd, this switched focus to a different app.

Fix

• In main.ts: if the launcher window is currently visible when whisper-type-text-live is called, send a whisper-insert-into-launcher event directly to the renderer instead of activating another app
• In preload.ts + electron.d.ts: expose onWhisperInsertIntoLauncher bridge
• In App.tsx: listen for whisper-insert-into-launcher and insert the transcribed text at the current cursor position using document.execCommand('insertText'), which works for the search bar, notes, canvas, and any focused contenteditable

Test plan

• Open SuperCmd, trigger Whisper dictation — launcher should stay open and text should appear in the search bar
• Open Notes in SuperCmd, trigger dictation — text should be inserted into the notes editor
• Open Canvas, trigger dictation — text should be inserted at cursor
• When SuperCmd is hidden and dictation is triggered via global hotkey, text should still go to the previously active external app (existing behavior unchanged)

Closes #251

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