fix(terminal): stop Cmd+K clear from opening the command menu

[posthog]

Problem

Pressing Cmd+K to clear the terminal also popped the command menu open on top, every time. Two independent mod+k handlers fired on a single keypress: the terminal's xterm handler cleared the terminal but only called preventDefault(), so the native keydown kept bubbling up to the document-level mod+k hotkey, which toggled the command palette open. The global binding had no terminal-focus guard.

Changes

Add stopPropagation() / stopImmediatePropagation() to the k + cmdOrCtrl branch of the terminal's custom key handler, so a terminal clear no longer reaches the global command-menu hotkey. The w, r, and 1-9 branches intentionally return false so their events do bubble to global handlers (close tab, reload, switch tabs), so they're deliberately left untouched.

How did you test this?

Added unit tests to TerminalManager.test.ts covering the key handler: Ctrl+K clears the terminal and calls preventDefault/stopPropagation/stopImmediatePropagation, while Ctrl+W keeps bubbling. Ran the suite — all 6 tests pass (pnpm --filter @posthog/ui test src/features/terminal/TerminalManager.test.ts). Biome lint clean on the changed files.

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[github-actions]

React Doctor found no issues in the changed files. 🎉

_{Reviewed by React Doctor for commit e380a2d.}