chore(code): disable terminal tabs for cloud run

[VojtechBartos]

Problem

Terminal doesn't work for cloud rins. The terminal tab and inline bash commands (! command) are local-only features that shouldn't be available for cloud runs. Currently the terminal tab renders but shows nothing useful, the "+" button lets users add more empty terminal tabs, and typing ! command is silently dropped instead of being sent as a normal prompt.

Changes

• Terminal tabs hidden for cloud runs — LeafNodeRenderer filters out terminal tabs before they reach useTabInjection, so no TabContentRenderer or shell process is ever created. The "+" add terminal button is also hidden. If the active tab was a terminal, it falls back to the first available tab.
• Inline bash mode disabled for cloud runs — MessageEditor uses a new useIsWorkspaceCloudRun hook to set capabilities.bashMode to false, which disables the ! prefix visual indicator (blue ring). The submit function now also checks enableBashMode before routing ! text to the bash handler, so ! text is submitted as a normal prompt instead of being silently dropped.
• New useIsWorkspaceCloudRun hook — Thin wrapper around useWorkspace that returns workspace?.mode === "cloud", used by both LeafNodeRenderer and MessageEditor to avoid prop drilling.

How did you test this?

• pnpm typecheck — all 9 packages pass
• pnpm lint — no new warnings
• pnpm --filter code test — 584/584 tests pass