Fix/daemon failure toast

[Annieeeee11]

Summary

• Relocate DaemonFailureBanner out of <main> so it overlays the shell instead of consuming layout height.
• Restyle it as a fixed top-right panel using import-modal surface/border/text tokens (rounded panel + shadow).
• Keep show/copy details behavior; details expand below the toast body.

Test plan

• Force a daemon failure (e.g. bad daemon binary / exit) and confirm the toast appears top-right without shifting the board/import layout.
• Confirm title, message, status code chip, Show/Hide details, and Copy details still work.
• Confirm the toast stays visible over sidebar + main content and doesn’t block critical chrome unduly.
• Spot-check light/dark if import-modal tokens differ by theme.

Before

After

[codebanditssss]

correct and clean. moving the banner out of <main> to a fixed-position sibling makes it overlay instead of consuming layout height, which is the shift-the-board bug this fixes. the content restructure is logically equivalent, details still expand on toggle and role="alert" + buttons + code chip are preserved, and the existing DaemonFailureBanner.test.tsx (not in the diff) asserts on behavior rather than layout classes so it stays green and still covers the component.

verified a few things:

• --space-6 is defined (24px), so the new @utility w-daemon-failure-toast calc(100vw - var(--space-6)) clamp is valid, and it mirrors the existing w-dialog-* pattern.
• new tokens follow convention; the details max-h token (10rem) equals the old max-h-40.
• z-overlay is the standard overlay layer.

nits (non-blocking):

• reusing import-modal tokens (--color-bg-import-modal, --color-text-import-title, etc.) for a daemon toast couples it to the import modal's theme. visually consistent, but semantically it borrows another component's tokens.
• wrap-break-word is new here; the rest of the codebase uses break-words (both valid v4, same effect) so minor inconsistency.
• top-right placement could overlap the topbar controls (bell / Kill / Orchestrator). your own test plan flags this, worth a glance at the after-screenshots, though those controls are effectively dead while the daemon is down.
• pointer-events-auto is redundant with no pointer-events-none parent, harmless.

approving.