[iamnbutler]

Settings, terminal, connection, and composer fixes from the Ace flow map: ^52 ^761 ^791 ^399 ^418 ^425 ^491 ^492 ^508 ^511.

• ^52 Settings → Providers hides Add/Replace key while an environment variable overrides the Keychain key.
• ^761 The terminal follows a live theme switch. It now reads tokens after ThemeProvider's layout effect has toggled dark.
• ^791 The deployed web app separates two cases. When the host answers HTTP but refuses the WebSocket, it says " refused this web app. On that host, run ace web <origin>, then reload." The Tailscale hint is kept for a host that can't be reached.
• ^399 A rename refusal clears as soon as you type.
• ^418 Archive inactive is in the Channels section's ⋯ menu.
• ^425 An empty Move to… item says "no available destinations" and explains what would let a channel move.
• ^491 ^492 Each format button has an aria-label, aria-keyshortcuts, and its shortcut in the tooltip (for example ⇧⌘S). The Show/Hide tools toggle is labelled "Formatting tools".
• ^508 The composer keeps at most MAX_IMAGES (4) images and says how many it dropped. MAX_IMAGES moved to @ace/channel/protocol so the app and room.ts share it.
• ^511 Voice input says why it stopped (microphone denied, no microphone, network, …). Silence still ends without a message.

Smoke-tested on an isolated host (ace serve --port 4431 --loopback) driven by headless Chromium:

• Tooltip shows "Strikethrough ⇧⌘S".
• Attaching six images keeps four and toasts "2 images weren't attached."
• Record without mic permission toasts the not-allowed reason.
• Providers shows no key button under OPENAI_API_KEY/ANTHROPIC_API_KEY overrides.
• A duplicate rename error clears on typing.
• The section menu lists Archive inactive, and running it reports "No inactive channels on this host".
• Move to… shows the new text.
• The terminal text flips dark/light with the system scheme.
• For the connection message, a VITE_ACE_WEB=1 build was pointed first at example.com, which shows "refused this web app", and then at an .invalid host, which shows "Can't reach … Tailscale".

Built in Ace

No. Built by Claude Code (fix-train worker) outside Ace. It ran headless Playwright for the smoke tests, which Ace has no tool for. See #5.