Fix Chat Tools dark-mode floating trigger

[smshagor-dev]

Summary

Fixes the bottom-right Chat Tools floating trigger so its icon and button remain readable and visually consistent in dark mode without changing shared button styles or chat behavior.

Changes

• Add a narrowly scoped Chat Tools trigger theme override.
• Force the command icon to inherit a high-contrast foreground color.
• Add explicit dark-mode background, border, hover, active and focus-visible states.
• Respect mobile safe-area insets for bottom/right positioning.
• Respect reduced-motion preferences.
• Load the override once from the client entrypoint.

Scope

No chat APIs, Redux state, keyboard shortcut behavior, modal behavior, message sending, E2EE, uploads or backend code are changed.

Validation target

Frontend build/lint through the repository CI. Vercel preview may remain unavailable while the account-level daily deployment limit is exhausted.

[vercel]

Deployment failed for project syncchat with the following error:

Resource is limited - try again in 24 hours (more than 100, code: "api-deployments-free-per-day").

Learn More: https://vercel.com/smshagor-devs-projects?upgradeToPro=build-rate-limit

[vercel]

Deployment failed for project syncchat-api with the following error:

Resource is limited - try again in 24 hours (more than 100, code: "api-deployments-free-per-day").

Learn More: https://vercel.com/smshagor-devs-projects?upgradeToPro=build-rate-limit