Refine room input bar quick actions and emoji picker UX

[tyreseluo]

Summary

This PR improves the room input bar interaction flow by making quick actions clearer and less intrusive, while adding a lightweight emoji insertion flow.

Changes

• Move location entry trigger into an expandable quick-action card above the input row.
• Keep the more button always visible on the right side.
• Expand/collapse the location action card via the more button.
• Show the send button only when message input has content.
• Update more button styling to use theme primary colors.
• Add an emoji button on the left side of the input row.
• Add a preset emoji picker popup.
• Insert selected emoji directly into the input field for immediate preview.
• Keep input focus after emoji insertion and refresh typing/send-button state accordingly.
• Remove emoji picker container card background (buttons-only presentation).

UX Result

• Cleaner default composer UI.
• Primary message input remains visually dominant.
• Optional actions are still easy to access.
• Emoji insertion is fast and visible before send.