feat(dashboard): add quick hide action for platform cards

[manhbi18112005]

Summary

This PR adds a quick hide control to dashboard platform cards. Users can now hide a platform card directly from the card header without opening platform layout settings.

What changed

• Added an icon-only hide button in each platform card header
• Hooked hide action into existing dashboard/platform layout visibility state
• Added compact header icon button styling for consistent layout

Behavior

• Clicking the hide icon immediately removes that platform card from the current dashboard view
• Existing card actions (refresh, switch, collapse where applicable) continue to work as before

Validation

• Type check passes successfully
• No new compile errors introduced in dashboard page/styles

[Copilot]

Pull request overview

Adds a quick “hide” control to each dashboard platform card so users can remove a card from the current view directly from the card header (reusing the existing platform layout visibility state).

Changes:

• Added an icon-only hide button to platform card headers and wired it to usePlatformLayoutStore visibility (setHiddenEntry).
• Updated card header markup to group header actions consistently via a header-action-group wrapper.
• Added compact icon-button sizing styles for header actions (.header-icon-btn).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/pages/DashboardPage.tsx	Adds hide-button rendering and handler, and updates card header action layout to include the new control.
src/pages/DashboardPage.css	Introduces .header-icon-btn sizing to support the icon-only header hide button.

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