🎨 Palette: Add accessibility attributes to layout buttons

[billlzzz10]

💡 What:

• Added type="button" and aria-label={t("markAllRead")} to the "Mark all as read" button in notification-bell.tsx.
• Added type="button" and aria-label={tCommon("copy")} to the copy CLI command button in cli-command.tsx.
• Added aria-hidden="true" to the decorative Terminal icon in cli-command.tsx.

🎯 Why:
Buttons without explicit types can sometimes trigger unwanted form submissions if nested within a form context. Additionally, icon-only buttons or interactive elements require clear aria-labels for screen reader users to understand their purpose, while decorative icons should be explicitly hidden from screen readers.

📸 Before/After:
N/A - Purely structural/accessibility changes.

♿ Accessibility:

• Screen readers will now correctly announce "Mark all as read" and "Copy".
• Decorative icons are properly hidden from assistive technologies.

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PR created automatically by Jules for task 13508517515729678888 started by @billlzzz10

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Summary by cubic

Set type="button" on layout buttons and added aria-labels to improve screen reader support and prevent accidental form submissions. Applies to the notification bell’s “Mark all as read” and the CLI copy button; the decorative Terminal icon is aria-hidden.

^{Written for commit 991fd8b. Summary will update on new commits.}

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