🎨 Palette: Add accessibility to password input toggle

[nkissick-del]

💡 What: Added aria-label to the password visibility toggle button in the Input component and cleaned up the login page.
🎯 Why: The password toggle button was accessible only via mouse clicks and lacked screen reader support (missing accessible name). The login page also had dead code attempting to implement this feature manually.
📸 Visuals: No visual changes, but the button now has an accessible name ("Show password" / "Hide password").
♿ Accessibility: Added dynamic aria-label to the toggle button to announce state changes to screen readers.

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PR created automatically by Jules for task 7214865278239618642 started by @nkissick-del

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Summary by cubic

Adds an accessible label to the password visibility toggle in the Input component to support screen readers. Cleans up the login page by removing a redundant manual toggle.

• Bug Fixes

  • Add dynamic aria-label to the toggle button so screen readers announce “Show password” / “Hide password”.

• Refactors

  • Move “Show/Hide password” strings to the common namespace for reuse.
  • Remove unused password toggle code from the login page.

^{Written for commit af415b4. Summary will update on new commits.}

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[cubic-dev-ai]

No issues found across 3 files