added forgot password option

[Aditya8369]

Updated files:

• Added forgot link on sign-in page: signin.html
• Added forgot-password screen: forgot.html
• Added reset-password screen: reset.html
• Added forgot/reset logic with localStorage and secure password re-hash: auth.js
• Added small UI styles for inline link and status messages: auth.css

What the new flow does:

1. User clicks Forgot Password on signin.html.
2. On forgot.html, user enters email.
3. If email matches the stored user, a simulated reset link is shown (demo behavior), and reset email is stored in localStorage.
4. On reset.html, user enters new password + confirm password.
5. Password is validated with the same strength rules, then updated in localStorage using the existing hash flow (PBKDF2), and user is redirected to sign in.

Implementation notes:

• Kept compatibility with your existing secure auth model in auth.js, instead of introducing plain-text password storage.
• Reset state uses a dedicated localStorage key: passwordResetEmail.
• Legacy plain-text password field is removed when password reset completes.

Validation:

• No new JS/HTML errors were reported.
• Existing CSS Safari compatibility warnings for backdrop-filter remain in auth.css and auth.css (pre-existing, not from this feature).

closes #55

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[Aditya8369]

@JiyaBatra hello please check this PR and let me know if any changes are required