feat: implement guest-access news and emergency flows on android

[erinc00]

This PR implements the guest-accessible navigation flow on Android for public information pages and adds interactive emergency dialing support.

Included
• guest access to:
• Home
• News & Announcements
• Emergency Numbers
• guest drawer footer updated with:
• placeholder avatar/icon
• login/signup entry flow when tapped
• authenticated users keep access to the same pages
• authenticated drawer footer shows the initial-based avatar state
• news filtering support added for:
• All
• Preparedness
• Announcement
• Community
• emergency number rows are now interactive and open the phone dialer when tapped

Notes
• This PR focuses on navigation/accessibility behavior and placeholder/public information flows.
• Guest users are intentionally limited to public informational pages only.
• Authenticated users continue to access the same public pages with their authenticated drawer/avatar state.
• Emergency number interaction currently opens the device dialer and does not directly place a call.

[kckagancan]

AppNavGraph.kt

Critical issues

• Profile logout does not actually clear the auth session

  • In the ProfileScreen route, onLogout only navigates to Welcome.
  • It does not call AuthRepository.logout().
  • This means the user may appear logged out in the UI while the token/session still remains active.

• Protected routes are not guarded at the route level

  • Access control is currently enforced through canAccessRoute(...) and navigateToDrawerRoute(...).
  • This only protects navigation when it goes through that helper.
  • Protected screens such as MyHelpRequests, AssignedRequest, Profile, Settings, Notifications, GatheringAreas, EditProfile, and PrivacySecurity do not have their own auth guard inside their composable(...) blocks.
  • Because of that, guest users may still reach these screens through direct navigation, back stack behavior, or future incorrect wiring.

---

[erinc00]

Thanks for the review, addressed both points.

Profile logout now clears auth/session before navigating to Welcome.
Added composable-level auth guards for truly protected pages (Profile, EditProfile, Settings, Privacy & Security) to prevent direct/backstack guest access.
Kept guest access for content pages (including Assigned Request) based on current product decision.

[kckagancan]

Looks fine now. Great work.