fix: real profile/activity/report loaders + change-password API (#1504-#1507)

[Essther77-git]

Minimal, additive changes addressing the four assigned issues.

• Report page silently shows a fake 'Sample Land Title' (VERIFIED, risk 62) when the API call fails, and lets users download it as a PDF #1504 loadReport() so the report page stops showing a fake sample title
• Admin activity page falls back to hard-coded MOCK_ACTIVITY when the request fails #1505 loadAdminActivity() instead of the MOCK_ACTIVITY fallback
• Profile page shows a hard-coded 'Jane Doe' user and fakes saving with a timeout #1506 loadProfile() returns the real user, not a hard-coded "Jane Doe"
• Security settings: 'Change password' reports success without calling any API #1507 changePassword() actually calls the API before reporting success

Issues

Closes #1504
Closes #1505
Closes #1506
Closes #1507

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