fix(#246): replace dashboard analytics fetch calls with authFetch

[0xPyxis]

Closes #246

Replaced direct fetch() calls in dashboard analytics components with authFetch() so authentication refresh handling is applied consistently.

CHANGES

• Updated ProgressDashboard to use authFetch for /api/analytics/overview
• Updated StreakDashboard to use authFetch for /api/analytics/streak
• Preserved existing loading, error, and abort-signal behavior

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[MRIARC-08]

@0xPyxis Code-side checks look good, but I’m holding this for maintainer manual UI review because it touches visible dashboard components.

Local checks:

• pnpm exec eslint src/components/ProgressDashboard.tsx src/components/StreakDashboard.tsx passes.
• pnpm exec tsc --noEmit passes.
• pnpm test passes: 8 files / 35 tests.

@MRIARC-08 Please manually verify the dashboard progress/streak loading and error states before merge.

[0xPyxis]

hey could you review this ??