feat: add stream Gantt chart view

[Abdul0905]

Overview

This PR adds a Stream Gantt chart view that displays all streams on an interactive horizontal timeline, color-coded by vesting status, with day/week/month zoom levels and click-through navigation to stream details.

Related Issue

Closes #

Changes

📊 Stream Gantt View

• [ADD] frontend/src/components/StreamGantt.tsx

  • Horizontal Gantt chart rendering each stream as a row on a shared timeline.
  • Color-coded bars: gray = unvested, blue = vested, green = claimed.
  • Zoom controls switch between day, week, and month views.
  • Clicking a bar navigates to the corresponding stream detail page.

• [MODIFY] frontend/src/pages/DashboardPage.tsx

  • Integrates StreamGantt into the dashboard analytics area.
  • Passes stream data and zoom state to the Gantt component.

Verification Results

npm run build
✅ Build passes

Live acceptance check:
✅ Renders 50 streams without layout issues
✅ Day/week/month zoom levels work correctly
✅ Clicking a bar navigates to stream detail

Acceptance Criteria	Status
Renders for up to 50 streams	✅ Verified with 50 streams
Zoom levels work correctly	✅ Day/week/month views switch and rescale correctly
Click navigates to stream detail	✅ Bar click opens the correct stream detail page

Closes #763

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