Plotly Interactive Gantt Chart Project Sankey Infographic

Data visualization infographic titled "Gantt Chart Project"
Use a SANKEY FLOW as the dominant visual element, adapted to show project phase progression over time like a pipeline trend. Editorial data journalism illustration, FT / Bloomberg-grade chart aesthetics, vector-clean infographic layout, with Reuters / Economist editorial restraint and dark mode neon palette.

Main visual:
- A wide horizontal SANKEY FLOW / project pipeline showing project stages from left to right across time periods.
- Left-side nodes: "Discovery", "Planning", "Design", "Development", "Testing", "Launch".
- Flow transitions by month on a clear time grid: "Jan", "Feb", "Mar", "Apr", "May", "Jun".
- Use sharp axis labels and tick marks in English only: bottom time axis labeled "Project timeline (months)" with visible ticks at "Jan", "Feb", "Mar", "Apr", "May", "Jun".
- Add a small top label: "Illustrative workflow trend".
- Node widths and flow thicknesses should show realistic plausible illustrative project effort allocation and carryover.
- Suggested illustrative values to encode faithfully in the flow widths:
  - Jan: Discovery 100, Planning 80
  - Feb: Planning 70, Design 90
  - Mar: Design 75, Development 120
  - Apr: Development 140, Testing 60
  - May: Development 90, Testing 110
  - Jun: Testing 70, Launch 100
- Show continuity and drop-off between stages with smooth neon flows, preserving scale honestly with no misleading truncation or manipulation.
- Include compact labels on or beside nodes: "Discovery", "Planning", "Design", "Development", "Testing", "Launch" and metrics like "Effort index".
- Add a subtle legend in English: "Flow width = illustrative effort index".

Key insight callouts, each with a small icon, headline number, and short interpretation in English:
1. Rocket icon — headline "100" — text "Launch readiness peaks in Jun as final delivery reaches the highest completed-stage flow."
2. Code icon — headline "140" — text "Development peaks in Apr, marking the heaviest execution workload in the pipeline."
3. Clipboard icon — headline "90" — text "Design reaches strong momentum in Feb before effort shifts into build stages."
4. Bug icon — headline "110" — text "Testing intensity rises in May, signaling a concentrated validation phase before release."
5. Trend arrow icon — headline "6 months" — text "The project trend moves steadily from discovery to launch across a half-year schedule."

Source / data-note strip at the bottom in English:
- "Data note: Illustrative example for a gantt chart project pipeline. Figures are illustrative and not sourced from an external dataset."

Visual style and composition:
- Dark charcoal to near-black background.
- Neon accents: electric cyan, magenta, lime, violet, and amber for distinct stages and flows.
- High contrast typography, thin precise gridlines, disciplined Economist-style spacing, Reuters-like clarity.
- Clean vector infographic layout, subtle glow only on flows and callout icons, not excessive.
- Professional newsroom explainer mood: analytical, modern, credible, polished.
- No interface chrome, no browser window, no Plotly branding, no decorative clutter.
- Since target search intent is "plotly interactive", evoke an interactive-style structured data graphic aesthetic visually, but keep all on-image text in English and do not mention non-English text.

All text MUST be written in English (array). Every heading, label, caption, legend and metric name in the image must be in English — not English. Spell each English word correctly using English characters and diacritics. Numbers stay as digits, no fake authoritative sources cited, no watermarks Numbers labeled "illustrative" unless the user supplied specific sourced data. No fake authoritative sources cited (do not invent "Source: Reuters 2025" — use "Illustrative example" instead). No misleading axis truncation or scale manipulation.