Improve TBN chart: dark theme, better colors, regenerated outputs (closes #3)

- Dark theme (#131722) matching TradingView aesthetics
- Brighter trendline colors, white-outlined markers
- Increased dimensions to 1000x1400px
- Regenerated PNG and HTML outputs
- Verified docs page accuracy (no changes needed)
- Squad logs and decisions updated

Author: MDUYN

.squad/agents/devmeister3000/history.md

@@ -19,4 +19,5 @@
   - Three indicator modules used ambiguous variable `l` for low arrays — renamed to `low` in opening_gap.py, strong_weak_high_low.py, volume_imbalance.py. Other modules (like the older ones) used different patterns already.
   - `accumulation_distribution_zones` functions were imported in `pyindicators/__init__.py` but missing from `__all__` — added them. This was likely an oversight when the indicator was registered.
   - `Optional` was imported but unused in range_intelligence.py (the module uses `Union` instead).
-  - Pre-existing test failures exist in `test_market_structure` (CHoCH/BOS) — 9 errors unrelated to this work.- **2026-02-27 — TBN analysis notebook (Issue #3):** Created `analysis/indicators/trendline_breakout_navigator.ipynb` following Carlos's chart plan and the VWT notebook pattern. 3-row layout: candlestick + trendlines + markers (row 1, 70%), composite trend bar chart (row 2, 15%), volume bars (row 3, 15%). Outputs HTML, PNG to `static/images/indicators/` and `docs/static/img/indicators/`. `analysis/indicators/` directory is gitignored — used `git add -f` to commit. Stats block prints all 16 keys from `get_trendline_breakout_navigator_stats()`.
+  - Pre-existing test failures exist in `test_market_structure` (CHoCH/BOS) — 9 errors unrelated to this work.- **2026-02-27 — TBN analysis notebook (Issue #3):** Created `analysis/indicators/trendline_breakout_navigator.ipynb` following Carlos's chart plan and the VWT notebook pattern. 3-row layout: candlestick + trendlines + markers (row 1, 70%), composite trend bar chart (row 2, 15%), volume bars (row 3, 15%). Outputs HTML, PNG to `static/images/indicators/` and `docs/static/img/indicators/`. `analysis/indicators/` directory is gitignored — used `git add -f` to commit. Stats block prints all 16 keys from `get_trendline_breakout_navigator_stats()`.
+- **2026-02-28 — TBN dark theme chart overhaul (Issue #3):** Rewrote chart styling from light to dark theme (#131722 background, matching TradingView aesthetic). Key changes: (1) bright green `#00e676` / red `#ff5252` trendlines for contrast against dark background; (2) white-outlined markers (HH triangles, LL triangles, wick diamonds) for visibility; (3) increased chart height to 1000px + width 1400px; (4) Consolas monospace font; (5) subtle grid lines `rgba(255,255,255,0.06)` and muted neutral bars `#363a45` for zero-trend periods; (6) composite trend + volume bars at higher opacity for dark readability. Outputs regenerated to all three paths (HTML + 2× PNG).

.squad/agents/doc-vader/history.md

@@ -15,4 +15,4 @@
 - Indicator docs live in `docs/content/indicators/`.
 - Analysis notebooks in `analysis/indicators/` serve as visual examples.
 - Chart images in docs use UPPER_SNAKE_CASE alt text and path `/img/indicators/<name>.png`, placed immediately after the Example code block's closing fence.
-- Added TBN chart image reference to `docs/content/indicators/support-resistance/trendline-breakout-navigator.md` (Issue #3).
+- Added TBN chart image reference to `docs/content/indicators/support-resistance/trendline-breakout-navigator.md` (Issue #3).- Verified TBN docs page after chart improvement (Issue #3, 2026-02-28): image ref `![TRENDLINE_BREAKOUT_NAVIGATOR](/img/indicators/trendline_breakout_navigator.png)` correct, PNG exists at both `docs/static/img/indicators/` and `static/images/indicators/` (227 966 bytes), function signatures/params/return columns/signal logic/stats keys all match source. No changes needed.

.squad/decisions.md

@@ -45,3 +45,11 @@
 **Issue:** #3
 **What:** Created `analysis/indicators/trendline_breakout_navigator.ipynb` following Carlos's spec. PNG output to both `static/images/indicators/` and `docs/static/img/indicators/`. Used `git add -f` for gitignored analysis directory. Composite trend Y-axis hardcoded `[-3.5, 3.5]`.
 **Why:** Implements the chart plan. Dual PNG output lets Doc Vader reference the docs copy directly without extra steps.
+
+---
+
+### 2026-02-28T12:00:00Z: TBN Chart Dark Theme Overhaul
+**By:** DevMeister3000 (Core Dev)
+**Issue:** #3
+**What:** Switched TBN analysis notebook chart from light theme to professional dark theme (#131722 background). Updated all colors, opacities, markers, grid lines, and fonts for dark-background readability. Chart dimensions increased to 1000×1400px.
+**Why:** Existing light-themed chart was flagged as wrong/ugly. Dark themes are standard in financial charting tools and provide better contrast for overlaid trendlines and markers. Establishes precedent: future indicator analysis notebooks should use this dark theme palette for visual consistency.

.squad/log/2026-02-28T12-00-00Z-issue-3-tbn-chart-improve.md

@@ -0,0 +1,19 @@
+# Session Log — Issue #3: TBN Chart Improvement
+
+- **Timestamp:** 2026-02-28T12:00:00Z
+- **Issue:** #3 — Improve Trendline Breakout Navigator chart
+
+## Agents
+
+| Agent | Task | Status |
+|-------|------|--------|
+| DevMeister3000 | Dark theme, brighter colors, larger dimensions, regenerate outputs | ✅ Done |
+| Doc Vader | Verify docs page accuracy | ✅ Done (no changes) |
+
+## Outcome
+
+TBN chart updated to professional dark theme (#131722), brighter trendline colors, white-outlined markers, 1000×1400px. PNG and HTML regenerated. Docs page verified accurate — no edits required.
+
+## Decision
+
+Dark theme palette established as precedent for future indicator analysis notebooks (see `decisions.md`).

.squad/orchestration-log/2026-02-28T12-00-00Z-devmeister3000-tbn-chart-improve.md

@@ -0,0 +1,21 @@
+# Orchestration Log — DevMeister3000
+
+- **Timestamp:** 2026-02-28T12:00:00Z
+- **Agent:** DevMeister3000 (Core Dev)
+- **Issue:** #3 — Improve Trendline Breakout Navigator chart
+- **Task:** Improve TBN chart visuals
+
+## Summary
+
+Switched TBN analysis notebook chart to dark theme (#131722 background), updated trendline colors to brighter palette, added white-outlined markers, increased chart dimensions to 1000×1400px. Regenerated PNG and HTML outputs.
+
+## Files Changed
+
+- `analysis/indicators/trendline_breakout_navigator.ipynb` — updated chart styling
+- `analysis/indicators/trendline_breakout_navigator.html` — regenerated HTML export
+- `static/images/indicators/trendline_breakout_navigator.png` — regenerated PNG
+- `docs/static/img/indicators/trendline_breakout_navigator.png` — regenerated PNG (docs copy)
+
+## Status
+
+✅ Complete

.squad/orchestration-log/2026-02-28T12-00-00Z-doc-vader-tbn-docs-verify.md

@@ -0,0 +1,18 @@
+# Orchestration Log — Doc Vader
+
+- **Timestamp:** 2026-02-28T12:00:00Z
+- **Agent:** Doc Vader (DevRel)
+- **Issue:** #3 — Improve Trendline Breakout Navigator chart
+- **Task:** Verify TBN docs page accuracy
+
+## Summary
+
+Verified `docs/content/indicators/support-resistance/trendline-breakout-navigator.md` — chart image reference path is correct, all function signatures and parameters match current code, column descriptions are accurate. No changes needed.
+
+## Files Verified
+
+- `docs/content/indicators/support-resistance/trendline-breakout-navigator.md` — correct, no edits required
+
+## Status
+
+✅ Complete — no changes needed