feat(letsplot): implement bar-basic (#1348)

## Implementation: `bar-basic` - letsplot

Implements the **letsplot** version of `bar-basic`.

**File:** `plots/bar-basic/implementations/letsplot.py`

---
:robot: *[impl-generate
workflow](https://github.com/MarkusNeusinger/pyplots/actions/runs/20447581463)*

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

plots/bar-basic/implementations/letsplot.py

@@ -1,7 +1,7 @@
 """ pyplots.ai
 bar-basic: Basic Bar Chart
-Library: letsplot 4.8.1 | Python 3.13.11
-Quality: 94/100 | Created: 2025-12-13
+Library: letsplot unknown | Python 3.13.11
+Quality: 99/100 | Created: 2025-12-23
 """
 
 import pandas as pd
@@ -40,7 +40,7 @@
         axis_text_x=element_text(angle=45, hjust=1, size=16),  # noqa: F405
         axis_text_y=element_text(size=16),  # noqa: F405
         axis_title=element_text(size=20),  # noqa: F405
-        plot_title=element_text(size=20, hjust=0.5),  # noqa: F405
+        plot_title=element_text(size=24, hjust=0.5),  # noqa: F405
         panel_grid_major_x=element_blank(),  # noqa: F405
     )
 )

plots/bar-basic/metadata/letsplot.yaml

@@ -1,17 +1,25 @@
 library: letsplot
 specification_id: bar-basic
-created: 2025-12-13 23:13:54+00:00
-updated: 2025-12-13 23:13:54+00:00
+created: '2025-12-23T00:23:43Z'
+updated: '2025-12-23T00:28:24Z'
 generated_by: claude-opus-4-5-20251101
-workflow_run: 20199224376
-issue: 612
+workflow_run: 20447581463
+issue: 0
 python_version: 3.13.11
-library_version: 4.8.1
+library_version: unknown
 preview_url: https://storage.googleapis.com/pyplots-images/plots/bar-basic/letsplot/plot.png
 preview_thumb: https://storage.googleapis.com/pyplots-images/plots/bar-basic/letsplot/plot_thumb.png
 preview_html: https://storage.googleapis.com/pyplots-images/plots/bar-basic/letsplot/plot.html
-quality_score: 94
+quality_score: 99
 review:
-  strengths: []
-  weaknesses: []
-  improvements: []
+  strengths:
+  - Excellent use of geom_text with label_format for currency formatting ($X,XXX)
+  - Clean ggplot2-style grammar with proper layering
+  - Appropriate use of pd.Categorical to preserve category order
+  - Well-configured theme with proper font sizes (16pt axis text, 20pt titles, 24pt
+    plot title)
+  - Correct 16:9 aspect ratio (1600x900 base, scaled 3x to 4800x2700)
+  - Value labels positioned above bars using position_nudge for clarity
+  weaknesses:
+  - Could use scale_y_continuous with labels parameter for formatted y-axis tick values
+    (currently shows raw numbers like 45,000 instead of $45K)