Add export selector to Report

[ahuang11]

Builds upon #1701 to allow subsetting which subsections to download.

Area.mp4

The output:

In use:

dm.mp4

[codecov]

Codecov Report

❌ Patch coverage is 89.65517% with 27 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.29%. Comparing base (72297ab) to head (9d18a60).

Files with missing lines	Patch %	Lines
lumen/ai/report.py	82.14%	25 Missing ⚠️
lumen/tests/ai/test_report.py	98.03%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1702      +/-   ##
==========================================
+ Coverage   70.16%   70.29%   +0.13%     
==========================================
  Files         175      175              
  Lines       30093    30316     +223     
==========================================
+ Hits        21116    21312     +196     
- Misses       8977     9004      +27     

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[ahuang11]

Using:

import panel as pn
from lumen.ai.report import Action, Report, Section
from lumen.ai.editors import LumenEditor
from lumen.pipeline import Pipeline
from lumen.sources.duckdb import DuckDBSource
from lumen.views.base import VegaLiteView

pn.extension("tabulator", "vega")

class LoadDataAction(Action):
    async def _execute(self, context, **kwargs):
        source = DuckDBSource(tables={"penguins": "https://datasets.holoviz.org/penguins/v1/penguins.csv"})
        pipeline = Pipeline(source=source, table="penguins")
        return [pipeline.__panel__()], {"source": source}

class AnalyzeAction(Action):
    async def _execute(self, context, **kwargs):
        source = context["source"]
        avg_source = source.create_sql_expr_source(
            tables={"avg_data": "SELECT species, AVG(CAST(NULLIF(body_mass_g, 'NA') AS DOUBLE)) AS avg_mass FROM penguins GROUP BY species"}
        )
        pipeline = Pipeline(source=avg_source, table="avg_data")
        chart = VegaLiteView(
            pipeline=pipeline,
            spec={
                "$schema": "https://vega.github.io/schema/vega-lite/v5.json",
                "mark": "bar",
                "encoding": {
                    "x": {"field": "species", "type": "nominal"},
                    "y": {"field": "avg_mass", "type": "quantitative"},
                },
            },
            sizing_mode="stretch_width",
        )
        return [LumenEditor(component=chart, title="Avg Body Mass by Species")], {}

report = Report(
    Section(LoadDataAction(title="Load"), AnalyzeAction(title="Analyze"), title="Penguins")
)
report.show()

[philippjfr]

Why? Seems like this will trigger a bunch of events (needlessly).

[philippjfr]

Don't think this is correct, it unlinks the rx.

[philippjfr]

Again, confused here, views should be managed entirely by the rx expression.

[philippjfr]

Quite worried about some of the changes here. A big part of making things here not be insane was to manage the views of a TaskGroup via rx expressions. This eliminated a ton of logic around ensuring that things are reset and synced appropriately. Based on what I've seen here this undoes a lot of that.

I haven't followed the exact details but I'm not sure why that logic had to change at all.