🎨 Palette: Improve Team Lab unit selection UX

[Gunnarguy]

💡 What: Added max_selections=4 to the Team Lab unit multiselect and removed the manual truncation/warning banner logic. Updated the help text to be clearer.
🎯 Why: Prevents the user from selecting an invalid state (more than 4 units) proactively rather than allowing the invalid state and showing a retroactive warning banner. This makes the interface smoother and more intuitive.
📸 Before/After:
Before: Users could select infinite units, triggering a yellow warning banner and silently dropping the 5th+ unit from calculations.
After: The multiselect visually greys out options and prevents clicking after 4 units are selected, completely removing the need for a warning banner.
♿ Accessibility: Reduces cognitive load by proactively preventing errors instead of requiring users to read and recover from warning states.

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PR created automatically by Jules for task 7753378864867968234 started by @Gunnarguy

Summary by Sourcery

Enforce the 4-unit limit directly in the Team Lab multiselect and document the UX pattern change in the Palette notes.

Bug Fixes:

• Prevent users from temporarily selecting more than 4 units in Team Lab by enforcing the limit at the multiselect component level.

Enhancements:

• Clarify the Team Lab unit selection help text to better describe the analysis performed.
• Remove the warning banner and manual truncation logic now that the multiselect enforces the 4-unit selection limit.

Documentation:

• Add Palette documentation on using Streamlit's max_selections for bounded multiselects instead of retroactive warnings.

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR updates the Team Lab Streamlit multiselect to enforce a native 4-unit selection limit via max_selections, simplifies the selection handling logic by removing manual truncation and warning UI, and documents the UX pattern change in the Palette guide.

Sequence diagram for Team Lab unit selection before max_selections

sequenceDiagram
    actor User
    participant Streamlit
    participant render_team_lab

    User->>Streamlit: st.multiselect
    Streamlit->>render_team_lab: render_team_lab(data)
    render_team_lab->>render_team_lab: len(selected_variant_ids) > 4
    render_team_lab->>Streamlit: st.warning
    render_team_lab->>render_team_lab: selected_variant_ids = selected_variant_ids[:4]
    render_team_lab->>Streamlit: st.info (empty state when no selections)

Loading

Sequence diagram for Team Lab unit selection after max_selections

sequenceDiagram
    actor User
    participant Streamlit
    participant render_team_lab

    User->>Streamlit: st.multiselect max_selections=4
    Streamlit->>User: Prevent selecting more than 4 units
    Streamlit->>render_team_lab: render_team_lab(data)
    render_team_lab->>Streamlit: st.info (empty state when no selections)
    note over User,Streamlit: Warning banner and manual truncation removed

Loading

File-Level Changes

Change	Details	Files
Use Streamlit's native multiselect selection limit instead of manual truncation and warnings for Team Lab unit selection.	Update the Team Lab multiselect help text to describe the combined SP economy and defensive coverage analysis for up to 4 units. Add max_selections=4 to the Team Lab multiselect configuration to enforce the 4-unit limit at the UI level. Remove post-selection logic that showed a warning and truncated the selection list to the first 4 units.	src/grandchase_meta_analyzer/explorer_app.py
Document the design learning and guidance around using max_selections for bounded Streamlit multiselects.	Add a new Palette entry describing why native max_selections is preferred over warning-based truncation when there is a hard conceptual limit. Capture the specific Team Lab 4-unit use case as an example of this UX pattern.	.Jules/palette.md

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[Copilot]

Pull request overview

This PR improves the Team Lab unit-selection UX in the Streamlit explorer by enforcing the 4-unit constraint directly at the UI component level, avoiding temporary invalid states and removing now-redundant warning/truncation logic.

Changes:

• Enforce a hard 4-unit selection limit using st.multiselect(max_selections=4) in Team Lab.
• Remove the manual “warn + truncate to first 4” post-validation behavior and update the help text accordingly.
• Document the UX pattern (“prefer native bounded multiselects over retroactive warnings”) in Palette notes.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/grandchase_meta_analyzer/explorer_app.py	Uses Streamlit’s native max_selections=4 for Team Lab unit selection and removes manual warning/truncation logic.
.Jules/palette.md	Adds a Palette note documenting the preferred UX pattern for bounded multiselect inputs.