🎨 Palette: Refactor Unit multiselect with max_selections and improve empty state UX

[Gunnarguy]

• 💡 What: Refactored the st.multiselect for "Units" in the Team Lab section to use the native max_selections=4 parameter instead of post-interaction validation and truncation. Also added a nice material icon to the empty state info message.
• 🎯 Why: Preventing users from selecting more than 4 items proactively is better UX than letting them select 5, truncating it to 4, and showing a warning message. The empty state icon makes the UI more welcoming and less sterile.

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PR created automatically by Jules for task 7071149117956282930 started by @Gunnarguy

Summary by Sourcery

Refine the Team Lab units multiselect UX by enforcing a hard limit of four selections and improving the empty-state presentation.

New Features:

• Limit Team Lab unit selection to a maximum of four units via the multiselect control.
• Enhance the Team Lab empty state with a material icon to make informational messaging more visually engaging.

Documentation:

• Extend the Jules palette documentation with guidance on using multiselect max_selections and native UI constraints for better UX.

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Refactors the Team Lab units multiselect to use Streamlit's native max_selections constraint and improves the empty-state informational message with a material icon, while documenting the UX rationale in the palette notes.

Sequence diagram for the updated Team Lab units multiselect with max_selections

sequenceDiagram
    actor User
    participant StreamlitApp
    participant render_team_lab

    User->>StreamlitApp: interact with Team Lab UI
    StreamlitApp->>render_team_lab: render_team_lab(data)
    render_team_lab->>StreamlitApp: st.multiselect("Units", max_selections=4)

    alt [no units selected]
        render_team_lab->>StreamlitApp: st.info("Select up to 4 units to inspect SP economy and defensive coverage.", icon=:material/science:)
        StreamlitApp-->>User: empty state with material icon
    else [1 to 4 units selected]
        render_team_lab->>render_team_lab: analyze selected_variant_ids
        StreamlitApp-->>User: show Team Lab analysis
    end

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File-Level Changes

Change	Details	Files
Use Streamlit's native max_selections on the Team Lab units multiselect instead of manual post-selection truncation and warnings.	Update the multiselect help text to describe analyzing up to 4 units without mentioning truncation behavior. Add max_selections=4 to the units multiselect to proactively prevent selecting more than four items. Remove the conditional logic that warns and truncates selections when more than four units are chosen. Keep the existing empty-state check but rely on the multiselect constraint to maintain valid selections.	src/grandchase_meta_analyzer/explorer_app.py
Enhance the Team Lab empty-state info banner with a material icon and document the UX pattern in palette notes.	Augment the empty-state st.info call with a Material Symbols icon shortcode specific to science analysis. Retain the explanatory empty-state message text while adding visual differentiation. Add a new palette entry describing the learning around st.multiselect max_selections and the decision to favor native UI constraints over post-interaction validation.	src/grandchase_meta_analyzer/explorer_app.py .Jules/palette.md

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[sourcery-ai]

Hey - I've left some high level feedback:

• Consider extracting the 4 limit into a named constant shared between max_selections and the help/empty-state text so they stay in sync if the limit needs to change later.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider extracting the `4` limit into a named constant shared between `max_selections` and the help/empty-state text so they stay in sync if the limit needs to change later.

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[Copilot]

Pull request overview

This PR improves the Streamlit “Team Lab” unit-selection UX by enforcing a hard cap of 4 selected units directly in the st.multiselect widget and by making the empty-state banner more visually distinctive via a Material icon.

Changes:

• Switched Team Lab “Units” multiselect to use Streamlit’s native max_selections=4 instead of truncating selections after the fact.
• Updated the Team Lab empty state info banner to include a Material icon.
• Added palette documentation describing why to prefer native UI constraints for st.multiselect.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/grandchase_meta_analyzer/explorer_app.py	Enforces max 4 unit selections via max_selections and enhances empty-state st.info presentation.
.Jules/palette.md	Documents the multiselect max_selections UX guideline for future UI work.