Improve graph management and panel pop-outs

[Friss]

Summary

• improve graph panel channel management, drag/drop behavior, zoom-range stats, legend rendering, and resizable embedded gauge/tile layouts
• add scatter/histogram channel style menus, drag badges, and keep the popped-out graph channel manager usable even when a graph is emptied
• pop out track maps by default while preserving their home worksheet when saving or docking, and bump the workspace version to 0.2.1

Testing

• cargo check -p i3rs-app
• cargo test -p i3rs-app -q

[gemini-code-assist]

Code Review

This pull request updates the project to version 0.2.1 and introduces several UI improvements, including a "Manage Channels" window for graphs, drag-and-drop support for channel organization, and resizable graph tiles and embedded gauges. The graph legend now displays min, max, and average statistics for the visible time range, and channel colors are now persisted in histograms and scatter plots. Additionally, track maps now correctly return to their original worksheets after being docked. Feedback includes a suggestion to refine the index calculation for time-range statistics to improve accuracy and a note regarding potential layout issues when the number of graph tiles causes their combined minimum height to exceed the available space.

[chatgpt-codex-connector]

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