fix: bar chart enter animation & min size

[hcopp]

What changed? Why?

This PR cleans up a lot of issues with BarChart

1. Better organization - store/reuse from bar.ts as much as possible
2. Enter animation fixes - we weren't doing stack animations correctly on web for horizontal charts
3. BarMinSize/StackMinSize - before barMinSize wouldn't work at all; stackMinSize worked but wouldn't impact enter animation; now the min size is used from the start to the end, aligning with motion expectations

UI changes

Slowed down

iOS Old	iOS New
BeforeMobile.mov	AfterMobile.mov

Web Old	Web New
Before.mov	After.mov

Testing

How has it been tested?

• Unit tests
• Interaction tests
• Pseudo State tests
• Manual - Web
• Manual - Android (Emulator / Device)
• Manual - iOS (Emulator / Device)

Testing instructions

Illustrations/Icons Checklist

Required if this PR changes files under packages/illustrations/** or packages/icons/**

• verified visreg changes with Terran (include link to visreg run/approval)
• all illustration/icons names have been reviewed by Dom and/or Terran

Change management

type=routine
risk=low
impact=sev5

automerge=false

[cb-heimdall]

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✅ CODEOWNERS

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