refactor: Style compiler cleanup

[wodeni]

Description

Related issue/PR: #888

This PR refactors multiple modules related to the Style compiler to prepare for the rewrite.

Implementation strategy and design decisions

• Add Opt and CompGraph back to @penrose/browser-ui back for debugging
• Organize Style.ts
• Delete any dead code
• Clean up State and remove unused properties
• Refactor evalFns: the original version generates code (i.e. calls genCode) for every single objective and constraint. This PR adds secondary outputs that are intermediate nodes in the optimization graph. Retrieving the energy values of those functions is a matter of pulling the secondary outputs out of the graph.

Examples with steps to reproduce them

This PR adds Opt back, which reports the energy values of individual constraints and objectives:

Note that this view doesn't report the gradients for objectives. See comment here:

penrose/packages/browser-ui/src/inspector/views/Opt.tsx

Line 27 in 8d7547e

// COMBAK: objective gradient norms are currently deprecated, because the

Checklist

• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new ESLint warnings
• I have reviewed any generated changes to the diagrams/ folder

[cloudflare-pages]

Deploying with    Cloudflare Pages

Latest commit:	f1b00e1
Status:	✅  Deploy successful!
Preview URL:	https://6eaecad7.penrose-panes.pages.dev

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[codecov]

Codecov Report

Merging #971 (f1b00e1) into main (054e57f) will decrease coverage by 0.38%.
The diff coverage is 91.08%.

@@            Coverage Diff             @@
##             main     #971      +/-   ##
==========================================
- Coverage   63.52%   63.13%   -0.39%     
==========================================
  Files          62       62              
  Lines        7909     7813      -96     
  Branches     1830     1814      -16     
==========================================
- Hits         5024     4933      -91     
+ Misses       2766     2762       -4     
+ Partials      119      118       -1     

Impacted Files	Coverage Δ
packages/core/src/engine/EngineUtils.ts	62.75% <ø> (-2.29%)	⬇️
packages/core/src/types/ad.ts	100.00% <ø> (ø)
packages/core/src/utils/Util.ts	58.33% <87.50%> (+3.55%)	⬆️
packages/core/src/compiler/Style.ts	78.29% <90.90%> (-0.60%)	⬇️
packages/core/src/engine/Optimizer.ts	80.97% <92.85%> (-1.55%)	⬇️
packages/core/src/engine/Autodiff.ts	81.85% <100.00%> (ø)
packages/core/src/engine/Evaluator.ts	33.51% <100.00%> (+0.17%)	⬆️
packages/core/src/index.ts	69.11% <100.00%> (-0.96%)	⬇️

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