fix: YooAsset native builder support, bundle granularity, and dropdown stale values (#631, #632)

[JasonXuDeveloper]

Summary

Addresses two reporter issues plus a related UX gap found during review.

Fixes #632 — YooAsset native builder + bundle granularity

1. MissingMethodException when building with YooAsset's AssetBundleBuilder
   YooAsset's BuildPipelineViewerBase.CreateEncryptionServicesInstance() calls Activator.CreateInstance(type) with no arguments, but JEngine's {Aes,Xor,ChaCha20}EncryptionServices and {Aes,Xor,ChaCha20}Manifest{Process,Restore} only exposed config-taking constructors. Added parameterless default constructors that chain to the existing ones via *Config.Instance (the same singleton JEngine's internal BundleEncryptionConfig<…> already resolves). Existing internal instantiation — which passes the config via Activator.CreateInstance(type, new object[] { config }) — still matches the parameterized overload, so no behavior change for the JEngine panel path.

2. JEngine output had fewer/larger bundles than YooAsset's native builder for identical collector configs
   Root cause: YooAsset's ScriptableBuildPipelineViewer.ExecuteBuild (and BuiltinBuildPipelineViewer) both set buildParameters.EnableSharePackRule = true, but JEngine's BuildManager.CreateBuildParameters() omitted it, falling back to the BuildParameters.cs default of false. With it disabled, YooAsset's TaskGetBuildMap step 7 skips shared-bundle extraction entirely, inlining shared assets into every referencing bundle — producing fewer/larger bundles and duplicated payload. Matches the reporter's screenshot. Fix: set EnableSharePackRule = true in BuildManager. Other build params (LZ4, HashName, StripUnityVersion, TrackSpriteAtlasDependencies) already match YooAsset UI defaults or are intentional JEngine overrides.

Fixes #631 — Dropdowns show stale values after YooAsset package rename

• BootstrapEditorUI (inspector) and the Build Panel (SettingsUIBuilder + PanelUI) passed the serialized value as the PopupField default without checking it existed in the choices list. When a YooAsset package was renamed, Unity's PopupField silently fell back to index 0 without firing a change event — UI and serialized value desynced. Single-entry dropdowns exhibited the same class of issue.
• Fix: prepend a "None" sentinel so every dropdown has ≥ 2 entries; when the stored value isn't in the current choices it displays as None; selecting None clears the stored value to empty. Applied uniformly to the 7 dropdowns in BootstrapEditorUI, the Package dropdown in SettingsUIBuilder, and the (previously missed) Package dropdown in PanelUI.

Related improvements (not reported, found during review)

• DRY: Extracted WithNoneOption / ResolveDropdownValue / NormalizeDropdownSelection + NoneDropdownOption into JEngine.Core.Editor.EditorUtils. All three call sites now share the same implementation.
• Auto-refresh on external change: The Bootstrap inspector polls a signature of external dropdown sources (packages, asmdefs, scenes, classes/methods, AOT files, dynamic keys) every 500ms and rebuilds when it changes, plus rebuilds on EditorApplication.focusChanged. The Build Panel (EditorWindow) rebuilds on OnFocus (skipped mid-build). A package rename in the AssetBundle Collector window now propagates without requiring the user to reselect the asset.

Chore

• Rebuilt the main asset package and hot-update AOT assemblies with EnableSharePackRule = true so a fresh clone of this branch runs without a manual rebuild. Old monolithic bundles are removed; new share-pack-split bundles are committed.

PR strategy

Per discussion the PR should be merged via "Rebase and merge" so all six commits land on master individually with their own scopes, rather than squash-merged.

Test plan

• In JEngine Bootstrap panel, pick AES → Open YooAsset's AssetBundleBuilder → select AesEncryptionServices (+ matching manifest services) → build succeeds (previously MissingMethodException). Repeat for XOR and ChaCha20.
• Same collector config, build once via JEngine panel, once via YooAsset's builder — bundle counts/sizes now match within rounding.
• Open Bootstrap inspector with packageName = "main". In AssetBundle Collector, rename the sole package to game. Dropdown updates to None within 500ms without reselecting the asset (polling). Selecting game persists.
• Same rename scenario with Build Panel open: on focus return it rebuilds and shows None.
• Start a build, switch focus away and back to the Build Panel mid-build — content is not rebuilt (build state preserved).
• Undo/redo still rebuilds inspector content (existing behavior unchanged).
• Fresh clone of this branch opens and plays without a manual "Build All".

[github-actions]

Unity Test Results

✅ EditMode: All tests passed
✅ PlayMode: All tests passed

Unity Version: 2022.3.55f1
Project Path: UnityProject

✅ All tests passed! The PR is ready for review.

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[codecov]

Codecov Report

❌ Patch coverage is 95.81152% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.99%. Comparing base (7193761) to head (a8b8094).
⚠️ Report is 13 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #633      +/-   ##
==========================================
+ Coverage   94.91%   94.99%   +0.07%     
==========================================
  Files          70       71       +1     
  Lines       10431    10583     +152     
==========================================
+ Hits         9901    10053     +152     
  Misses        530      530              

Flag	Coverage Δ
ui	95.44% <95.81%> (+0.08%)	⬆️
util	93.19% <ø> (ø)

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