Optimize particle inspector module stack UI

[AlexCat315]

Visual Refinements:

• Replace drag handle with accent color indicator bar
• Reduce stageBadgeWidth from 96 to 78 for tighter layout
• Remove expanded module border, use surfaceRaised background instead
• Simplify module header layout: remove secondary spacer, add accent bar
• Update summary chip padding and corner radius
• Reduce border opacity for badges

Layout Adjustments:

• Tighten card padding (24 -> 16), row heights (72 -> 58)
• Reduce module editor row height (50 -> 46) and parameter chrome (58 -> 34)
• Adjust spacing between groups and rows
• Reduce header height (88 -> 62), remove list padding

Field Grouping:

• Add primaryParticleInspectorFieldIDs for texture field
• Split particle inspector fields into: module stack + primary + legacy (collapsed)
• Restore Modified button to summary bar

Module Parameter Surface:

• Simplify header: remove Parameters label, show summary only
• Remove tone-colored border, use divider instead
• Show Disabled badge only when module is disabled

Runtime Diagnostic Card:

• Remove tone-colored accent bar
• Reduce border opacity from full to 0.45
• Remove Settings/Linked badge