feat: v1.2.0 — auto color, hover mode, Plasma decoration control

[comxd]

Summary

Auto Color from Icon

• Global toggle to automatically extract and apply dominant icon color for all apps
• Per-app skip list, auto indicator (4 states: active/pending/skipped/overridden)
• Refresh button to re-extract after icon theme changes
• Queue-based batch extraction with session re-validation

Visual Enhancements

• Soften colors: theme-adaptive tinting for better readability
• HSL partial desaturation: alternative minimized style that keeps the hue
• Window count segment indicators for grouped windows (up to 5 dots)
• Overlay pulse animation when hovering a window in the Windows tab
• WindowsTab swatch redesign with "inherit" label and contextual tooltips

Plasma Decoration Control

• Per-state theme border customization (focused/normal/hover)
• Custom borders: choose which Plasma theme borders to show per state
• Hide all: suppress entire Plasma decoration (borders + background)

Hover Window Mode

• Full collapsible section with hide/background/custom style options
• Priority-aware state management: hover > focused > minimized > normal

UI Polish

• Section headers: AbstractButton with symmetric padding and hover highlight
• Consistent tab margins and help text spacing across all 4 tabs

Bug Fixes

• CPU loop (28%) from persistTimer feedback loop
• Race condition on stale paletteChanged results
• hasAppColor blocking manual colors for skipped apps
• Auto-color reactivation delay when re-enabling after skip
• drainTimer polling waste

Test plan

• Enable auto color → verify colors applied to all apps
• Toggle soften colors on dark/light themes
• Test desaturation styles (grayscale vs partial)
• Open multiple windows of same app → verify segment dots
• Hover window in Windows tab → verify pulse on taskbar
• Per-state decoration: Default / Custom borders / Hide all
• Hover mode: Normal / Hide / Background / Custom
• Section headers: centered text, hover fill between separators
• Tab margins consistent across Applications/Windows/Settings/Nyan