Baseline GUI scaling with corner resize before display-scale and dime…

…nsions refactor

- ScaledLayout and scaling propagation across GUI hierarchy
- Resizable editor with corner component and preset combo
- PluginDimensions and planning docs snapshot

User-adjustable GUI scaling and layout fixes

- Add global GUI scaling factor propagated from HeaderPanel to all panels and widgets
- Fix layout rounding accumulation: float-based position calculation, single roundToInt at setBounds
- Fix clipping at 125%: last child takes remaining width in TopPanel, BottomPanel, MiddlePanel
- InternalPatchesPanel: remove unused skin parameters from five setup methods
- .gitignore: consolidate Quality and Workbench journal patterns

Adopt industry-standard GUI scaling terminology

- Replace "Zoom" terminology with "Scale" throughout codebase
- Update HeaderPanel label from "ZOOM :" to "GUI :" (industry standard)
- Add transparent migration from old guiZoomLevelId to new guiScaleId
- Archive experimental integer scale rendering plan for future reference

This aligns with conventions used by professional audio plugins (Serum, Fabfilter, etc.).

Add GUI zoom functionality with persistent zoom level

- Implement zoom level control: apply scale to MainComponent via AffineTransform, resize editor window
- Persist selected zoom level in plugin state and restore on reopen
- Extend zoom presets to 50%–400% (10 levels) in header ComboBox

Clean Code refactoring and architectural improvements

- Split PluginDescriptors.cpp into 5 domain-specific files
- Split ApvtsFactory into ApvtsLayoutBuilder and ApvtsValidator
- Create ISkin sub-interfaces (ISkinColours, ISkinValues, ISkinFonts)
- Centralize APVTS identifiers in ApvtsTypes, zoom levels in PluginIDs::Settings::ZoomLevels
- Consolidate WidgetFactory descriptor map building
- Apply std::optional for explicit absence signaling
- Extract layoutSliderLine() and Skin colour initialization sub-methods

Refactor PluginDimensions hierarchy and PatchNameDisplay

- Restructure PluginDimensions: nest Body child panels, simplify namespace names (remove Panel suffix)
- Apply DRY: SectionHeader, ModuleHeader, HorizontalSeparator reference panel dimensions
- Refactor PatchNameDisplay: inject dimensions at construction, move layout constants to MiddlePanel

PluginDescriptors and Shared layer improvements

- Reorganize PluginDescriptors: Matrix Modulation by bus, header Init before Bus 0, MatrixModulationDetail namespace
- Add PluginHelpers (makeStringArray, getGroupDisplayName) and Matrix1000Limits
- Reorder and document MatrixModulationSection API in header; bus variables lowerCamelCase
- Move Development Plans into year subfolders (2025/, 2026/); align factories and panels with descriptor API

Refactor PluginDisplayNames and PluginIDs namespace hierarchy

- PluginDisplayNames: Section/Module/ParameterWidgets/StandaloneWidgets and ChoiceLists sub-namespaces; consistent naming (kEnvelope1-3, kChannel1-16, kKeyboard, kPortamento, etc.)
- PluginIDs: MatrixModulationSection layout (kModulationBusCount, kMatrixModulationInit in StandaloneWidgets); ModulationBus::ParameterWidgets; PatchMutator kEnvelope1-3
- Single source of truth for display names and IDs; all references updated across descriptors, panels, and factories

Add Patch Mutator module and embed PT Sans Narrow fonts

- Add Patch Mutator panel with randomization and mutation controls
- Embed PT Sans Narrow fonts (BinaryData) for cross-platform distribution
- Extract fonts from system TTC for consistent rendering
- Centralize font heights in SkinValues
- Add OFL license attribution in README
- Update GUI screenshot

Improve pixel-perfect rendering precision in GUI widgets

- Add std::round() calls for crisp pixel alignment in multiple widgets
- Simplify curve point drawing in EnvelopeDisplay
- Adjust BankUtilityPanel height