Make preview config widgets default-aware and show override state explicitly

[Copilot]

The preview-only config editor treated “unset” as a missing value, but Wave’s config system uses unset to mean “inherit the shipped default.” This updates the preview widgets so default vs explicit override is visible and selectable, including cases where an override matches the default value.

• Default is now a first-class field state

  • Booleans now expose Default (...), True/False (or On/Off) instead of only a binary toggle.
  • Enum/select fields now include a default option with the effective shipped value.
  • Text, number, and font-size fields now surface Use Default when overridden.

• Override vs inherited state is visible

  • Added per-field badges: Using default vs Overridden.
  • Added inline default value display for all supported field types.
  • Preserved the distinction between:
    • inherited default
    • explicit override with a different value
    • explicit override with the same value as the default

• Preview updated to demonstrate real config semantics

  • The sample editor now loads shipped defaults from defaultconfig.
  • Added examples for:
    • inherited values
    • changed overrides
    • explicit empty-string override
    • same-as-default override (window:magnifiedblocksize: 0.95)
  • Added side panels for:
    • sparse JSON output (settings.json contents)
    • effective merged values
    • override summary

• Support code

  • Added small helpers for:
    • isConfigValueOverridden
    • getEffectiveConfigValue
  • Extended focused tests around default/inherited behavior.

<ConfigBooleanField
    configKey="term:cursorblink"
    label="Cursor blink"
    value={settings["term:cursorblink"]}
    defaultValue={DefaultSettings["term:cursorblink"]}
    onValueChange={(value) => setSettingsValue(setSettings, "term:cursorblink", value)}
    trueLabel="On"
    falseLabel="Off"
/>

• UI preview
  • 

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