Add Class Resources and Debuff Highlighting modules; migrate settings to AceDB profiles

Move CoA settings from E.global/E.private into a proper AceDB-3.0 database
(CoA.db, SavedVariables ElvUI_CoADB) with a Profiles options tab, since
ElvUI doesn't ship AceDBOptions-3.0 (vendored under Libraries/).

Add ClassResources.lua: hooks the custom-class resource frames (segment
bar, orb, bar, multi-cast bar) into ElvUI's Toggle Anchors, with a
per-frame hide checkbox in a new "Class Resources" options tab.

Add DispelHighlight.lua: highlights dispellable debuffs on unitframes,
with talent-aware filtering for custom classes.

Fix mover/anchor reliability for Class Resources and the Instance
(LayerPicker) button:
- Movers were only retried until the target frame existed, not until the
  mover was actually created, so frames that start at zero size (e.g. a
  resource bar before that resource is ever active) permanently lost
  their mover.
- Class resource frames re-anchor themselves on refresh, stomping the
  mover's anchor; hook SetPoint to snap back to the mover holder whenever
  something else repositions the frame.
- Native click-drag on these frames ends with the engine calling SetPoint
  directly, severing the mover anchor entirely. Permanently block drag
  (script and RegisterForDrag) instead of clearing it once.

Modules/LayerPicker.lua

@@ -11,7 +11,7 @@ local function UpdateFont(button)
 	local text = button and _G[button:GetName().."Text"]
 	if not text then return end
 
-	text:FontTemplate(LSM:Fetch("font", E.global.CoA.instanceButtonFont), E.global.CoA.instanceButtonFontSize, E.global.CoA.instanceButtonFontOutline)
+	text:FontTemplate(LSM:Fetch("font", CoA.db.profile.instanceButtonFont), CoA.db.profile.instanceButtonFontSize, CoA.db.profile.instanceButtonFontOutline)
 
 	button:SetSize(
 		math.max(MIN_WIDTH, text:GetStringWidth() + PAD_X),
@@ -34,22 +34,44 @@ do
 	end
 end
 
+-- A single nil-out isn't enough: native dragging ends with the engine
+-- calling SetPoint directly on the frame, severing the live anchor to our
+-- mover holder. So we don't just clear drag once, we permanently intercept
+-- any future attempt to turn it back on. The CoAClearing* guards stop our
+-- own corrective calls from re-triggering these same hooks.
 local function DisableDrag(button)
 	if button.CoADragDisabled then return end
 	button.CoADragDisabled = true
 
 	button:SetScript("OnDragStart", nil)
 	button:SetScript("OnDragStop", nil)
+	button:RegisterForDrag()
+
+	hooksecurefunc(button, "SetScript", function(self, script, handler)
+		if handler and (script == "OnDragStart" or script == "OnDragStop") and not self.CoAClearingDragScript then
+			self.CoAClearingDragScript = true
+			self:SetScript(script, nil)
+			self.CoAClearingDragScript = false
+		end
+	end)
+
+	hooksecurefunc(button, "RegisterForDrag", function(self, ...)
+		if select("#", ...) > 0 and not self.CoAClearingDrag then
+			self.CoAClearingDrag = true
+			self:RegisterForDrag()
+			self.CoAClearingDrag = false
+		end
+	end)
 end
 
 local function SetupMover(button)
-	if CoA.layerPickerMoverCreated then return end
+	if CoA.layerPickerMoverCreated then return true end
 
 	local width, height = button:GetSize()
-	if width == 0 or height == 0 then return end
+	if width == 0 or height == 0 then return false end
 
 	local left, bottom = button:GetLeft(), button:GetBottom()
-	if not left or not bottom then return end
+	if not left or not bottom then return false end
 
 	CoA.layerPickerMoverCreated = true
 
@@ -74,6 +96,8 @@ local function SetupMover(button)
 	else
 		Anchor()
 	end
+
+	return true
 end
 
 local function SkinButton(button)
@@ -92,11 +116,11 @@ local function TryHook()
 
 	if button then
 		DisableDrag(button)
-		SetupMover(button)
 		SkinButton(button)
+		return SetupMover(button)
 	end
 
-	return button ~= nil
+	return false
 end
 
 function CoA:InitializeLayerPicker()