fix(compat): support nvim 0.12 with targeted workarounds

nvim 0.12 injection parsing bug (languagetree nil node) affects:
- treesitter-context: disable (no configurable workaround)
- quickfile: disable (triggers built-in highlighter injection path)
- rainbow-delimiters: force global strategy (local triggers is_in_node_range)
- snacks indent.scope: disable (treesitter scope detection hits same bug)

Re-enable when nvim 0.12.1 / upstream fixes land.

Author: charliie-dev

lua/modules/configs/editor/rainbow_delims.lua

@@ -1,37 +1,16 @@
 return function()
-	---@param threshold number @Use global strategy if nr of lines exceeds this value
-	local function init_strategy(threshold)
-		return function()
-			-- Disable on very large files
-			local line_count = vim.api.nvim_buf_line_count(0)
-			if line_count > 15000 then
-				return nil
-			end
-
-			-- Disable on parser error
-			local errors = 200
-			vim.treesitter.get_parser():for_each_tree(function(lt)
-				if lt:root():has_error() and errors >= 0 then
-					errors = errors - 1
-				end
-			end)
-			if errors < 0 then
-				return nil
-			end
-
-			return line_count > threshold and require("rainbow-delimiters").strategy["global"]
-				or require("rainbow-delimiters").strategy["local"]
-		end
-	end
+	-- local strategy triggers vim.treesitter.is_in_node_range() which hits
+	-- a nil node bug in nvim 0.12 injection parsing; use global only.
+	local global = require("rainbow-delimiters").strategy["global"]
 
 	vim.g.rainbow_delimiters = {
 		strategy = {
-			[""] = init_strategy(500),
-			c = init_strategy(300),
-			cpp = init_strategy(300),
-			lua = init_strategy(500),
-			vimdoc = init_strategy(300),
-			vim = init_strategy(300),
+			[""] = global,
+			c = global,
+			cpp = global,
+			lua = global,
+			vimdoc = global,
+			vim = global,
 		},
 		query = {
 			[""] = "rainbow-delimiters",

lua/modules/configs/ui/snacks.lua

@@ -74,7 +74,7 @@ return function()
 				duration = { step = 20, total = 300 },
 			},
 			scope = {
-				enabled = true,
+				enabled = false, -- nvim 0.12 injection parsing bug triggers via treesitter scope
 				char = "┃",
 				underline = false,
 			},
@@ -127,7 +127,7 @@ return function()
 			},
 		},
 		terminal = { enabled = true },
-		quickfile = { enabled = true },
+		quickfile = { enabled = false }, -- nvim 0.12 injection parsing bug via highlighter
 		picker = {
 			enabled = true,
 			sources = {

lua/modules/plugins/editor.lua

@@ -152,6 +152,7 @@ editor["nvim-treesitter/nvim-treesitter"] = {
 		},
 		{
 			"nvim-treesitter/nvim-treesitter-context",
+			enabled = false, -- nvim 0.12 injection parsing bug via parse(range, callback)
 			config = require("editor.ts-context"),
 		},
 		{