fix: handle difference in nvim-cmp and blink.cmp cursor context

## Details

Issue: #310

`nvim-cmp` passes the cursor position as a (1,1)-indexed value by
adjusting the column output of `nvim_win_get_cursor`.

`blink.cmp` does not make this adjustment and directly passes the
(1,0)-indexed value from `nvim_win_get_cursor`.

Previously we did not handle this difference and would subtract 1 from
the column resulting in an exception due to negative values. The fix is
to account for this difference when adjusting the values to treesitter's
(0,0)-indexed APIs.

I'm not 100% sure why this did not crop up before while testing but
likely related to this note from the `0.11.0` release:

> [!IMPORTANT]
> Blink.cmp now fetches the completion items immediately upon entering
> insert mode by default. More ideas for prefetching are being explored!

So we still had the off by 1 column issue but since items were not being
pre-fetched and due to the trigger characters configuration the column
would always be > 0, so it would not error.

Author: MeanderingProgrammer

lua/render-markdown/health.lua

@@ -5,7 +5,7 @@ local state = require('render-markdown.state')
 local M = {}
 
 ---@private
-M.version = '7.8.10'
+M.version = '7.8.11'
 
 function M.check()
     M.start('version')

lua/render-markdown/integ/blink.lua

@@ -24,7 +24,9 @@ end
 ---@param context blink.cmp.Context
 ---@param callback fun(response?: blink.cmp.CompletionResponse)
 function Source:get_completions(context, callback)
-    local items = source.items(context.bufnr, context.cursor[1] - 1, context.cursor[2] - 1)
+    -- nvim_win_get_cursor: (1,0)-indexed
+    local cursor = context.cursor
+    local items = source.items(context.bufnr, cursor[1] - 1, cursor[2])
     if items == nil then
         callback(nil)
     else

lua/render-markdown/integ/cmp.lua

@@ -22,7 +22,10 @@ end
 ---@param callback fun(response?: lsp.CompletionItem[])
 function Source:complete(params, callback)
     local context = params.context
-    local items = source.items(context.bufnr, context.cursor.row - 1, context.cursor.col - 1)
+    -- nvim_win_get_cursor: (1,0)-indexed
+    -- nvim-cmp col + 1   : (1,1)-indexed
+    local cursor = context.cursor
+    local items = source.items(context.bufnr, cursor.row - 1, cursor.col - 1)
     callback(items)
 end
 

lua/render-markdown/integ/source.lua

@@ -23,8 +23,8 @@ function M.trigger_characters()
 end
 
 ---@param buf integer
----@param row integer
----@param col integer
+---@param row integer 0-indexed
+---@param col integer 0-indexed
 ---@return lsp.CompletionItem[]?
 function M.items(buf, row, col)
     local has_parser, parser = pcall(vim.treesitter.get_parser, buf)