Remove Avante leftovers from blink.cmp config

Avante was removed in c26b6c9 but blink-cmp-avante stayed as a dependency and
"avante" stayed first in sources.default, so the provider still loaded at
startup. Restore `keymap = { preset = "super-tab" }` now that LazyVim#6183 has
shipped; the workaround called require() during spec evaluation, which pulled
blink.cmp into startup.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

lua/plugins/blink.lua

@@ -1,8 +1,6 @@
 return {
   "saghen/blink.cmp",
   dependencies = {
-    -- For auto-completion in the avante window
-    "Kaiser-Yang/blink-cmp-avante",
     -- For emoji selection
     "moyiz/blink-emoji.nvim",
   },
@@ -12,26 +10,10 @@ return {
         show_in_snippet = false,
       },
     },
-    -- use preset again once this is merged: https://github.com/LazyVim/LazyVim/pull/6183
-    -- keymap = { preset = "super-tab" },
-    keymap = {
-      ["<Tab>"] = {
-        require("blink.cmp.keymap.presets").get("super-tab")["<Tab>"][1],
-        require("lazyvim.util").cmp.map({ "snippet_forward", "ai_accept" }),
-        "fallback",
-      },
-    },
+    keymap = { preset = "super-tab" },
     sources = {
-      -- Add 'avante' to the list
-      default = { "avante", "lsp", "path", "snippets", "buffer", "emoji" },
+      default = { "lsp", "path", "snippets", "buffer", "emoji" },
       providers = {
-        avante = {
-          module = "blink-cmp-avante",
-          name = "Avante",
-          opts = {
-            -- options for blink-cmp-avante
-          },
-        },
         emoji = {
           module = "blink-emoji",
           name = "Emoji",