feat(neovim): Show codelens virtual text for implementations

- Rust: `rust-analyzer` enable `lens`
- Rust: Refresh lens on LspAttach and subsequently on rust buffers
- Use `LspSaga` for all other lsp types to show codelens

common/.config/nvim/after/ftplugin/rust.lua

@@ -7,8 +7,26 @@ if pcall(require, "rustaceanvim") then
     vim.keymap.set("n", "<leader>rh", "<cmd>RustLsp openDocs<cr>", { desc = "Open docs.rs Documentation" })
     vim.keymap.set("n", "<leader>rM", "<cmd>RustLsp view mir<cr>", { desc = "View Mid-Level IR", buffer = bufnr })
     vim.keymap.set("n", "<leader>rH", "<cmd>RustLsp view hir<cr>", { desc = "View High-Level IR", buffer = bufnr })
+    vim.keymap.set("n", "<leader>rL", vim.lsp.codelens.refresh, { desc = "Run CodeLens" })
 end
 
+vim.api.nvim_create_autocmd("LspAttach", {
+    callback = function(event)
+        local client = vim.lsp.get_client_by_id(event.data.client_id)
+        if not client or client.name ~= "rust-analyzer" then
+            return
+        end
+
+        pcall(vim.lsp.codelens.refresh)
+
+        -- Setup ongoing refresh triggers
+        vim.api.nvim_create_autocmd({ "InsertLeave", "BufWritePost", "BufEnter" }, {
+            buffer = event.buf,
+            callback = vim.lsp.codelens.refresh,
+        })
+    end,
+})
+
 local function run_tests_with_coverage()
     -- Run tests through neotest
     require("neotest").run.run(vim.fn.expand("%"))

common/.config/nvim/lua/plugins/code-generic.lua

@@ -156,12 +156,16 @@ return {
                 ui = {
                     -- kind = require("config.util").icons.kind_lspsaga,
                     kind = require("catppuccin.groups.integrations.lsp_saga").custom_kind(),
+                    devicon = true,
+                    title = true,
                 },
-                implement = { enabled = true },
-                symbol_in_winbar = {
+                implement = {
                     enable = true,
-                    hide_keyword = true,
+                    virtual_text = true,
+                    sign = true,
+                    priority = 100,
                 },
+                symbol_in_winbar = { enable = true, hide_keyword = true },
                 lightbulb = { virtual_text = false },
                 outline = { auto_preview = false },
             })

common/.config/nvim/lua/plugins/code-lsp.lua

@@ -94,6 +94,10 @@ return {
                                 postfix = { enable = true },
                                 autoimport = { enable = true },
                             },
+                            lens = {
+                                enable = true,
+                                implementations = { enable = true },
+                                run = { enable = false },
                             },
                             inlayHints = {
                                 bindingModeHints = { enable = false },
@@ -124,6 +128,7 @@ return {
                             },
                         },
                     },
+                },
                 dap = {
                     adapter = {
                         type = "executable",