fix(neovim): Rust test-coverage plugin & coding qol improvements

- Rust: `nvim-coverage` for generating code-coverage report
- Rust: Keymaps & nvim-job for test-coverage report display
- Coding-QOL: Remove distracting & noisy diagnostic virtual-line
- Coding-QOL: Keymaps to disable diagnostic virtual text
- Coding-QOL: Disable diagnostic underlines
- Fix: Disable telescope `hightlight` to fix frequent crash
- Coding-QOL: Telescope Keymaps to move between loops
- Coding-QOL: Disable auto fn doc hover through `blink`; `LSPSaga` does
  it better
- Coding-QOL: Adding back `quick-scope` with proper config
- Keymap: Use `ctrl-p` to search files; same as vscode

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

@@ -8,3 +8,23 @@ if pcall(require, "rustaceanvim") then
     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 })
 end
+
+local function run_tests_with_coverage()
+    -- Run tests through neotest
+    require("neotest").run.run(vim.fn.expand("%"))
+
+    -- Generate coverage after tests complete
+    vim.fn.jobstart("cargo llvm-cov --lcov --output-path coverage.lcov", {
+        on_exit = function(_, code)
+            if code == 0 then
+                -- Load coverage data
+                require("coverage").load(true)
+                print("Coverage updated")
+            else
+                print("Coverage generation failed")
+            end
+        end,
+    })
+end
+
+vim.keymap.set("n", "<leader>tc", run_tests_with_coverage, { desc = "Test: Run tests with coverage" })