Add borders and background to floating windows

LOG.md

@@ -9,6 +9,7 @@ Authoritative notes for the Neovim migration. Use this alongside `MIGRATION_PLAN
 
 Record every decision here with a short rationale. Append new entries; do not rewrite history.
 
+- 2025-01-13: **Popup borders for visibility**: Added rounded borders to all floating windows to prevent them from blending into the background. Changed `NormalFloat` and `FloatBorder` backgrounds from transparent (`c.NONE`) to `c.bg_ui` (slightly off-white) in colorscheme. Configured LSP handlers for hover and signature help to use `border = "rounded"`. Diagnostics already had borders configured. This provides clear visual separation between popups and main editor content.
 - 2025-01-13: **Git files to quickfix**: Added `<leader>gg` keymap to send all modified, deleted, and untracked Git files to quickfix list with status indicators. Uses `git status --porcelain` to parse file status (Modified, Deleted, Added, Untracked, etc.) and displays it in the quickfix text column. Implementation in `utils.git_changed_files()`. Complements existing `<leader>hq` (Gitsigns hunks to quickfix) with file-level Git status workflow.
 - 2025-01-12: **Custom Tabline Function**: Implemented configurable custom tabline to replace Neovim's hardcoded path shortening (e.g., `a/p/file.txt`). Function in `lua/utils.lua` allows controlling: (1) number of full parent directories via `utils.tabline_full_parents` (default: 1), and (2) shortening length via `utils.tabline_shorten_length` (default: 3 characters). Example: with defaults, `/path/to/my/project/src/file.txt` becomes `pat/to/my/project/src/file.txt`. User preference for seeing enough context in shortened paths while keeping tab width manageable.
 - 2025-12-06: PHP LSP = `intelephense` (good PHP ecosystem support; integrates includePaths).

lua/paper-tonic-modern/groups/editor.lua

@@ -9,8 +9,8 @@ return {
   -- ============================================================================
   
   Normal = { fg = c.fg, bg = c.bg },
-  NormalFloat = { fg = c.fg, bg = c.NONE },
-  FloatBorder = { fg = c.fg_stronger, bg = c.NONE },
+  NormalFloat = { fg = c.fg, bg = c.bg_ui },
+  FloatBorder = { fg = c.fg_weaker, bg = c.bg_ui },
   
   -- ============================================================================
   -- Cursor & Line Highlighting

lua/settings.lua

@@ -95,9 +95,55 @@ vim.diagnostic.config({
 	update_in_insert = false, -- Don't update diagnostics while typing
 	severity_sort = true, -- Sort by severity (errors first)
 	float = {
-		border = "rounded",
+		border = "single",
 		source = "always", -- Show diagnostic source
 		header = "",
 		prefix = "",
 	},
 })
+
+-- Configure LSP floating windows with borders and padding
+-- Custom border with box-drawing characters flush to window edges
+-- Using heavy/light box-drawing characters positioned at cell edges
+local border = {
+	{ "🭽", "FloatBorder" }, -- top-left corner
+	{ "▔", "FloatBorder" }, -- top horizontal line (at top edge)
+	{ "🭾", "FloatBorder" }, -- top-right corner
+	{ "▕", "FloatBorder" }, -- right vertical line (at right edge)
+	{ "🭿", "FloatBorder" }, -- bottom-right corner
+	{ "▁", "FloatBorder" }, -- bottom horizontal line (at bottom edge)
+	{ "🭼", "FloatBorder" }, -- bottom-left corner
+	{ "▏", "FloatBorder" }, -- left vertical line (at left edge)
+}
+
+-- Override the default open_floating_preview to add padding by modifying content
+local orig_util_open_floating_preview = vim.lsp.util.open_floating_preview
+function vim.lsp.util.open_floating_preview(contents, syntax, opts, ...)
+	opts = opts or {}
+	opts.border = opts.border or border
+	
+	-- Add padding by wrapping content with empty lines and spacing
+	if type(contents) == "table" and #contents > 0 then
+		-- Add empty lines at top and bottom
+		table.insert(contents, 1, "")
+		table.insert(contents, 1, "")
+		table.insert(contents, "")
+		table.insert(contents, "")
+		
+		-- Add horizontal padding (spaces) to each content line
+		for i = 3, #contents - 2 do
+			if type(contents[i]) == "string" then
+				contents[i] = "  " .. contents[i] .. "  "
+			end
+		end
+	end
+	
+	return orig_util_open_floating_preview(contents, syntax, opts, ...)
+end
+
+vim.lsp.handlers["textDocument/hover"] = vim.lsp.with(vim.lsp.handlers.hover, {
+	border = border,
+})
+vim.lsp.handlers["textDocument/signatureHelp"] = vim.lsp.with(vim.lsp.handlers.signature_help, {
+	border = border,
+})