feat: buffer-rendered control bar, emoji icons, fix IP sign leak

Addresses live-feedback issues that persisted after v3:

- Control bar now uses buffer content + extmarks instead of winbar —
  winbar doesn't render in minimal-style floats, which is why the bar
  was empty. Two rows: ─ separator on top, state chip + controls below.
  Click dispatch via buffer-local <LeftMouse> keymap + cursor-column
  lookup against a zones table.
- Bar auto-refreshes on every dap event (initialized/stopped/continued/
  terminated/exited) so the READY/RUNNING/PAUSED chip and dap.status()
  text stay live.
- Colorful emoji throughout for instant recognition:
    Signs:    🔴 BP, 🟡 conditional, ⭕ rejected, 👉 stopped, 📝 logpoint
    Titles:   🔎 Scopes, 👁️ Watches, 📚 Call Stack, 🔴 Breakpoints,
              💻 Console, 💬 REPL
    Badge:    🐛 DEBUG · <file>
    Controls: ▶️ ⏭️ ⬇️ ⬆️ 🔄 🛑 ❌
- Modal key install no longer skips buffers that already have entries —
  every BufEnter/FileType force-reinstalls the keymaps so dapui's own
  render pass can't leave them in a broken state.
- IP sign leak fixed: clear_ip() now unplaces lingering DapStopped signs
  via sign_getplaced + sign_unplace, so restart no longer leaves a stale
  👉 in the gutter of the previously-paused line.
- IP reason text (STEP/BREAKPOINT/EXCEPTION) now uses bold + reverse for
  an inverted-color badge that really demands attention.
- dapui.expand_lines = false — this was spawning a cursor-pinned float
  when a line was wider than its pane, causing the "hover text bleeds
  across the screen" bug. With wrap+breakindent inside the pane, the
  hover-float is redundant and destructive.
- Control-bar buffer is marked filetype=TurboDebugBar and explicitly
  skipped by the modal key installer, so clicking a button doesn't
  accidentally fire modal actions.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lua/turbo-debug/config.lua

@@ -80,6 +80,12 @@ M.defaults = {
     },
     floating = { border = "rounded", mappings = { close = { "q", "<Esc>" } } },
     render = { indent = 2, max_type_length = 20 },
+    -- dapui's `expand_lines` spawns a cursor-pinned floating window when a
+    -- line is longer than the pane width — that float bleeds across the
+    -- entire screen for long register dumps. We wrap inside the pane instead
+    -- (wrap=true + breakindent + showbreak in set_dapui_window_opts), so this
+    -- hover is both redundant and destructive. Kill it.
+    expand_lines = false,
     -- layouts are built dynamically from `sidebar` in mode.lua; override
     -- `layouts` here to fully customize.
     layouts = nil,