Copy-mode with scrollback search + config hot-reload

- alt+c enters copy-mode on the focused terminal: arrows/PgUp/PgDn/
  Home/End scroll the history, / searches (matches highlighted in the
  view), n/N jump between hits, q/Esc exits back to the bottom.
  Status line shows position and key help
- config.toml, panel files and the theme file are watched (1s mtime
  poll): edits reload theme/panels/keybinds live without restarting —
  windows and focus are untouched
- Integration suite runs the daemon in an isolated config dir and
  covers copy-mode search and panel hot-reload — 27/27 passing

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

config.toml

@@ -77,6 +77,14 @@ scope = "global"
 label = "Maximera/återställ"
 action = { type = "maximize" }
 
+# Copy-mode: bläddra/söka i fokuserat fönsters historik med tangentbordet
+# (↑↓/PgUp/PgDn bläddrar, / söker, n/N hoppar mellan träffar, q stänger)
+[[keybind]]
+key = "alt+c"
+scope = "global"
+label = "Copy-mode (sök i historik)"
+action = { type = "copy_mode" }
+
 # Avsluta TUI-WM när skrivbordet är fokuserat
 [[keybind]]
 key = "ctrl+q"