feat: Konsole parity phase 1 (save output, search options, monitors, profile CLI)

Implements the first batch of COSMIC_TERMINAL_KONSOLE_PARITY.md:

Save output as text:
- New SaveOutput action in the Edit menu, terminal context menu and
  keyboard shortcuts (Ctrl+Shift+S, Konsole parity, rebindable).
- Terminal::scrollback_text() extracts history plus visible screen via
  alacritty bounds_to_string, trimming trailing empty lines.
- Save-file dialog through cosmic-files; the file is written in a
  spawn_blocking task so large scrollbacks never stall the UI.

Search options:
- Case-sensitive and regex checkboxes in the find bar.
- App::find_pattern() escapes the pattern when regex mode is off and
  prefixes (?i) when case-insensitive (same approach as Alacritty).

Per-tab monitors (activity / silence / process finished):
- Toggles in the View menu and terminal context menu, state stored in
  Terminal (monitor_* fields).
- Activity alerts on PTY output (Wakeup) for non-active tabs; silence
  alerts after 10 s without output (Konsole default); process-finished
  compares the shell pgrp with the tty tpgid via /proc/<pid>/stat and
  alerts when the foreground job exits.
- Silence and process checks run on a 1 s iced::time subscription that
  is only active while at least one tab needs it.
- Tab bar shows an armed icon (view-reveal-symbolic) and per-kind alert
  icons; activating the tab acknowledges the alert.

Profile CLI:
- --profile/-p <name-or-id> applies a profile to the first tab only,
  unknown profiles exit(1) with the available list on stderr.
- --list-profiles prints "id<TAB>name" and exits.
- Config is now loaded before the daemonize fork so CLI output reaches
  the launching terminal.
- --help now documents -e/--command, --no-daemon and the new flags
  (-e already worked; audit confirmed everything after it becomes the
  command and its arguments).

i18n: new en/fr strings (save-output, monitor-*, find-case-sensitive,
find-regex).

Validated with ./check_cosmic_local.sh terminal, cargo fmt, and a debug
build exercising the CLI flags and a 6 s live run. The shutdown panic
in iced_winit ("async fn resumed after completion") pre-exists and is
reproducible with the installed binary.

Leyoda 2026 – GPLv3

i18n/en/cosmic_term.ftl

@@ -104,6 +104,8 @@ type-to-search = Type to search...
 find-placeholder = Find...
 find-previous = Find previous
 find-next = Find next
+find-case-sensitive = Case sensitive
+find-regex = Regex
 
 # Menu
 
@@ -123,6 +125,12 @@ paste = Paste
 select-all = Select all
 find = Find
 clear-scrollback = Clear scrollback
+save-output = Save output as text...
+
+## Monitors
+monitor-activity = Monitor for activity
+monitor-silence = Monitor for silence
+monitor-process-finished = Monitor for process finishing
 
 ## Open
 open-link = Open Link

i18n/fr/cosmic_term.ftl

@@ -72,6 +72,8 @@ show-header-description = Révéler l'en-tête du menu contextuel
 find-placeholder = Rechercher...
 find-previous = Chercher précédent
 find-next = Chercher prochain
+find-case-sensitive = Respecter la casse
+find-regex = Regex
 
 # Menu
 
@@ -94,6 +96,12 @@ paste = Coller
 select-all = Sélectionner tout
 find = Rechercher
 clear-scrollback = Effacer l'historique
+save-output = Enregistrer la sortie comme texte...
+
+## Monitors
+monitor-activity = Surveiller l'activité
+monitor-silence = Surveiller le silence
+monitor-process-finished = Surveiller la fin du processus
 
 ## View