feat: add scramble flag for development text scrambling

This commit introduces a new scramble option to help reduce distractions
during development by scrambling text using rot13. When enabled via the
new `--scramble` flag, text displayed in various views is transformed,
making it easier to focus on layout and behavior without reading the
actual content.

App & Args Updates

  - Added a `scramble: bool` field to the main application state (in `app.rs`).

  - Extended argument parsing (in `args.rs`) to recognize the `--scramble` flag.

NoteOptions Enhancement

  - Introduced a new bit flag `scramble_text` in `NoteOptions` with
    corresponding setter/getter methods.

UI Adjustments

  - Propagated the scramble flag through note rendering functions across
    navigation, timeline, and note view modules.

  - Updated several UI components (e.g., in `nav.rs`, `route.rs`, and
    `contents.rs`) to accept and apply the new note options.

Rot13 Implementation

  - Implemented a helper function (`rot13`) to scramble text
    conditionally when the scramble option is enabled.

This feature is intended for development builds only, offering a way to
obscure text content during UI tweaks and testing.

Signed-off-by: William Casarin <jb55@jb55.com>

crates/notedeck_columns/src/ui/note/post.rs

@@ -4,7 +4,7 @@ use crate::media_upload::{nostrbuild_nip96_upload, MediaPath};
 use crate::post::{downcast_post_buffer, MentionType, NewPost};
 use crate::profile::get_display_name;
 use crate::ui::search_results::SearchResultsView;
-use crate::ui::{self, Preview, PreviewConfig};
+use crate::ui::{self, note::NoteOptions, Preview, PreviewConfig};
 use crate::Result;
 use egui::text::{CCursorRange, LayoutJob};
 use egui::text_edit::TextEditOutput;
@@ -27,6 +27,7 @@ pub struct PostView<'a> {
     poster: FilledKeypair<'a>,
     id_source: Option<egui::Id>,
     inner_rect: egui::Rect,
+    note_options: NoteOptions,
 }
 
 #[derive(Clone)]
@@ -82,6 +83,7 @@ pub struct PostResponse {
 }
 
 impl<'a> PostView<'a> {
+    #[allow(clippy::too_many_arguments)]
     pub fn new(
         ndb: &'a Ndb,
         draft: &'a mut Draft,
@@ -90,6 +92,7 @@ impl<'a> PostView<'a> {
         note_cache: &'a mut NoteCache,
         poster: FilledKeypair<'a>,
         inner_rect: egui::Rect,
+        note_options: NoteOptions,
     ) -> Self {
         let id_source: Option<egui::Id> = None;
         PostView {
@@ -101,6 +104,7 @@ impl<'a> PostView<'a> {
             id_source,
             post_type,
             inner_rect,
+            note_options,
         }
     }
 
@@ -302,6 +306,7 @@ impl<'a> PostView<'a> {
                                         txn,
                                         id.bytes(),
                                         nostrdb::NoteKey::new(0),
+                                        self.note_options,
                                     );
                                 });
                             });
@@ -686,6 +691,7 @@ mod preview {
                 app.note_cache,
                 self.poster.to_filled(),
                 ui.available_rect_before_wrap(),
+                NoteOptions::default(),
             )
             .ui(&txn, ui);
         }