Add project-mode tooling: characters, outline, diff and revision status

Rounds out project mode, where the workspace is the project root and one
subfolder holds the manuscript proper:

- Characters and Outline windows, backed by new `characters` and `outline`
  modules that read the cast from character sheets and measure how much of
  the snowflake outline is actually written.
- Edit ▸ Changes… diffs the open file against its last committed version.
- Revision status, per-file and project word counts, an archive action and
  hidden folders in the file panel.
- Chapter-file export alongside the ODT master, richer header parsing, and
  a project word list for names and invented terms.
- The export path now follows the workspace: opening a project points it at
  that project root, keeping a file name you chose yourself and re-deriving
  one that merely echoed the folder it sat in.
- Clicking an issue in the grammar/spelling panel takes the editor to it,
  selecting the words and centring them; applying a suggestion jumps to the
  rewritten text as well.

README covers the new windows and workflows.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017bSn3Xijp8GofZVUnRX4oq

src/app/mod.rs

@@ -16,9 +16,12 @@ use std::time::{Duration, Instant};
 
 mod autocomplete;
 mod beats;
+mod characters;
+mod diff;
 mod editor;
 mod file_list;
 mod find;
+mod outline;
 mod project;
 mod grammar;
 mod spelling;
@@ -33,6 +36,7 @@ use self::autocomplete::*;
 use self::file_list::*;
 use self::grammar::*;
 use self::project::*;
+use self::spelling::*;
 use self::style::*;
 use self::util::*;
 
@@ -70,6 +74,8 @@ struct FileMeta {
     goal: Option<crate::preprocess::WordGoal>,
     /// Prose (body) word count captured with the rest of this metadata.
     prose_words: usize,
+    /// The `Status:` line, if any — the revision stage this file has reached.
+    status: Option<String>,
 }
 
 impl FileMeta {
@@ -81,14 +87,10 @@ impl FileMeta {
             pov: h.pov,
             goal: h.goal,
             prose_words: count_words(&h.body),
+            status: crate::preprocess::field(text, marker, "Status"),
         }
     }
 
-    /// Whether this entry carries anything worth caching/showing.
-    fn has_display(&self) -> bool {
-        self.slug.is_some() || self.pov.is_some() || self.goal.is_some()
-    }
-
     /// The tooltip text — a `POV:` line then the slug synopsis — or `None` when
     /// the file carries neither field.
     fn tooltip(&self) -> Option<String> {
@@ -163,6 +165,10 @@ struct IssueItem {
 
 pub struct App {
     config: Config,
+    /// The manuscript folder within the workspace when the workspace is a
+    /// project root — files under it are the book, everything else is
+    /// reference. `None` when the workspace is itself the manuscript.
+    manuscript_dir: Option<String>,
     /// Ordered markdown files, as workspace-relative paths with `/` separators
     /// (`part-1/ch-03.md`). Always held in folder-tree order — see
     /// [`crate::order::tree_order`] — so this list reads exactly as the file
@@ -177,8 +183,11 @@ pub struct App {
     /// Editing buffer for the selected file's chapter title override.
     title_input: String,
     selected: Option<usize>,
-    /// Editor contents for the selected file.
+    /// Editor contents for the selected file. While the header is collapsed
+    /// this is the prose only; [`App::document`] puts the file back together.
     buffer: String,
+    /// The editorial header lifted out of `buffer` while it is collapsed.
+    header_stash: Option<String>,
     dirty: bool,
     /// Editable copy of the workspace path shown in the top bar.
     workspace_input: String,
@@ -268,9 +277,33 @@ pub struct App {
     spell_rx: Option<std::sync::mpsc::Receiver<SpellCheckMsg>>,
     /// One-line status for the spell checker (dictionary name, count, or error).
     spell_status: String,
+    /// Names and invented terms the checker accepts on top of the dictionary,
+    /// loaded from the workspace's `wordlist.json`.
+    wordlist: crate::spell::WordList,
+    /// Whether the word-list window is open.
+    show_wordlist: bool,
+    /// When set, the file panel shows only files whose `Status:` matches.
+    status_filter: Option<String>,
+    /// The project's cast, read from its character sheets.
+    characters: Vec<crate::characters::Character>,
+    /// Whether the Characters window is open.
+    show_characters: bool,
+    /// Whether the manuscript-details window is open.
+    show_manuscript_settings: bool,
+    /// Whether the Outline window is open.
+    show_outline: bool,
+    /// Whether the diff window is open, and what it is showing.
+    show_diff: bool,
+    diff_text: String,
+    diff_title: String,
+    /// Text field for adding a word by hand.
+    wordlist_input: String,
     /// Index (into the currently displayed matches) of the word a right-click
     /// suggestion menu is open for, if any.
     spell_menu: Option<usize>,
+    /// Byte range in `buffer` the editor should select and scroll into view next
+    /// frame, set when an issue is clicked in the results panel.
+    issue_jump: Option<(usize, usize)>,
     /// Whether the Mistral settings window is open.
     show_mistral_settings: bool,
     /// Whether the new-file template settings window is open.
@@ -312,12 +345,14 @@ impl App {
             workspace_input: config.workspace.display().to_string(),
             export_input: config.export_path.display().to_string(),
             config,
+            manuscript_dir: None,
             files: Vec::new(),
             collapsed: HashSet::new(),
             titles: HashMap::new(),
             title_input: String::new(),
             selected: None,
             buffer: String::new(),
+            header_stash: None,
             dirty: false,
             new_name: String::new(),
             rename_input: String::new(),
@@ -360,7 +395,19 @@ impl App {
             spell_last_edit: None,
             spell_rx: None,
             spell_status: String::new(),
+            wordlist: crate::spell::WordList::default(),
+            show_wordlist: false,
+            status_filter: None,
+            characters: Vec::new(),
+            show_characters: false,
+            show_manuscript_settings: false,
+            show_outline: false,
+            show_diff: false,
+            diff_text: String::new(),
+            diff_title: String::new(),
+            wordlist_input: String::new(),
             spell_menu: None,
+            issue_jump: None,
             show_mistral_settings: false,
             show_template_settings: false,
             beats_rx: None,
@@ -471,6 +518,26 @@ impl eframe::App for App {
             self.beats_window(ctx);
         }
 
+        if self.show_wordlist {
+            self.wordlist_window(ctx);
+        }
+
+        if self.show_characters {
+            self.characters_window(ctx);
+        }
+
+        if self.show_manuscript_settings {
+            self.manuscript_settings_window(ctx);
+        }
+
+        if self.show_outline {
+            self.outline_window(ctx);
+        }
+
+        if self.show_diff {
+            self.diff_window(ctx);
+        }
+
         if self.show_cheatsheet {
             crate::help::cheatsheet_window(ctx, &mut self.show_cheatsheet);
         }