Bundle the project template into the binary; add outline-to-draft

links, a sprint timer, placeholder scanning, corkboard, and a
quick-capture inbox

- Compile templates/snowflake into the binary via include_dir, so New
  project… never depends on files installed beside the executable;
  Settings ▸ Template becomes an optional external override, and a
  broken saved override now falls back to the bundled template
  instead of failing project generation.
- Outline beats now link to a matching chapter for a one-click jump.
- Sprint window: a daily whole-manuscript word goal plus a
  Pomodoro-style writing sprint timer, with a compact countdown in the
  status bar while in Distraction-free mode.
- Placeholders window: find [TODO]/[TK]/[FIXME]/[XXX]/[NOTE]/[???]
  markers left in the draft and jump straight to any of them.
- Snowflake progress strip in the file panel: a nudge-only readout of
  which snowflake stage folders actually have content.
- Corkboard window: drag-reorderable synopsis cards, one per chapter.
- Quick-capture popup (Ctrl+Shift+N): jot a stray idea straight into
  the project's Scratch Pad without losing your place in the draft.

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

Cargo.lock

@@ -1659,6 +1659,25 @@ dependencies = [
  "arrayvec",
 ]
 
+[[package]]
+name = "include_dir"
+version = "0.7.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "923d117408f1e49d914f1a379a309cffe4f18c05cf4e3d12e613a15fc81bd0dd"
+dependencies = [
+ "include_dir_macros",
+]
+
+[[package]]
+name = "include_dir_macros"
+version = "0.7.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7cab85a7ed0bd5f0e76d93846e0147172bed2e2d3f859bcc33a8d9699cad1a75"
+dependencies = [
+ "proc-macro2",
+ "quote",
+]
+
 [[package]]
 name = "indexmap"
 version = "2.14.0"
@@ -1854,6 +1873,7 @@ dependencies = [
  "dirs",
  "eframe",
  "egui",
+ "include_dir",
  "minijinja",
  "pulldown-cmark",
  "rfd",