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.toml

@@ -24,6 +24,10 @@ ureq = { version = "2", default-features = false, features = ["tls"] }
 spellbook = "0.4.2"
 # Templating engine for project scaffolding (replaces cookiecutter dependency)
 minijinja = { version = "2", features = ["builtins", "loader"] }
+# Embeds the bundled project template (templates/snowflake) into the binary
+# at compile time, so New project… never depends on files installed beside
+# the executable.
+include_dir = "0.7.4"
 
 [profile.release]
 opt-level = 2