Release 0.4.0: GUI design pass + td:/rem:/note:/q: prefix grammar

Unifies the "selected" visual language across breadman's sidebar and
breadpad's type chips (ghost default, solid accent when active), gives
note cards a real surface instead of just a left border, caps the note
list width so type chips and action buttons sit next to the title they
belong to, and swaps the sidebar's full-color emoji for theme-safe
monochrome glyphs plus per-type colored dots.

breadman also gets live per-row sidebar counts, a note-count footer,
relative timestamps with absolute-time tooltips, and a de-emphasized
Errors row.

breadpad's popup gets an explicit short-prefix grammar (td:, rem:,
idea:, note:, q:) that live-highlights the matching chip as you type,
a keyboard-shortcut hint row, and a confirm button that's visually
separated from the chip row instead of reading as a sixth pill.

Cargo.toml

@@ -8,7 +8,7 @@ members = [
 resolver = "2"
 
 [workspace.package]
-version = "0.3.4"
+version = "0.4.0"
 edition = "2021"
 license = "MIT"
 authors = ["Breadway"]