Merge branch 'feature/qaction-menus'

Menus, a toolbar and a generated shortcut reference, built on converting
the action registry from a hash of callbacks to QActions. Along the way:
three default key bindings that had never fired, a shortcut dialog taller
than the screen, thread list columns that could not be resized, no visible
feedback that a tag action had landed, and a tags column so wide it was
unreadable.

Backlog items 3, 8, 9, 13 and 14 done; 11 partly.

1 files changed, 60 insertions, 1 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 90853ce..c78cb94 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,7 +11,66 @@ point at which they are stable.
 
 ## [Unreleased]
 
-Nothing yet.
+### Added
+
+- Tags render as coloured chips instead of text in a column. The account tag
+  sits in front of the subject in the thread list, and the functional tags fill
+  a single row under the message pane, with anything that does not fit
+  collapsing into a `+N` chip whose tooltip names the rest.
+- `[tagcolors]` config group. Colours resolve by exact tag first, then by
+  top-level prefix, so one `shopping` entry covers `shopping/amazon` and
+  `shopping/nike` while `shopping/amazon` can still override its own. Built-in
+  defaults cover the usual state tags; anything unconfigured gets a stable
+  colour derived from its name.
+- `color` and `label` keys in an account stanza, setting the account chip's
+  fill and its text. `label` shortens a long key for display only and renames
+  nothing in notmuch; unset falls back to the key.
+- The application icon is now used: window icon, a `.desktop` entry, and
+  install rules placing both into `hicolor` and `share/applications`.
+- Toolbar and menu actions carry icons from the system theme, falling back to
+  text where a theme lacks one.
+- Menu bar covering every action: File, Edit, Message, View and Help.
+- Toolbar with the frequent subset, Sync, Archive, Delete and Undo.
+- **Help > Keyboard shortcuts**, listing the current bindings. Generated from
+  the actions themselves, so it shows configured overrides rather than a
+  hand-written copy of the defaults.
+- **Help > About**.
+- Default bindings for `spam` and `load_remote`, which previously had none
+  and were unreachable until bound by hand.
+
+### Fixed
+
+- Acting on a thread now visibly changes its row. A thread tagged `deleted`
+  or `spam` is filled dark red or orange, in white struck-through text, across
+  every column. The tag change was already applied, but `Tags` sat after the
+  stretching `Subject` column and was pushed off-screen, so Delete looked like
+  it had done nothing.
+- Thread list columns are Date, From and Subject, all resizable. The tags
+  column is gone: spelling out a dozen tags per row consumed most of the list's
+  width. Widening past the viewport scrolls horizontally rather than squeezing
+  the other columns.
+- Hierarchical tags in `[tagcolors]` were silently ignored. QSettings treats
+  `/` in a key as a group separator, so `shopping/amazon` becomes a nested key
+  that `childKeys()` never returns, and every tag containing a `/` fell through
+  to its prefix.
+- Three default bindings never fired. Typing a capital sends `Shift`+the key,
+  but `N`, `F` and `G` were stored as the unshifted key, which no keystroke
+  produces, leaving `toggle_unread`, `flag` and `sync` dead. A bare capital in
+  `[keys]` is now read as `Shift`+that letter. As a side effect `y` and `Y`
+  are two distinct keys rather than a collision that silently dropped one.
+- Modifier shortcuts such as `Ctrl+Q` now work while the query bar has focus.
+  The old event filter suppressed every binding there, not only the plain
+  letters that would have interfered with typing.
+
+### Changed
+
+- Default bindings moved to modifier shortcuts (`Ctrl+E` archive, `Ctrl+D`
+  delete, and so on). Existing `[keys]` entries are unaffected, and single
+  letters are still safe to bind. See "Upgrading from 0.1.0" in the README.
+- Actions are `QAction`s dispatched by shortcut rather than a hash of
+  callbacks behind an event filter, which is what lets them appear in menus.
+  The hand-maintained list of registered action names is now derived from the
+  actions, so it can no longer drift from them.
 
 ## [0.1.0] - 2026-08-03