feat: link each changelog entry to its PR and commit (#11)

Like Immich's and RomM's release notes: every changelog entry now links to its pull request and its commit, in `CHANGELOG.md` and in the release notes on Gitea:

```
- Search with fzf's scoring and query syntax ([#11](…/pulls/11)) ([65dc2d7](…/commit/65dc2d7…))
```

- `cliff.toml`: the entry template adds the short commit hash as a link; a postprocessor turns the squash commit's `(#N)` into a link to the PR.
- The app shows release notes as text (`U`, and the status pane's changelog to come), so `Release.Notes()` turns Markdown links back into their text: `Search (#11) (65dc2d7)`.

Checked with `git cliff --unreleased` on main: every entry since v0.1.0 gets both links. Test for the link stripping.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Karl-Einar Bergstrøm <karl-einarb@outlook.com>
Reviewed-on: #11

internal/ui/keys/keys.go

@@ -37,7 +37,7 @@ type Map struct {
 	// lists
 	Up, Down, Top, Bottom             key.Binding
 	NextPane, PrevPane                key.Binding
-	Pane1, Pane2, Pane3, Pane4        key.Binding
+	Pane0, Pane1, Pane2, Pane3, Pane4 key.Binding
 	NextTab, PrevTab                  key.Binding
 	Enter, Back, Filter               key.Binding
 	Reveal, Copy, CopyRef, Open, Edit key.Binding
@@ -92,6 +92,7 @@ func (m *Map) Actions() []Action {
 		a(Lists, "pane2", &m.Pane2, "Vaults pane", "move", "Focus the Vaults (or Scopes) pane."),
 		a(Lists, "pane3", &m.Pane3, "Secrets pane", "move", "Focus the Secrets pane."),
 		a(Lists, "pane4", &m.Pane4, "detail pane", "move", "Focus the detail pane."),
+		a(Lists, "pane0", &m.Pane0, "status", "move", "Focus the status pane: version and updates, accounts, config files, links and the changelog, on the right."),
 		a(Lists, "enter", &m.Enter, "open", "move", "Go into the selected item: from a subscription to its vaults, from a vault to its secrets. On a provider header, fold or unfold it."),
 		a(Lists, "back", &m.Back, "back", "move", "Go back: clear an applied filter, leave the versions view, or focus the previous pane."),
 
@@ -178,7 +179,7 @@ var defaults = map[string][]string{
 	"lists.up": {"k", "up", "ctrl+k", "ctrl+p"}, "lists.down": {"j", "down", "ctrl+j", "ctrl+n"},
 	"lists.top": {"g", "home"}, "lists.bottom": {"G", "end"},
 	"lists.nextPane": {"tab", "l", "right"}, "lists.prevPane": {"shift+tab", "h", "left"},
-	"lists.pane1": {"1"}, "lists.pane2": {"2"}, "lists.pane3": {"3"}, "lists.pane4": {"4"},
+	"lists.pane1": {"1"}, "lists.pane2": {"2"}, "lists.pane3": {"3"}, "lists.pane4": {"4"}, "lists.pane0": {"0"},
 	"lists.enter": {"enter"}, "lists.back": {"esc", "backspace"},
 	"lists.filter": {"/"}, "lists.prevTab": {"["}, "lists.nextTab": {"]"}, "lists.sourcesView": {"`"},
 	"lists.star": {"f"}, "lists.favourites": {"F"}, "lists.recent": {"R"}, "lists.search": {"ctrl+s"}, "lists.note": {"n"},