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

cmd/lazysecrets/main.go

@@ -369,6 +369,8 @@ Flags:
 		Version:        versionString(),
 		Store:          st,
 		CacheFile:      cacheFile,
+		ConfigFiles:    configFiles(*configPath),
+		StatePath:      statePath,
 		Dir:            placeDir,
 		Open:           open,
 		Styles:         &theme,
@@ -381,3 +383,22 @@ Flags:
 	}
 	return err
 }
+
+// configFiles are the config files given, for the status pane: those
+// that exist, or the first if none does (where to create one).
+func configFiles(list string) []string {
+	var all, found []string
+	for _, f := range strings.Split(list, ",") {
+		if f = strings.TrimSpace(f); f == "" {
+			continue
+		}
+		all = append(all, f)
+		if _, err := os.Stat(f); err == nil {
+			found = append(found, f)
+		}
+	}
+	if len(found) == 0 && len(all) > 0 {
+		return all[:1]
+	}
+	return found
+}