config: add web_theme/web_port fields

Add WebTheme (default: "transfiguration") and WebPort (default: 0) to Config
for the upcoming lectio-web binary. WebTheme resolves theme names (built-in
or user files) later in internal/web; WebPort 0 means auto-pick a free port.

- Updated Config struct with new fields
- Set defaults in Default()
- Updated embedded seed config.toml with documentation
- Added TDD tests: TestWebDefaults and TestWebLoadsFromSeed
- Existing tests (TestLoadSeeds, TestLoadOverride) still pass

1 files changed, 4 insertions, 0 deletions

diff --git a/internal/config/config.go b/internal/config/config.go
index 4e11c56..9c3c3cd 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -40,6 +40,8 @@ type Config struct {
 	Width           int                        `toml:"width"`
 	All             bool                       `toml:"all"`
 	Offline         bool                       `toml:"offline"`
+	WebTheme        string                     `toml:"web_theme"`
+	WebPort         int                        `toml:"web_port"`
 	Parts           map[string]map[string]bool `toml:"parts"`
 }
 
@@ -65,6 +67,8 @@ func Default() Config {
 		Width:           0,
 		All:             false,
 		Offline:         false,
+		WebTheme:        "transfiguration",
+		WebPort:         0,
 		Parts:           nil,
 	}
 }