refactor: remove cached AppConfig pointer and read configuration directly from DB

Replace in-memory atomic AppConfig caching with direct DB queries via db.GetConfig
across application and page layers. This simplifies state management and ensures
all components always operate on the latest persisted configuration.

Key changes:
- Remove Application.Config atomic cache and refreshCache mechanism
- Eliminate PageCtx.CfgPtr and pass DB handle instead
- Replace all cfg reads with db.GetConfig(app.DB)
- Update mixer, audio, UI pages, and initialization paths accordingly
- Explicitly set AppConfig table name to avoid GORM pluralization issues
- Reduce DB connection pooling (SetMaxIdleConns(1))
- Standardize application font to SpaceMonoNerdFont-Regular
- Lower default audio volume (1.0 → 0.2)
- Add Unicode checkmark glyph to font map

Behavioral impact:
- Configuration is no longer cached in memory
- Every config access now hits the DB (more consistent, slightly more overhead)

internal/page/wifiSetupPage.go

@@ -8,6 +8,7 @@ import (
 	"github.com/go-gl/mathgl/mgl32"
 	"github.com/veandco/go-sdl2/sdl"
 	"rhemawavetech.com/rhemawave/internal/colors"
+	"rhemawavetech.com/rhemawave/internal/db"
 	"rhemawavetech.com/rhemawave/internal/fontManager"
 	"rhemawavetech.com/rhemawave/internal/keybinds"
 	"rhemawavetech.com/rhemawave/internal/logger"
@@ -39,6 +40,7 @@ type WiFiSetupPage struct {
 	applicationFont *fontManager.FontEntry
 
 	// UI elements
+	BaseFontSize         int
 	titleItem            StringItem
 	scanningStatusItem   StringItem
 	connectionStatusItem StringItem
@@ -75,9 +77,9 @@ func (p *WiFiSetupPage) Init(ctx *PageCtx) error {
 	}
 
 	fm := fontManager.Get()
-	font, ok := fm.GetFont("Roboto-Regular")
+	font, ok := fm.GetFont("SpaceMonoNerdFont-Regular")
 	if !ok {
-		return fmt.Errorf("could not find application font: Roboto-Regular")
+		return fmt.Errorf("could not find application font: SpaceMonoNerdFont-Regular")
 	}
 	p.applicationFont = font
 
@@ -92,6 +94,12 @@ func (p *WiFiSetupPage) Init(ctx *PageCtx) error {
 		return fmt.Errorf("failed to create scanning status item: %w", err)
 	}
 
+	config, err := db.GetConfig(p.Context.DbPtr)
+	if err != nil {
+		panic(err)
+	}
+	p.BaseFontSize = config.StandardFontSize
+
 	p.connectResultCh = make(chan error, 1)
 	p.ctx, p.cancel = context.WithCancel(context.Background())
 
@@ -310,7 +318,20 @@ func (p *WiFiSetupPage) rebuildNetworkList(nets []network.Network) {
 			label += "  ★"
 		}
 		if n.Security != network.SecurityOpen {
-			label += "  [" + string(n.Security) + "]"
+			var secStr string
+			switch n.Security {
+			case network.SecurityWEP:
+				secStr = "WEP"
+			case network.SecurityWPA:
+				secStr = "WPA"
+			case network.SecurityWPA2:
+				secStr = "WPA2"
+			case network.SecurityWPA3:
+				secStr = "WPA3"
+			default:
+				secStr = "Secured"
+			}
+			label += "  [" + secStr + "]"
 		}
 
 		c := colors.White
@@ -417,8 +438,6 @@ func (p *WiFiSetupPage) rebuildPasswordErrorTexture() {
 // ─── Render ───────────────────────────────────────────────────────────────────
 
 func (p *WiFiSetupPage) Render() error {
-	baseFontSize := p.Context.CfgPtr.StandardFontSize
-
 	solidShader, _ := shaderManager.Get().Get("solid_color")
 	textShader, _ := shaderManager.Get().Get("text")
 
@@ -435,7 +454,7 @@ func (p *WiFiSetupPage) Render() error {
 	)
 
 	// Title — 48pt
-	titleScale := float32(48) / float32(baseFontSize)
+	titleScale := float32(48) / float32(p.BaseFontSize)
 	titleW := float32(p.titleItem.W) * titleScale
 	titleH := float32(p.titleItem.H) * titleScale
 	titleX := float32(p.ScreenCenterX) - titleW/2
@@ -449,7 +468,7 @@ func (p *WiFiSetupPage) Render() error {
 	// Status message — 30pt (was 24pt, now 1.25x)
 	statusY := titleY - titleH - vertMargin
 	if p.status == wifiStatusScanning {
-		scale := float32(30) / float32(baseFontSize)
+		scale := float32(30) / float32(p.BaseFontSize)
 		w := float32(p.scanningStatusItem.W) * scale
 		h := float32(p.scanningStatusItem.H) * scale
 		x := float32(p.ScreenCenterX) - w/2
@@ -459,7 +478,7 @@ func (p *WiFiSetupPage) Render() error {
 			white,
 		)
 	} else if p.connectionStatusItem.ID != 0 {
-		scale := float32(30) / float32(baseFontSize)
+		scale := float32(30) / float32(p.BaseFontSize)
 		w := float32(p.connectionStatusItem.W) * scale
 		h := float32(p.connectionStatusItem.H) * scale
 		x := float32(p.ScreenCenterX) - w/2
@@ -488,7 +507,7 @@ func (p *WiFiSetupPage) Render() error {
 			)
 		}
 
-		scale := float32(24) / float32(baseFontSize)
+		scale := float32(24) / float32(p.BaseFontSize)
 		tw := float32(item.Item.W) * scale
 		th := float32(item.Item.H) * scale
 		tx := listX + float32(listPad)
@@ -502,7 +521,7 @@ func (p *WiFiSetupPage) Render() error {
 
 	// Password dialog
 	if p.isEnteringPassword {
-		if err := p.renderPasswordDialog(solidShader, textShader, float32(baseFontSize)); err != nil {
+		if err := p.renderPasswordDialog(solidShader, textShader, float32(p.BaseFontSize)); err != nil {
 			return err
 		}
 	}