chore: gitignore generated _templ.go files, track .templ sources

Generated _templ.go files are deterministic output from .templ sources,
same as output.css from input.css. Remove them from version control to
reduce diff noise and merge conflicts. Add build:templ and live:templ
tasks to the Taskfile so generation happens as part of the build.

features/c4game/pages/game.templ

@@ -0,0 +1,47 @@
+package pages
+
+import (
+	"github.com/ryanhamamura/c4/features/c4game/components"
+	sharedcomponents "github.com/ryanhamamura/c4/features/common/components"
+	"github.com/ryanhamamura/c4/features/common/layouts"
+	"github.com/ryanhamamura/c4/game"
+	"github.com/starfederation/datastar-go/datastar"
+)
+
+templ GamePage(g *game.Game, myColor int, messages []components.ChatMessage) {
+	@layouts.Base("Connect 4") {
+		<main
+			class="flex flex-col items-center gap-4 p-4"
+			data-signals="{chatMsg: ''}"
+			data-init={ datastar.GetSSE("/games/%s/events", g.ID) }
+		>
+			@sharedcomponents.BackToLobby()
+			@sharedcomponents.StealthTitle("text-3xl font-bold")
+			@components.PlayerInfo(g, myColor)
+			@components.StatusBanner(g, myColor)
+			<div class="c4-game-area">
+				@components.Board(g, myColor)
+				@components.Chat(messages, g.ID)
+			</div>
+			if g.Status == game.StatusWaitingForPlayer {
+				@components.InviteLink(g.ID)
+			}
+		</main>
+	}
+}
+
+templ JoinPage(gameID string) {
+	@layouts.Base("Connect 4 - Join") {
+		@sharedcomponents.GameJoinPrompt(
+			"/login?return_url=/games/"+gameID,
+			"/register?return_url=/games/"+gameID,
+			"/games/"+gameID,
+		)
+	}
+}
+
+templ NicknamePage(gameID string) {
+	@layouts.Base("Connect 4 - Join") {
+		@sharedcomponents.NicknamePrompt("/games/" + gameID + "/join")
+	}
+}