Add site login and alternate-source search for paywalled articles

Deliberately not a paywall-bypass mechanism -- that space (archive.today-style
proxies, "Bypass Paywalls" extensions) is legally grey, adversarial toward
publishers, and constantly breaking. Instead:

- BrowserScreen: a real interactive mini-browser (JS + DOM storage on,
  ordinary navigation, no Readability interception) for the two cases where
  the user needs to actually USE a page rather than read it. Reached from
  a new overflow menu on the article reader:
  - "Log in to this site" opens the article's own URL there so the user can
    sign into a site they already subscribe to. Needs no extra plumbing:
    Android's CookieManager is one process-wide store shared by every WebView
    in the app, so a session cookie set here is picked up automatically by
    the reader's (JS-off) extraction WebView on the next visit to that
    domain -- same as a normal browser remembering you're signed in.
  - "Find another source" runs a web search on the article's title in the
    same browser, so the user can pick a different, non-paywalled outlet
    covering the same story themselves -- plain search/discovery, not
    circumvention.

Verified live: search opened a real, interactive Google results page with
working title-bar sync; back navigation (via BackHandler, goBack() when the
WebView has history, else pop the screen) returned cleanly to the article.

1 files changed, 13 insertions, 1 deletions

diff --git a/app/src/main/java/org/terst/feedreader/ui/MainActivity.kt b/app/src/main/java/org/terst/feedreader/ui/MainActivity.kt
index 95ef71e..bd09393 100644
--- a/app/src/main/java/org/terst/feedreader/ui/MainActivity.kt
+++ b/app/src/main/java/org/terst/feedreader/ui/MainActivity.kt
@@ -1,6 +1,7 @@
 package org.terst.feedreader.ui
 
 import android.os.Bundle
+import android.webkit.CookieManager
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.compose.foundation.layout.fillMaxSize
@@ -28,6 +29,9 @@ class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         FeedFetchWorker.schedulePeriodic(applicationContext)
+        // Explicit, even though it defaults on -- BrowserScreen relies on cookies set
+        // during a site login surviving into the reader's later extraction requests.
+        CookieManager.getInstance().setAcceptCookie(true)
 
         setContent {
             // Dark by default -- per user request, not following system light/dark for now.
@@ -85,7 +89,8 @@ fun FeedReaderApp() {
                 feedId = feedId,
                 initialArticleId = articleId,
                 onBack = { navController.popBackStack() },
-                onOpenLink = { url -> navController.navigate("linkReader/${encodeNavArg(url)}") }
+                onOpenLink = { url -> navController.navigate("linkReader/${encodeNavArg(url)}") },
+                onOpenBrowser = { url -> navController.navigate("browser/${encodeNavArg(url)}") }
             )
         }
         composable(
@@ -101,6 +106,13 @@ fun FeedReaderApp() {
                 onOpenLink = { nextUrl -> navController.navigate("linkReader/${encodeNavArg(nextUrl)}") }
             )
         }
+        composable(
+            "browser/{url}",
+            arguments = listOf(navArgument("url") { type = NavType.StringType })
+        ) { backStackEntry ->
+            val url = decodeNavArg(backStackEntry.arguments?.getString("url") ?: "")
+            BrowserScreen(startUrl = url, onBack = { navController.popBackStack() })
+        }
         composable("addFeed") {
             AddFeedScreen(onDone = { navController.popBackStack() })
         }