docs(website): match the Stalker and M3U guides to the reworked add dialog

PR #1796 gave every add-playlist form one "Add playlist" button,
"Playlist title" and "MAC address" labels, a single-ellipsis
"Validating portal…" and inline Stalker refusals under the portal URL.

- Stalker guide: name the "Add playlist" button everywhere, quote the
  current validating label, point to the "Server URL" field, describe
  the inline refusal and the validated / added-without-validation
  notices.
- M3U guide: only the URL form has a title field; a file keeps its
  name and pasted text is titled "Imported as text".
- Re-capture the Stalker and M3U add-playlist guide frames against the
  mock servers (fictional fixtures, guards passed).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/website/src/content/blog/m3u-playlist-epg-setup-guide.mdx

@@ -52,7 +52,7 @@ to the self-hosted browser version.
   steps={[
     'Open the Add playlist dialog from the dashboard, the header playlist switcher, or the command palette entry "Add M3U playlist".',
     'Choose "M3U URL" and paste the link your provider gave you, or choose "M3U file" and pick the file, or choose "Raw m3u text" and paste the playlist itself.',
-    'Give the playlist a title. For a URL the title is optional; IPTVnator falls back to the file name.',
+    'For a URL, optionally fill in a playlist title; without one, IPTVnator falls back to the file name. A file keeps its file name and pasted text is titled "Imported as text"; you can rename either later.',
     'Click "Add playlist". The channels are parsed, grouped by their group-title attribute, and the playlist opens.',
   ]}
 />

apps/website/src/content/blog/stalker-portal-setup-guide.mdx

@@ -14,11 +14,11 @@ faq:
 - q: Which portal URL should I enter?
   a: Whatever your provider gave you, as long as it starts with http or https. A bare host, an address ending in /c, portal.php, or server/load.php all work. IPTVnator probes the usual endpoints behind that address and keeps the one that answers, so you rarely need to guess the exact path.
 - q: The provider's MAC address is written with dashes or in lowercase. Does it matter?
-  a: No. IPTVnator normalizes hyphens, dots, spaces and lowercase letters into the canonical 00:1A:79:XX:XX:XX form when you leave the field, and again when you click Add. The bytes stay the same, so the portal sees the address it registered.
+  a: No. IPTVnator normalizes hyphens, dots, spaces and lowercase letters into the canonical 00:1A:79:XX:XX:XX form when you leave the field, and again when you click Add playlist. The bytes stay the same, so the portal sees the address it registered.
 - q: Should I turn on "Generate device IDs from the MAC address"?
   a: Only for a MAC the portal has never seen, or one you already use in StbEmu with generated IDs. A portal pins the first device ID it receives to the MAC and refuses any other one afterwards, so enabling it for an existing box with a different ID locks the account out. If your provider did not mention device IDs, leave the option off.
 - q: Why does IPTVnator ask for a username and password on some portals?
-  a: A few Ministra portals require a login on top of the MAC address. IPTVnator reports "This portal requires a login and password" when it sees that; fill in the two optional fields and click Add again. Portals that never ask for it ignore the fields.
+  a: A few Ministra portals require a login on top of the MAC address. IPTVnator reports "This portal requires a login and password" under the portal URL when it sees that; fill in the two optional fields and click Add playlist again. Portals that never ask for it ignore the fields.
 - q: Does IPTVnator show a program guide and catch-up for portal channels?
   a: Yes. It loads the portal's seven-day schedule once per session and shows the current program in the channel list and a timeline under the player. Channels the portal marks as archived can be played from the timeline. On the desktop app, XMLTV sources configured in the settings act as a fallback.
 - q: Where can I see when my portal subscription expires?
@@ -65,8 +65,8 @@ it, because some reseller panels are configured differently.
   steps={[
     'Open the Add playlist dialog from the dashboard, the header playlist switcher, or the command palette entry "Add Stalker portal".',
     'Choose the "Stalker portal" method.',
-    'Fill in a title of your choice, the portal URL and the MAC address. Leave the optional fields empty unless your provider gave you values for them.',
-    'Click "Add". IPTVnator probes the portal, authenticates with your MAC address, and opens the new source. "Validating portal..." can take a few seconds on slow servers.',
+    'Fill in a playlist title of your choice, the portal URL in the "Server URL" field and the MAC address. Leave the optional fields empty unless your provider gave you values for them.',
+    'Click "Add playlist". IPTVnator probes the portal, authenticates with your MAC address, and opens the new source. "Validating portal…" can take a few seconds on slow servers.',
   ]}
 />
 
@@ -75,10 +75,10 @@ it, because some reseller panels are configured differently.
 <Alert type="success" title="Paste the provider message instead">
   The Auto-detect method in the same dialog reads a pasted email or chat message. A MAC
   address is its strongest signal, so a message with a portal link and a MAC address
-  pre-fills the Stalker form for you. You still click Add yourself.
+  pre-fills the Stalker form for you. You still click Add playlist yourself.
 </Alert>
 
-## What happens when you click Add
+## What happens when you click Add playlist
 
 Providers write portal addresses in a dozen shapes, and the same host can run a strict
 Ministra middleware or a tolerant reseller panel. Guessing from the URL used to break real
@@ -94,10 +94,11 @@ setups, so IPTVnator no longer guesses:
    that address, and if a provider migrates the portal, IPTVnator re-probes once on the
    first failure and repairs the stored connection.
 
-On a full portal the profile also carries your subscription facts, and the dialog confirms
-the import with the expiry date. A portal that cannot be reached during the import is still
-added when the address looks like a panel, so a temporarily offline provider does not block
-you; the next successful request completes the setup.
+On a full portal the profile also carries your subscription facts, and IPTVnator confirms
+the import with "Portal validated" and the expiry date. A portal that cannot be reached
+during the import is still added when the address looks like a panel, with a notice that it
+was added without validation, so a temporarily offline provider does not block you; the next
+successful request completes the setup.
 
 ## After the import
 
@@ -146,7 +147,8 @@ behind your back, and that matters because of how portals treat device IDs:
   later one. A later empty value locks the MAC out for good.
 - **Generate device IDs from the MAC address** produces the same pair StbEmu generates, so a
   MAC you already use there keeps working. It is offered at import only, writes the values
-  into the visible fields, and re-derives them if you correct the MAC before clicking Add.
+  into the visible fields, and re-derives them if you correct the MAC before clicking Add
+  playlist.
 - Once a device ID is stored, the playlist details dialog warns before you change or clear
   it, because the portal will not accept the new value.
 
@@ -155,10 +157,13 @@ exactly those values.
 
 ## Troubleshooting
 
+When the portal refuses the import, the dialog stays open and shows the reason under the
+portal URL, followed by the portal's own words when it sent any. Editing a field clears it.
+
 - **The portal requires a login and password**: fill in the optional username and password
-  fields and click Add again. Some Ministra portals demand a login on top of the MAC address.
+  fields and click Add playlist again. Some Ministra portals demand a login on top of the MAC address.
 - **The portal rejected the login and password**: the credentials are wrong or the
-  subscription lapsed; the portal's own message is shown below the headline.
+  subscription lapsed; the portal's own message follows the headline.
 - **The portal has a different device ID registered for this MAC address**: another box or
   emulator authenticated first. Restore the device ID you used there, or ask the provider to
   reset the device for this MAC.