fix(media_player): dedupe source_list case-insensitively (t53 F1)

t52 F1: the dropdown collapsed exact duplicates but not names that differ only by case.
With a map of {com.a: 'Dup', com.b: 'dup'} the pre-fix tree offered ['Dup', 'dup']
(two rows) while the reverse lookup — case-insensitive by design since t47 — resolved
BOTH spellings to the first entry. So row two was a row that LIED: picking it launched
com.a, the app row one already names. Editor-reachable (two valid lines), unlike the
earlier hand-edit-only edges, which is why it is fixed rather than documented.

source_list now dedupes on name.casefold(), keeping the first spelling in the user's
typed map order. One row per name means a row can only launch the app it shows. The
shadowed package is not lost: the Browse tree still lists it under its own package id
(the t51 rule — both entries kept, each reachable by id) and select_source accepts that
id, pinned by test. The t51 policy is otherwise untouched: names stripped once, blank
name/package entries dropped, exact duplicates already collapsed, well-formed maps
byte-identical to the Browse titles with inner spaces preserved.

README: a short 'Known limits (the Apps map)' note records the two accepted boundaries
so they are known rather than latent — names differing only by case offer one row (the
shadowed app stays reachable by id), and a hand-padded map value is shown cleaned in
the dropdown and the Browse tree while app_name/source/Current App sensor display it
verbatim, so `source` can be a string that is not in source_list (a blank value falls
through to the raw package).

RED PROOF (previous tree swapped in, then restored): 4 failed / 5 passed pre-fix for
the case tests, all green after. The literal pre-fix symptom:
`assert ['Dup', 'dup'] == ['Dup']` — "Left contains one more item: 'dup'"; the
wrong-app half is pinned by `_source_package("dup") == "com.a"`, which holds on BOTH
trees and is exactly the chain that made row two launch row one's app. The new
no-duplicate invariant fails pre-fix with len(['dup', 'dup']) == 2 versus 1.

Verified: 471 passed / 2 skipped, 472 / 1 with androidtvremote2, ruff clean, drift
engine exit 0 under real HA (23 modules, 58 imports, 164 relative imports, 36 call
arguments, 7 awaited HA calls); README YAML blocks still parse (5) and the t47/t48/t51
rig is green.

README.md

@@ -392,6 +392,19 @@ Selecting a source is sometimes more than launching an app — an AVR input, a s
 switch. That is what the **Select source script** above is for: with one configured it
 replaces the native launch entirely.
 
+#### Known limits (the Apps map)
+
+The map is your own override, so two shapes are accepted rather than papered over:
+
+- **Names differing only by case** (`com.a=Dup`, `com.b=dup`) offer **one** dropdown
+  row — the first spelling — because name matching is case-insensitive. The shadowed
+  app is not lost: the Browse tree still lists it under its own package id, and
+  `media_player.select_source` accepts that id.
+- A **padded value** typed by hand (`com.x=  Netflix  `) is shown cleaned in the
+  dropdown and the Browse tree, but `app_name`, `source` and the Current App sensor
+  display the map value **verbatim** — so `source` can be a string that is not in
+  `source_list`. A blank value falls through to the raw package instead.
+
 ### Remote command script
 
 `remote.send_command` sends protocol keys: repeats, long presses (`START_LONG`/

custom_components/nvidia_shield/media_player.py

@@ -734,7 +734,10 @@ class NvidiaShieldMediaPlayer(MediaPlayerEntity):
           tree reaches each by its own package id, so neither app is hidden — while
           the FIRST in map order wins the name: that is the single entry
           source_list offers and the package select_source resolves. Map order is
-          the user's order, so the winner does not move between rebuilds.
+          the user's order, so the winner does not move between rebuilds. "The same
+          name" is judged case-insensitively (t53), because the reverse lookup is:
+          names differing only by case would otherwise give the dropdown a second
+          row that launches the FIRST entry's app.
 
         A well-formed map (what the editor and the curated default produce) passes
         through byte-identical: stripping only touches the edges, so a name like
@@ -758,11 +761,26 @@ class NvidiaShieldMediaPlayer(MediaPlayerEntity):
         the page does not shuffle it. Blanks are already gone and names already
         stripped by ``_app_directory`` (t49/t51) — the normalization lives in that
         one accessor so the dropdown, the browse tree and the reverse lookup cannot
-        disagree. Each name is offered ONCE: if two packages normalize to the same
+        disagree.
-        name, the first in map order is the one this list resolves to (and the
+
-        second stays reachable through the browse tree, by its package id).
+        Each name is offered ONCE, compared CASE-INSENSITIVELY (t53), keeping the
+        first spelling the user typed. Exact duplicates were already collapsed, but
+        ``Dup``/``dup`` were not: the dropdown then showed two rows while the
+        reverse lookup — which is case-insensitive by design (t47) — resolved BOTH
+        of them to the first entry, so the second row launched the wrong app. One
+        row per name means a row can only launch the app it shows. The shadowed
+        package is not lost: the browse tree still lists it under its own id, and
+        select_source accepts that id.
         """
-        return list(dict.fromkeys(self._app_directory.values()))
+        seen: set[str] = set()
+        offered: list[str] = []
+        for name in self._app_directory.values():
+            folded = name.casefold()
+            if folded in seen:
+                continue
+            seen.add(folded)
+            offered.append(name)
+        return offered
 
     @property
     def source(self) -> str | None:
@@ -1106,9 +1124,12 @@ class NvidiaShieldMediaPlayer(MediaPlayerEntity):
 
         Both sides are normalized the same way: the query is stripped here and the
         names were stripped when the directory was built (t51), so a padded entry
-        matches its trimmed spelling. Names are compared case-insensitively, and
+        matches its trimmed spelling. Names are compared case-insensitively — which
-        when two packages share a name the first in map order wins — the same one
+        is why ``source_list`` collapses names that differ only by case (t53), so
-        ``source_list`` offers (see ``_app_directory``).
+        that the row it offers resolves back to the same app it displays. When two
+        packages share a name the first in map order wins, the same one
+        ``source_list`` offers (see ``_app_directory``); the shadowed package stays
+        reachable by passing its id.
         """
         directory = self._app_directory
         wanted = str(source or "").strip()

tests/test_media_sources.py

@@ -371,3 +371,104 @@ class TestNormalizedDirectories:
         assert player.source_list == ["TiviMate Pro", "Netflix"]
         assert [child.title for child in root.children] == ["TiviMate Pro", "Netflix"]
         assert player._source_package("TiviMate Pro") == TIVIMATE
+
+
+class TestCaseInsensitiveNames:
+    """t53: one row per NAME, compared case-insensitively — as the lookup does.
+
+    The dropdown and the reverse lookup disagreed about case: two entries called
+    `Dup` and `dup` survived an exact-match dedupe as two rows, while
+    `_source_package` — case-insensitive by design (t47) — resolved BOTH to the
+    first entry. So the second row launched the first entry's app: a row that lies
+    about what it does, and the one shape here the editor can produce by itself.
+    """
+
+    async def test_names_differing_only_by_case_are_offered_once(self, modules):
+        player, _served = _player(modules, app_map={"com.a": "Dup", "com.b": "dup"})
+
+        # one row, keeping the first spelling the user typed
+        assert player.source_list == ["Dup"]
+
+        # ...and the Browse tree still holds both apps, each under its own id
+        root = await player.async_browse_media()
+        assert [(c.media_content_id, c.title) for c in root.children] == [
+            ("com.a", "Dup"),
+            ("com.b", "dup"),
+        ]
+
+    async def test_the_offered_row_launches_the_app_it_shows(self, modules):
+        player, _served = _player(modules, app_map={"com.a": "Dup", "com.b": "dup"})
+
+        await player.async_select_source(player.source_list[0])
+
+        assert player._manager._protocol.launch_calls == ["com.a"]  # the row it shows
+
+    async def test_the_shadowed_app_stays_reachable_by_id(self, modules):
+        player, _served = _player(modules, app_map={"com.a": "Dup", "com.b": "dup"})
+
+        assert player._source_package("com.b") == "com.b"
+
+        await player.async_select_source("com.b")
+
+        assert player._manager._protocol.launch_calls == ["com.b"]
+
+        # the shadowed NAME still resolves to the one the list offers (first wins)
+        assert player._source_package("dup") == "com.a"
+
+    async def test_the_first_spelling_wins_in_map_order(self, modules):
+        player, _served = _player(modules, app_map={"com.b": "dup", "com.a": "Dup"})
+
+        assert player.source_list == ["dup"]
+
+        await player.async_select_source("dup")
+
+        assert player._manager._protocol.launch_calls == ["com.b"]
+
+    async def test_a_mixed_map_offers_each_name_once(self, modules):
+        player, _served = _player(
+            modules,
+            app_map={
+                "com.a": "Dup",
+                "com.b": "dup",
+                "com.netflix.ninja": "Netflix",
+                "com.google.android.youtube.tv": "netflix",
+                TIVIMATE: "TiviMate Pro",
+            },
+        )
+
+        assert player.source_list == ["Dup", "Netflix", "TiviMate Pro"]
+        assert player._source_package("Netflix") == "com.netflix.ninja"
+
+    def test_the_offered_list_never_repeats_a_name(self, modules):
+        """The invariant behind the fix, over every map shape in this file."""
+        for app_map in (
+            None,
+            {"com.a": "Dup", "com.b": "dup"},
+            {"com.a": "Dup", "com.b": "DUP", "com.c": "dup"},
+            {"com.blank": "", TIVIMATE: "  TiviMate  ", "com.a": "Netflix", "com.b": "netflix"},
+        ):
+            player, _served = _player(modules, app_map=app_map)
+            folded = [name.casefold() for name in player.source_list]
+
+            assert len(folded) == len(set(folded)), app_map
+            assert len(folded) == len(player.source_list)
+
+    def test_a_padded_map_value_is_displayed_verbatim_by_app_name(self, modules):
+        """The README's boundary, pinned: the list cleans it, app_name does not.
+
+        The name map is the user's own override, so it is used as typed — which is
+        why `source` can be a string that is not in source_list.
+        """
+        player, _served = _player(
+            modules, app_map={TIVIMATE: "  TiviMate  "}, foreground=TIVIMATE
+        )
+
+        assert player.source_list == ["TiviMate"]  # the dropdown cleans it
+        assert player.source == "  TiviMate  "  # this surface shows it as typed
+        assert player.source not in player.source_list
+
+    def test_a_blank_map_value_falls_through_to_the_raw_package(self, modules):
+        """Blanks are not displayed as nothing — the chain continues past them."""
+        player, _served = _player(modules, app_map={TIVIMATE: ""}, foreground=TIVIMATE)
+
+        assert player.source == TIVIMATE