fix(snap): drop uinput plug denied by the Snap Store (#960)

* fix(snap): drop uinput plug denied by the Snap Store

The Snap Store rejected revisions 8-10 over the super-privileged uinput
plug (allow-installation), and reviewers denied the grant request on
forum.snapcraft.io/t/53528, pointing at the RemoteDesktop portal path
the app already prefers. Remove the plug and the uinput-only ydotool so
revisions pass automatic review again; Wayland typing continues through
the RemoteDesktop portal (already the default backend ahead of ydotool),
wtype, IBus Wayland on KDE, and clipboard paste.

KDE Plasma loses its correct-case ydotool path on the store snap (KWin's
portal mangles keysyms on some layouts, KDE bug 489021); the v0.18.x
GitHub .snap still declares uinput for KDE users who sideload it.

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

* fix(text-injection): stop telling snap users to connect uinput

The Store snap no longer declares the plug, so the warning pointed at a
command that cannot work. The Snap hints now explain that only the
v0.18.x GitHub sideload declares uinput, and that native Wayland typing
uses the RemoteDesktop portal or IBus Wayland on KDE.

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

---------

Co-authored-by: Jatin K Malik <jk.malik@yahoo.com>
Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

.github/workflows/release.yml

@@ -283,11 +283,10 @@ jobs:
             Tagged releases also attach `vocalinux_${{ steps.get_version.outputs.VERSION }}_amd64.snap`
             and try the Snap Store (`edge` and `candidate`). `stable` is promoted
             from candidate after QA by the `snap-promote.yml` dispatch workflow.
-            Super-privileged plugs such as `uinput` can hold the Store revision in human
-            review; the GitHub `.snap` is the sideload in that case:
+            Wayland typing runs through the RemoteDesktop portal; the snap ships no `uinput` plug.
+            The GitHub `.snap` is also the sideload while a Store revision lags:
             ```bash
             sudo snap install --dangerous ./vocalinux_${{ steps.get_version.outputs.VERSION }}_amd64.snap
-            sudo snap connect vocalinux:uinput
             ```
             `--dangerous` is required because this file is not a Store revision. It will not
             refresh from the Store. amd64 only.
@@ -983,8 +982,8 @@ jobs:
           ssh_private_key: ${{ secrets.AUR_SSH_PRIVATE_KEY }}
           commit_message: 'Release ${{ github.ref_name }}'
 
-  # GitHub Release first, Store second. uinput is super-privileged, so the
-  # Store can queue a human review and refuse edge/candidate; the .snap still
+  # GitHub Release first, Store second. A super-privileged plug can still
+  # queue a human review and refuse edge/candidate; the .snap still
   # has to land on the tag for sideload. grade: stable allows candidate; do
   # not auto-release to stable — promote after QA via snap-promote.yml (#783).
   # Secret: SNAPCRAFT_STORE_CREDENTIALS (snapcraft export-login).