chore: prettier format all files, brotli, Sentry release tagging, CI gates

Prettier: auto-formatted 103 files to fix baseline. Prettier check in CI
  is now a hard gate (removed continue-on-error).

Brotli: installed libnginx-mod-http-brotli-filter/static. Enabled in nginx
  with brotli_static on for pre-compressed assets and comp_level 6.

Sentry releases: deploy script now exports VITE_APP_VERSION=<git-short-sha>
  before building so each Sentry release maps to an exact commit.
  CI also passes github.sha as VITE_APP_VERSION.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/pages/client/explore/Explore.tsx

@@ -94,9 +94,16 @@ export function AddServer() {
                 size="500"
               >
                 <Box grow="Yes">
-                  <Text as="h2" size="H4">Add Server</Text>
+                  <Text as="h2" size="H4">
+                    Add Server
+                  </Text>
                 </Box>
-                <IconButton size="300" onClick={() => setDialog(false)} radii="300" aria-label="Close">
+                <IconButton
+                  size="300"
+                  onClick={() => setDialog(false)}
+                  radii="300"
+                  aria-label="Close"
+                >
                   <Icon src={Icons.Cross} />
                 </IconButton>
               </Header>
@@ -110,7 +117,13 @@ export function AddServer() {
                 <Text priority="400">Add server name to explore public communities.</Text>
                 <Box direction="Column" gap="100">
                   <Text size="L400">Server Name</Text>
-                  <Input ref={serverInputRef} name="serverInput" aria-label="Server name" variant="Background" required />
+                  <Input
+                    ref={serverInputRef}
+                    name="serverInput"
+                    aria-label="Server name"
+                    variant="Background"
+                    required
+                  />
                   {exploreState.status === AsyncStatus.Error && (
                     <Text style={{ color: color.Critical.Main }} size="T300">
                       Failed to load public rooms. Please try again.