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>

.github/DISCUSSION_TEMPLATE/issue-triage.yml

@@ -1,4 +1,4 @@
-labels: ["needs-confirmation"]
+labels: ['needs-confirmation']
 body:
   - type: markdown #add faqs in future
     attributes:
@@ -7,7 +7,7 @@ body:
         > Please read through [the Discussion rules](https://github.com/cinnyapp/cinny/discussions/2653) and check for both existing [Discussions](https://github.com/cinnyapp/cinny/discussions?discussions_q=) and [Issues](https://github.com/cinnyapp/cinny/issues?q=sort%3Areactions-desc) prior to opening a new Discussion.
   - type: markdown
     attributes:
-      value: "# Issue Details"
+      value: '# Issue Details'
   - type: textarea
     attributes:
       label: Issue Description
@@ -64,7 +64,7 @@ body:
         - Browser: 
         - Cinny Web Version: (app.cinny.in or self hosted)
         - Cinny desktop Version: (appimage or deb or flatpak)
-        - Matrix Homeserver: 
+        - Matrix Homeserver:
       placeholder: |
         - OS: Windows 11
         - Browser: Chrome 120.0.6099.109
@@ -80,12 +80,12 @@ body:
       label: Relevant Logs
       description: |
         If applicable, add browser console logs to help explain your problem.
-        
+
         **To get browser console logs:**
         - Chrome/Edge: Press F12 → Console tab
         - Firefox: Press F12 → Console tab  
         - Safari: Develop → Show Web Inspector → Console
-        
+
         Please wrap large log outputs in code blocks with triple backticks (```).
       placeholder: |
         ```
@@ -98,7 +98,7 @@ body:
       render: shell
     validations:
       required: false
-  - type: textarea 
+  - type: textarea
     attributes:
       label: Additional context
       description: |
@@ -119,7 +119,7 @@ body:
         > Use these links to review the existing Cinny [Discussions](https://github.com/cinnyapp/cinny/discussions?discussions_q=) and [Issues](https://github.com/cinnyapp/cinny/issues?q=sort%3Areactions-desc).
   - type: checkboxes #add faqs in future
     attributes:
-      label: "I acknowledge that:"
+      label: 'I acknowledge that:'
       options:
         - label: I have searched the Cinny repository (both open and closed Discussions and Issues) and confirm this is not a duplicate of an existing issue or discussion.
           required: true