F3: Kimi inference pipeline + full grok cloud-surface excision

Sampler / inference (PRD F3):
- kimi_compat.rs: single adaptation point for the Kimi chat/completions
  dialect (thinking-field mapping, model_id stripping, empty-content
  tool-call message fix, stream_options.include_usage), with kimi-cli
  source citations
- Rate-limit handling reworked for Kimi/Moonshot semantics; UA kigi/{version}
- /models replaces the xAI models-v2 endpoint everywhere; idle model
  refresh carries X-Msh-* device headers only (X-XAI-Token-Auth and
  x-grok-client-mode/CLIENT_MODE_HEADER machinery deleted)

Cloud-surface excision (PRD §5, zero-egress):
- remote/ conversations lane, cli-chat-proxy-types crate, prod/ dir,
  share command, credit bar: deleted (single local session lane;
  paginate() replaces merge_and_paginate)
- Subscription/tier gate stack deleted end-to-end: AppView
  gate/tier/team/ZDR fields, app/subscription.rs watch loop,
  dispatch/billing.rs paywall + SuperGrok upsell, free-usage-exhausted
  chain, tier-restricted commands, GateInfo, RemoteSettings gate fields,
  SettingsUpdateNotification gate fields
- /privacy + coding-data-sharing setting deleted (backed by a dead xAI
  RPC; Kigi is zero-egress — nothing to share or retain remotely)

Auth UX correctness (user-reported):
- Device-flow fixtures now mirror the live Kimi payload shape
  (https://www.kimi.com/code/authorize_device?user_code=..., verified
  against auth.kimi.com); the fabricated auth.kimi.com/device?code=...
  URLs are gone
- open_browser_detached is a no-op under cfg(test): unit tests drove
  wiremock fixture URLs into the real browser (root cause of the
  "garbage mock link" ABCD-1234 tabs)
- Welcome/pager-minimal rebrand: Grok Build -> Kigi, grok.com ->
  kimi.com, "Sign in to Grok" -> "Sign in to Kimi"

crates/codegen/kigi-tui/src/views/modal.rs

@@ -363,11 +363,8 @@ pub enum PaletteCommand {
     OpenAgentsModal,
 }
 /// Build the default set of palette entries with section grouping.
-///
-/// `sharing_enabled` controls whether the `/share` entry is included.
-/// Pass `true` to preserve the default behavior (show `/share`).
-pub fn default_palette_entries(sharing_enabled: bool) -> Vec<PaletteEntry> {
-    let mut entries = vec![
+pub fn default_palette_entries() -> Vec<PaletteEntry> {
+    let entries = vec![
         PaletteEntry {
             label: "Session".into(),
             shortcut: String::new(),
@@ -398,11 +395,6 @@ pub fn default_palette_entries(sharing_enabled: bool) -> Vec<PaletteEntry> {
             shortcut: "/resume".into(),
             command: PaletteCommand::SlashCommand("/resume".into()),
         },
-        PaletteEntry {
-            label: "Share Session".into(),
-            shortcut: "/share".into(),
-            command: PaletteCommand::SlashCommand("/share".into()),
-        },
         PaletteEntry {
             label: "Rename Session".into(),
             shortcut: "/rename ".into(),
@@ -536,19 +528,12 @@ pub fn default_palette_entries(sharing_enabled: bool) -> Vec<PaletteEntry> {
             command: PaletteCommand::Quit,
         },
     ];
-    if !sharing_enabled {
-        entries.retain(|e| {
-            !matches!(
-                & e.command, PaletteCommand::SlashCommand(s) if s.trim() == "/share"
-            )
-        });
-    }
     entries
 }
 #[allow(clippy::collapsible_if)]
 /// Filter palette entries for search, preserving section headers when any item in the section matches.
-pub fn filter_palette_entries(query: &str, sharing_enabled: bool) -> Vec<PaletteEntry> {
-    let all = default_palette_entries(sharing_enabled);
+pub fn filter_palette_entries(query: &str) -> Vec<PaletteEntry> {
+    let all = default_palette_entries();
     let query_lower = query.to_lowercase();
     if query_lower.is_empty() {
         return all;
@@ -1233,26 +1218,11 @@ mod doc_viewer_scroll_tests {
     }
 }
 #[cfg(test)]
-mod palette_sharing_tests {
+mod palette_tests {
     use super::*;
-    fn has_share(entries: &[PaletteEntry]) -> bool {
-        entries.iter().any(|e| {
-            matches!(
-                & e.command, PaletteCommand::SlashCommand(s) if s.trim() == "/share"
-            )
-        })
-    }
-    #[test]
-    fn default_palette_includes_share_when_enabled() {
-        let entries = default_palette_entries(true);
-        assert!(
-            has_share(&entries),
-            "/share should be present when sharing_enabled=true"
-        );
-    }
     #[test]
     fn default_palette_includes_dashboard() {
-        let entries = default_palette_entries(true);
+        let entries = default_palette_entries();
         let has_dashboard = entries.iter().any(|e| {
             matches!(
                 & e.command, PaletteCommand::SlashCommand(s) if s.trim() ==
@@ -1270,38 +1240,9 @@ mod palette_sharing_tests {
         );
     }
     #[test]
-    fn default_palette_omits_share_when_disabled() {
-        let entries = default_palette_entries(false);
-        assert!(
-            !has_share(&entries),
-            "/share must not appear in palette when sharing_enabled=false"
-        );
-    }
-    #[test]
-    fn filter_palette_omits_share_when_disabled() {
-        let entries = filter_palette_entries("", false);
-        assert!(
-            !has_share(&entries),
-            "/share must not appear in unfiltered palette when sharing_enabled=false"
-        );
-        let entries = filter_palette_entries("share", false);
-        assert!(
-            !has_share(&entries),
-            "/share must not appear when filtering for 'share' with sharing_enabled=false"
-        );
-    }
-    #[test]
-    fn filter_palette_includes_share_when_enabled_and_matched() {
-        let entries = filter_palette_entries("share", true);
-        assert!(
-            has_share(&entries),
-            "/share should match a 'share' query when sharing_enabled=true"
-        );
-    }
-    #[test]
     fn palette_tools_section_routes_each_tab_to_itself() {
         use crate::views::extensions_modal::ExtensionsTab;
-        let entries = default_palette_entries(true);
+        let entries = default_palette_entries();
         for (label, expected) in [
             ("Hooks", ExtensionsTab::Hooks),
             ("Plugins", ExtensionsTab::Plugins),