docs(ui-kit/angular): flatten component nav, drop enableThreadSubscription from global config

[aanshisingh-cometchat]

Two independent Angular docs changes, both scoped to ui-kit/angular/ plus the Angular slice of docs.json.

1. Flatten single-page nav groups

The Components nav wrapped seven single-page entries in their own accordion, so each cost a click to reach one page. All seven are now plain links, and Pinned & Saved is split into its two pages:

Message Header          Pinned Messages
Search                  Saved Messages
Message List
Message Composer        Message Bubbles   ⌄  (14)
Message Bubble          Reactions         ⌄  (3)
Message Information     Calls             ⌄  (4)
Thread Header           AI                ⌄  (5)

The rule is now: a group exists only where it holds more than one page. React v7 already reads this way — it has one accordion to Angular's previous eight.

One title change came with it: cometchat-search.mdx was title: "CometChatSearch". A flattened entry takes its label from the page's own title, so that row would have read "CometChatSearch" while every sibling reads a human name (Message Header, not CometChatMessageHeader). Retitled to Search, which is what the group was called.

2. Drop enableThreadSubscription from Global Configuration

Removed from the Global Configuration reference — the property table row, its own Feature Gates section, and its entries in the components table. That left CometChatThreadHeader with no rows, so that line went too, and the Feature Gates intro now says two properties rather than three.

Removing the section broke every link pointing at #enablethreadsubscription, so the four that did are re-pointed. Each of those pages already links the Thread Subscription guide elsewhere, so the dead anchor is dropped and the property named inline instead.

The flag stays documented in guides/thread-subscription.mdx — the AI Quick Reference row, the code sample, and the "Turn the gate on" step — which is where someone enabling the feature is already reading.

Also on Core Features: Thread Subscription moves from a top-level ## to a ### under Threaded Conversations. Everything else on that page works the moment you install the kit; thread subscription is off by default and needs an opt-in, so listing it beside Reactions and Read Receipts promised something the reader wouldn't get. The #thread-subscription anchor is unchanged, and this matches how Pinned and Saved Messages already nests ### App Settings.

Verification

• Ran locally with mint dev and checked each changed page in the browser.
• Rendered HTML confirms <h2 id="threaded-conversations"> → <h3 id="thread-subscription">, and zero occurrences of enableThreadSubscription on the Global Configuration page.
• All 216 Angular page refs in docs.json resolve to real files; docs.json re-parses as valid JSON.
• No internal link in any changed file is broken, and no global-config#enablethreadsubscription reference remains anywhere in the repo.

Follow-ups, not in this PR

• Android parity. ui-kit/android/core-features.mdx:186 still has ## Thread Subscription as a top-level sibling, and Android's pin/save section splits differently from Angular's. Worth aligning the two.
• voice-note-bubble has no Angular page. React documents it and the component ships in the Angular kit (projects/cometchat-uikit/src/lib/components/cometchat-voice-note-bubble), but there's no .mdx for it.
• Filename prefix. Angular uses cometchat- on 43 of 45 component pages; React uses it on none. Aligning would need 43 renames plus redirects, so it belongs in its own PR.

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