fix(tauri-app): wrap profile methods in PdsHttpClient impl block

The profile.get_record / set_profile methods landed in the WIP
outside any `impl PdsHttpClient { … }` block, with a stray
`&self` parameter that the parser correctly rejected. Wrap them
in a fresh impl block and add the missing closing brace — no
behaviour change, just a structural fix so the binary builds.

---

feat(tauri-app): X-style profile page with banner / avatar overlap / tabs

Replace the existing UserProfileView with a new ProfileView that
follows the X (Twitter) profile layout but stays in our
monospace / orange-on-black terminal aesthetic:

* Banner (140 px) at the top. The user's `banner_cid` (when
  present) is fetched via the existing `fetchBlob` Tauri
  command and set as a background-image. When the profile has no
  banner we render a subtle orange-tinted grid placeholder so the
  page never looks bare.
* 96 px circular avatar that overlaps the bottom of the banner by
  ~44 px, with a 4 px border in `var(--bg)` so the cutout reads
  cleanly against any banner colour.
* Identity row: large bold display name, dim handle below.
* Bio, DID meta line, and the posts / followers / following count
  dl — all monospace, all using our spacing / colour tokens.
* Tab row with the existing 'posts' tab active and
  'replies' / 'likes' rendered disabled (placeholder for future
  work).
* Edit form (gated on `current_user_did === profile.did`) with
  display-name, description, and avatar upload fields.

App.svelte refactor: the 'profile' view (current user) and the
'user' view (someone else) now both render `<ProfileView>`. The
duplicated edit state (`editingProfile`, `editProfileName`,
`editProfileDesc`, `editProfileAvatarCid`, `savingProfile`),
the duplicate `pickAndUploadAvatar` / `saveProfile` /
`refreshProfile` functions, and the unused `displayHandle` /
`fetchProfile` / `pickAndUploadImage` / `setMyProfile` imports
are gone. ProfileView handles its own fetch + edit state
internally, so the App.svelte section collapses from ~145 lines
of inline JSX to ~12.

The legacy .profile__head / .profile__bio / .counts style
classes that the new component no longer references are also
removed.

crates/tauri-app/src-tauri/src/pds_client.rs

@@ -385,6 +385,8 @@ pub struct UploadedBlobRef {
     #[serde(rename = "$link")]
     pub link: String,
 }
+
+impl PdsHttpClient {
     /// `POST /xrpc/com.atproto.repo.getRecord?repo=<did>&collection=app.bsky.actor.profile&rkey=self`
     /// Returns the record's CBOR-decoded value as JSON, or `None` if no
     /// record exists for that path. The server replies with a
@@ -446,3 +448,4 @@ pub struct UploadedBlobRef {
         let v: serde_json::Value = r.json().await?;
         Ok(v.get("profile").cloned().unwrap_or(serde_json::Value::Null))
     }
+}