feat: LaTeX paste text area on resume step (primary input)

Replace file upload for LaTeX with a text area where user can paste
their .tex source directly. Tectonic compiles on button click.
PDF upload kept below as secondary option. Saved .tex restored into
the text area on next visit so the user can edit without re-pasting.

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

ui.py

@@ -1296,58 +1296,113 @@ if show_config:
     <div class="step-number {"done" if has_resume else ""}">{"✓" if has_resume else "1"}</div>
     <p class="step-title-text">Upload your resume</p>
   </div>
-  <p class="step-helper">Upload your LaTeX source for the best ATS results, or a PDF if you don't have one.</p>
-</div>
+  <p class="step-helper">Paste your LaTeX source for the best ATS results, or upload a PDF below.</p>
+</div>""")
 
-<div style="display:flex;gap:12px;margin:12px 0 8px">
-  <div style="flex:1;padding:14px 16px;background:#EEF2FF;border:2px solid #6366F1;border-radius:12px">
-    <div style="font-size:1rem;font-weight:700;color:#4338CA">📄 LaTeX (.tex)</div>
-    <div style="font-size:0.78rem;color:#6366F1;margin-top:2px">Recommended — highest ATS accuracy</div>
-  </div>
-  <div style="flex:1;padding:14px 16px;background:#F8FAFC;border:1px solid #E2E8F0;border-radius:12px">
-    <div style="font-size:1rem;font-weight:500;color:#475569">📋 PDF</div>
-    <div style="font-size:0.78rem;color:#94A3B8;margin-top:2px">Also supported</div>
+            # ── PRIMARY: LaTeX paste ──────────────────────────────────────────
+            st.html("""
+<div style="background:#EEF2FF;border:2px solid #6366F1;border-radius:12px;
+            padding:14px 16px;margin:12px 0 8px">
+  <div style="font-size:1rem;font-weight:700;color:#4338CA">📄 LaTeX source</div>
+  <div style="font-size:0.78rem;color:#6366F1;margin-top:2px">
+    Recommended — paste your full .tex code below for highest ATS accuracy
   </div>
 </div>""")
 
-            resume_file = st.file_uploader(
-                "Drop your .tex or PDF resume here",
-                type=["tex", "pdf"], key="resume_upload",
-                label_visibility="visible",
-                help="LaTeX (.tex) gives the best ATS scores. PDF is also accepted. Max 10MB.",
+            _saved_latex = ""
+            if os.path.exists("data/resume/resume.tex"):
+                try:
+                    with open("data/resume/resume.tex", "r", encoding="utf-8") as _lf:
+                        _saved_latex = _lf.read()
+                except Exception:
+                    pass
+
+            latex_input = st.text_area(
+                "LaTeX code",
+                value=_saved_latex,
+                height=260,
+                placeholder=r"""\documentclass[11pt]{article}
+% Paste your full resume LaTeX code here
+\begin{document}
+...
+\end{document}""",
+                key="latex_paste_input",
+                label_visibility="collapsed",
             )
-            # Save on EVERY new/changed upload (detected by name+size) so a
-            # re-upload actually REPLACES the old resume. The previous guard
-            # (`not has_resume`) ignored new uploads when an old resume.pdf
-            # existed → profile showed the stale resume.
-            if resume_file is not None:
-                _sig = f"{resume_file.name}:{getattr(resume_file, 'size', 0)}"
-                if st.session_state.get("_uploaded_sig") != _sig:
-                    os.makedirs("data/resume", exist_ok=True)
-                    if resume_file.name.lower().endswith(".tex"):
-                        import tempfile as _tmpfile, subprocess as _sp, shutil as _sh
+
+            _latex_changed = latex_input.strip() and latex_input.strip() != _saved_latex.strip()
+            if st.button(
+                "⚡ Compile LaTeX & Use as Resume",
+                type="primary",
+                use_container_width=True,
+                disabled=not bool(latex_input and latex_input.strip()),
+                key="compile_latex_btn",
+            ):
+                if latex_input and latex_input.strip():
+                    import tempfile as _tmpfile, subprocess as _sp, shutil as _sh
+                    with st.spinner("Compiling with Tectonic…"):
                         with _tmpfile.TemporaryDirectory() as _td:
                             _tex = os.path.join(_td, "resume.tex")
-                            with open(_tex, "wb") as _f:
-                                _f.write(resume_file.getvalue())
+                            with open(_tex, "w", encoding="utf-8") as _f:
+                                _f.write(latex_input)
                             _r = _sp.run(
                                 ["tectonic", "--outdir", _td, _tex],
                                 capture_output=True, text=True, timeout=60,
                             )
                             _pdf = os.path.join(_td, "resume.pdf")
                             if _r.returncode == 0 and os.path.exists(_pdf):
+                                os.makedirs("data/resume", exist_ok=True)
                                 _sh.copy(_pdf, "data/resume/resume.pdf")
+                                with open("data/resume/resume.tex", "w", encoding="utf-8") as _f:
+                                    _f.write(latex_input)
+                                _sig = f"latex_paste:{len(latex_input)}"
+                                st.session_state["_uploaded_sig"] = _sig
+                                try:
+                                    from src.supabase_client import get_service_client, is_configured, get_owner_user_id
+                                    if is_configured():
+                                        _uid = st.session_state.get("user_id") or get_owner_user_id()
+                                        if _uid:
+                                            with open("data/resume/resume.pdf", "rb") as _rf:
+                                                get_service_client().storage.from_("resumes").upload(
+                                                    f"{_uid}/resume.pdf", _rf.read(),
+                                                    {"upsert": "true", "content-type": "application/pdf"},
+                                                )
+                                except Exception:
+                                    pass
+                                try:
+                                    if os.path.exists("data/resume/_parsed.json"):
+                                        os.remove("data/resume/_parsed.json")
+                                except Exception:
+                                    pass
+                                has_resume = True
+                                st.rerun()
                             else:
                                 st.error(
-                                    "LaTeX compilation failed. Check your .tex file.\n\n"
-                                    + (_r.stderr[-600:] or _r.stdout[-600:])
+                                    "LaTeX compilation failed. Check your code.\n\n"
+                                    + (_r.stderr[-800:] or _r.stdout[-800:])
                                 )
-                                st.stop()
-                    else:
-                        with open("data/resume/resume.pdf", "wb") as f:
-                            f.write(resume_file.getvalue())
+
+            # ── SECONDARY: PDF upload ─────────────────────────────────────────
+            st.html("""
+<div style="display:flex;align-items:center;gap:10px;margin:18px 0 10px">
+  <div style="flex:1;height:1px;background:#E2E8F0"></div>
+  <span style="font-size:0.8rem;color:#94A3B8;white-space:nowrap">or upload a PDF</span>
+  <div style="flex:1;height:1px;background:#E2E8F0"></div>
+</div>""")
+
+            resume_file = st.file_uploader(
+                "Upload PDF resume",
+                type=["pdf"], key="resume_upload",
+                label_visibility="collapsed",
+                help="Upload a PDF if you don't have a LaTeX source. Max 10MB.",
+            )
+            if resume_file is not None:
+                _sig = f"{resume_file.name}:{getattr(resume_file, 'size', 0)}"
+                if st.session_state.get("_uploaded_sig") != _sig:
+                    os.makedirs("data/resume", exist_ok=True)
+                    with open("data/resume/resume.pdf", "wb") as f:
+                        f.write(resume_file.getvalue())
                     st.session_state["_uploaded_sig"] = _sig
-                    # Persist to Supabase Storage so it survives HF Space restarts
                     try:
                         from src.supabase_client import get_service_client, is_configured, get_owner_user_id
                         if is_configured():
@@ -1360,8 +1415,6 @@ if show_config:
                                     )
                     except Exception:
                         pass
-                    # Invalidate the parsed-profile cache so it re-parses the
-                    # NEW file (cache is keyed by mtime+size, but delete to be safe)
                     try:
                         if os.path.exists("data/resume/_parsed.json"):
                             os.remove("data/resume/_parsed.json")
@@ -1370,17 +1423,18 @@ if show_config:
                     has_resume = True
                     st.rerun()
 
+            # ── Success / profile ─────────────────────────────────────────────
             if has_resume:
                 fsize = os.path.getsize("data/resume/resume.pdf") // 1024
-                _uploaded_name = st.session_state.get("_uploaded_sig", "resume").split(":")[0] or "resume.pdf"
+                _sig_raw = st.session_state.get("_uploaded_sig", "")
+                _src_label = "LaTeX source" if _sig_raw.startswith("latex_paste:") else (_sig_raw.split(":")[0] or "resume.pdf")
                 st.html(f"""
 <div class="micro-success">
-  ✅ <strong>{_uploaded_name}</strong> → resume.pdf ({fsize} KB) — Ready for AI matching
+  ✅ <strong>{_src_label}</strong> compiled → resume.pdf ({fsize} KB) — Ready for AI matching
 </div>""")
-                # ── Show the profile we built from THIS resume ──
                 _render_uploaded_profile()
             else:
-                st.caption("Upload your resume to unlock AI matching.")
+                st.caption("Paste your LaTeX or upload a PDF to unlock AI matching.")
 
         # ────────────────────────────────────────────────────────────────────
         # STEP 2: Target Roles