Refactor upload modal for generic storage and read-only config

- Updates Upload Modal UI labels to be provider-agnostic (e.g., 'Storage Credentials', 'Endpoint').
- Implements a read-only 'Summary View' for configured storage connections, collapsing the editable form by default.
- Adds 'Manage Storage' button that navigates to the Profile Modal's storage pane.
- Updates `initUploadModal.js` to inject the navigation callback.
- Updates `r2Service.js` status messages to be generic.
- Fixes unlock flow to ensure UI updates after storage unlock.

verification/verify_static_html.py

@@ -0,0 +1,45 @@
+
+from playwright.sync_api import sync_playwright
+
+def run():
+    with sync_playwright() as p:
+        browser = p.chromium.launch(headless=True)
+        page = browser.new_page()
+
+        # Load the HTML template file directly by fetching it and injecting it
+        # effectively unit-testing the template structure in a browser
+        page.goto("http://localhost:8080")
+
+        # Inject the modal HTML manually to verify the static changes
+        page.evaluate("""async () => {
+            const response = await fetch("/components/upload-modal.html");
+            const html = await response.text();
+            document.body.innerHTML = html;
+            document.getElementById("uploadModal").classList.remove("hidden");
+            document.getElementById("section-storage-settings").classList.remove("hidden");
+        }""")
+
+        # Wait for rendering
+        page.wait_for_selector("#uploadModal", state="visible")
+
+        # Check text
+        button_text = page.inner_text("#btn-storage-settings")
+        print(f"Button Text: {button_text}")
+
+        content = page.content()
+        if "Storage Configuration" in button_text:
+            print("Verified: Button text updated.")
+
+        if "Account ID / Endpoint" in content:
+             print("Verified: Account label updated.")
+
+        if "Public URL" in content:
+             print("Verified: Public URL label updated.")
+
+        page.screenshot(path="verification/upload_modal_static.png")
+        print("Screenshot saved to verification/upload_modal_static.png")
+
+        browser.close()
+
+if __name__ == "__main__":
+    run()