fix: replace broken <img> tags with markdown images on Universal Input page (#65)

The 4 auto-detection images were referenced via raw <img src> HTML tags
inside markdown tables. Astro's image pipeline doesn't process these,
so they resolved to 404s on the live site. Replaced with standard
markdown image syntax that Astro handles correctly.

Co-authored-by: Oz <oz-agent@warp.dev>

Author: petradonka

src/content/docs/terminal/input/universal-input.mdx

@@ -72,9 +72,15 @@ _Indicator_: Neither mode highlighted.
 
 When Warp detects an input type, the input switcher softly highlights the corresponding mode.
 
-| Agent (natural language) mode detected                                                          | Terminal (shell) mode detected                                                                 |
-| ----------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------- |
-| <img src="../../../../assets/terminal/auto-detection-agent-mode-1.png" alt="Universal Input auto-detecting a natural-language Agent prompt." data-size="original" /> | <img src="../../../../assets/terminal/auto-detection-terminal-mode.png" alt="Universal Input auto-detecting a shell command." data-size="original" /> |
+<figure>
+![Universal Input auto-detecting a natural-language Agent prompt.](../../../../assets/terminal/auto-detection-agent-mode-1.png)
+<figcaption>Agent (natural language) mode detected.</figcaption>
+</figure>
+
+<figure>
+![Universal Input auto-detecting a shell command.](../../../../assets/terminal/auto-detection-terminal-mode.png)
+<figcaption>Terminal (shell) mode detected.</figcaption>
+</figure>
 
 :::note
 The model Warp uses to detect natural language automatically is completely local.
@@ -89,9 +95,15 @@ By default, auto-detection is enabled. This means Warp decides whether to treat
   * `CMD+I` (macOS)
   * `CTRL+I` (Windows/Linux)
 
-| Agent (natural language) mode enabled                                                              | Terminal (shell) mode enabled                                                                   |
-| -------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------- |
-| <img src="../../../../assets/terminal/auto-detection-off-terminal-mode.png" alt="" data-size="original" /> | <img src="../../../../assets/terminal/auto-detection-off-agent-mode.png" alt="" data-size="original" /> |
+<figure>
+![Universal Input with auto-detection off in Agent Mode.](../../../../assets/terminal/auto-detection-off-agent-mode.png)
+<figcaption>Agent (natural language) mode enabled.</figcaption>
+</figure>
+
+<figure>
+![Universal Input with auto-detection off in Terminal Mode.](../../../../assets/terminal/auto-detection-off-terminal-mode.png)
+<figcaption>Terminal (shell) mode enabled.</figcaption>
+</figure>
 
 ### Entering Agent Mode